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fn6202 rev.4.00 page 1 of 32 mar 24, 2017 fn6202 rev.4.00 mar 24, 2017 ISL81334, isl41334 15kv esd protected, two port, dual protocol transceivers datasheet the ISL81334 and isl41334 are two-port interface ics in which each port can be independ ently configured as a single rs-485, rs-422 transceiver, or as a dual (2 tx, 2 rx) rs-232 transceiver. with both ports set to the same mode, two rs-485, rs-422 transceivers, or four rs-232 transceivers are available. if either port is in rs-232 mode, the onboard charge pump generates rs-232 compliant 5v tx output levels from a single v cc supply as low as 4.5v. four small 0.1f capacitors are required for the charge pump . the transceivers are rs-232 compliant, with the rx inputs handling up to 25v, and the tx outputs handling 12v. in rs-485 mode, the transceivers support both the rs-485 and rs-422 differential co mmunication standards. the receivers feature ?full fail-safe? operation, so the rx outputs remain in a high state if the inputs are open or shorted together. the transmitters support up to three data rates, two of which are slew rate limited for problem-free communications. the charge pump disables when both ports are in rs-485 mode, thereby savi ng power, minimizing noise, and eliminating the char ge pump capacitors. both rs-232 and rs-485 modes feature loopback and shutdown functions. loopback internally connects the tx outputs to the corresponding rx input, to facilitate board level self-test implementation. the outputs remain connected to the loads during loopback, so connection problems (such as shorted connectors or cables) can be detected. shutdown mode disables the tx and rx outputs, disables the charge pumps, and places the ic in a low current (a) mode. the isl41334 is a qfn packaged device that includes two additional user select able, lower speed, and edge rate options for emi-sensitive designs, or to allow longer bus lengths. it also features a logic supply pin (v l ) that sets the v oh level of logic outputs, and the switching poin ts of logic inputs, to be compatible with another supp ly voltage in mixed voltage systems. the qfn also adds active low rx enable pins to increase design flexibility, allowing tx/rx direction control, through a single signal pe r port, by connecting the corresponding de and rxen pins together. for a single port version of these devices, please see the isl81387, isl41387 datasheet. features ? 15kv (hbm) esd protected bus pins (rs-232 or rs-485) ? two independent ports, each user selectable for rs-232 (2 transceivers) or rs-485, rs-422 (1 transceiver) ? single 5v (10% tolerance) supply ? flow-through pinouts simplify board layouts ? pb-free (rohs compliant) ? large (2.7v) differential v out for improved noise immunity in rs-485, rs-422 networks ? full fail-safe (open/short) rx in rs-485, rs-422 mode ? loopback mode facilitates board self-test functions ? user selectable rs-485 data rates (isl41334 only) - fast speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mbps - slew rate limited . . . . . . . . . . . . . . . . . . . . . . . . . . . 460kbps - slew rate limited . . . . . . . . . . . . . . . . . . . . . . . . . . . 115kbps ? fast rs-232 data rate . . . . . . . . . . . . . . . . . . . . up to 650kbps ? low current shutdown mode . . . . . . . . . . . . . . . . . . . . . . 42a ? qfn package saves board space (isl41334 only) ? logic supply pin (v l ) eases operation in mixed supply systems (isl41334 only) applications ? gaming applications (such as, slot machines) ? single board computers ?factory automation ?security networks ? industrial/process control networks ? level translators, such as rs-232 to rs-422 ? point of sale equipment ? dual channel rs-485 interfaces related literature ? for a full list of related documents, visit our website - ISL81334 , isl41334 product pages
ISL81334, isl41334 fn6202 rev.4.00 page 2 of 32 mar 24, 2017 table of contents ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 pin configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 pin descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 ISL81334 truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 isl41334 truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 typical operating circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 thermal information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 test circuits and waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 rs-232 to rs-485 converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 ISL81334 and isl41334 advantages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 rs-232 mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 rx features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 tx features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 charge pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 data rates and cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 rs-485 mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 rx features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 tx features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 speed options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 data rate, cables, and terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 high esd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 small packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 flow through pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 low power shutdown (shdn) mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 internal loopback mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 isl41334 (qfn package) special features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 logic supply (vl pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 active low rx enable (rxen) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 rs-485 slew rate limited data rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 typical performance curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 die characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 about intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 package outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 l40.6x6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 m28.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 m28.209 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
ISL81334, isl41334 fn6202 rev.4.00 page 3 of 32 mar 24, 2017 table 1. summary of features part number no. of ports package options rs-485 data rate (bps) rs-232 data rate (kbps) v l pin? active h or l rx enable? low power shutdown? ISL81334 2 28 ld soic, 28 ld ssop 20m 650 no none yes isl41334 2 40 ld qfn (6mmx6mm) 20m, 460k, 115k 650 yes l yes ordering information part number ( notes 2 , 3 ) part marking temp. range (c) tape and reel (units) ( note 1 ) package (rohs compliant) pkg. dwg. # ISL81334iaz 81334 iaz -40 to +85 - 28 ld ssop m28.209 ISL81334iaz-t 81334 iaz -40 to +85 1k 28 ld ssop m28.209 ISL81334ibz ISL81334ibz -40 to +85 - 28 ld soic m28.3 ISL81334ibz-t ISL81334ibz -40 to +85 1k 28 ld soic m28.3 isl41334irz 41334 irz -40 to +85 - 40 ld qfn l40.6x6 isl41334irz-t 41334 irz -40 to +85 4k 40 ld qfn l40.6x6 isl41334irz-t7a 41334 irz -40 to +85 250 40 ld qfn l40.6x6 isl41334eval1z evaluation board notes: 1. refer to tb347 for details on reel specifications. 2. these intersil pb-free plastic packaged products employ spec ial pb-free material sets, molding compounds/die attach materials , and 100% matte tin plate plus anneal (e3 termination finish , which is rohs compliant and compatible wi th both snpb and pb-free soldering opera tions). intersil pb-free products are msl classified at pb-fr ee peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jed ec j std-020. 3. for moisture sensitivity level (msl), see product information page for ISL81334 , isl41334 . for more information on msl, see tech brief tb363 .
ISL81334, isl41334 fn6202 rev.4.00 page 4 of 32 mar 24, 2017 pin configurations ISL81334 (28 ld soic, 28 ld ssop) top view isl41334 (40 ld qfn) top view c1+ c1- v+ a1 b1 y1 z1 sel1 sel2 z2 y2 b2 a2 gnd c2+ v cc r b1 r a1 d z1 /de1 lb d y2 d z2 /de2 r a2 r b2 v- c2- d y1 on/off 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 40 2 3 4 5 6 7 8 9 10 30 29 28 27 26 25 24 23 22 21 39 38 37 36 35 34 33 32 31 11 12 13 14 15 16 17 18 19 20 nc nc nc c1- c1+ c2+ c2- v cc nc v l r b1 r a1 d z1 /de 1 d y1 lb d z2 /de 2 r a2 v+ a1 b1 y1 z1 sel1 sel2 z2 y2 b2 spa a2 rxen1 gnd spb gnd nc rxen2 v- nc on/off r b2 d y2 pin descriptions pin mode function gnd both ground connection. lb both loopback mode. in the ISL81334, loopback mode is enabled when lb is low. in the isl41334, loopback mode is enabled when lb and rxen are low. nc both no connection. on/off both if either port is in rs-232 mode, a low on on/off disables the charge pumps. in either mode, a low disables all the outputs, and places the device in low power shutdown. intern ally pulled-high. on = 1 for normal operation. rxen1 rxen2 both active low receiver output enable. rx is enabled when rxen is low; rx is high impedance when rxen is high. internally pulled low. (qfn only) selx both interface mode select input. high puts correspondin g port in rs-485 mode, while a low puts it in rs-232 mode. v cc both system power supply input (5v). v l both logic-level supply. all ttl/cmos inputs and outputs are powere d by this supply. qfn logic input pins that are externally ti ed high in the application should use the v l supply for the high voltage level. (qfn only) ax rs-232 receiver input with 15kv esd protection. a low on ax forces r ax high; a high on ax forces r ax low. rs-485 inverting receiver input with 15kv esd protection. bx rs-232 receiver input with 15kv esd protection. a low on bx forces r b high; a high on bx forces r bx low. rs-485 noninverting receiver input with 15kv esd protection. d yx rs-232 driver input. a low on d yx forces output yx high. similarly, a high on d yx forces output yx low. rs-485 driver input. a low on d yx forces output yx high and output z low. similarly, a high on d y forces output yx low and output zx high. d zx rs-232 driver input. a low on d zx forces output zx high. similarly, a high on d z forces output zx low.
ISL81334, isl41334 fn6202 rev.4.00 page 5 of 32 mar 24, 2017 dex rs-485 driver output enable. the driver outputs, yx and zx, are enabled by bringing de high. they are high impedance when de is low. internally pulled high when po rt selected for rs-485 mode. r ax rs-232 receiver output. rs-485 receiver output: if bx > ax by at least -40mv, r ax is high; if bx < ax by -200mv or more, r ax is low; r ax = high if ax and bx are unconnected (floating) or shorte d together (i.e., full fail-safe). r bx rs-232 receiver output. rs-485 not used. internally pulled-high, and unaffected by rxen . yx rs-232 driver output with 15kv esd protection. rs-485 inverting driver output with 15kv esd protection. zx rs-232 driver output with 15kv esd protection. rs-485 noninverting driver output with 15kv esd protection. spx rs-485 speed control. internally pulled-high. (qfn only) c1+ rs-232 external capacitor (voltage doubler) is connected to this lead. not needed if both ports in rs-485 mode. c1- rs-232 external capacitor (voltage doubler) is connected to this lead. not needed if both ports in rs-485 mode. c2+ rs-232 external capacitor (voltage inverter) is connected to this lead. not needed if both ports in rs-485 mode. c2- rs-232 external capacitor (voltage inverter) is connected to this lead. not needed if both ports in rs-485 mode. v+ rs-232 internally generated positive rs-232 transmitter suppl y (+5.5v). c3 not needed if both ports in rs-485 mode. v- rs-232 internally generated negative rs-232 transmitter supp ly (-5.5v). c4 not needed if both ports in rs-485 mode. pin descriptions pin mode function
ISL81334, isl41334 fn6202 rev.4.00 page 6 of 32 mar 24, 2017 table 2. ISL81334 function table inputs receiver outputs driver outputs charge pumps ( note 4 )mode sel1 or 2 on/off de1 or 2 r ax r bx yx zx 0 1 n.a. on on on on on rs-232 x 0 x high-z high-z high-z high-z off shutdown 110onhigh-z ( note 5 ) high-z high-z off rs-485 111onhigh-z ( note 5 ) on on off rs-485 note: 4. charge pumps are off if sel1 = sel2 = 1, or if on/off = 0. if on = 1, and either port is programme d for rs-232 mode, then the charge pumps are on. 5. internally pulled high through a 40k resistor. ISL81334 truth tables (for each port) rs-232 transmitting mode inputs outputs sel1 or 2 on/off d yx d zx yx zx 010011 010110 011001 011100 0 0 x x high-z high-z rs-232 receiving mode inputs output sel1 or 2 on/off ax bx r ax r bx 010011 010110 011001 011100 0 1 open open 1 1 0 0 x x high-z high-z rs-485 transmitting mode inputs outputs sel1 or 2 on/off de1 or 2 d yx yx zx 111010 111101 1 1 0 x high-z high-z 1 0 x x high-z high-z rs-485 receiving mode inputs output sel1 or 2 on/off bx-ax r ax r bx ( note 6 ) 11 ? -40mv 1 high-z 11 ? -200mv 0 high-z 1 1 open or shorted together 1 high-z 1 0 x high-z high-z note: 6. internally pulled high through a 40k resistor.
ISL81334, isl41334 fn6202 rev.4.00 page 7 of 32 mar 24, 2017 table 3. isl41334 function table inputs receiver outputs driver outputs charge pumps ( note 7 ) driver data rate (mbps) mode sel1 or 2 on/off spa spb rxen 1 or 2 de1 or 2 r ax r bx yx zx 01xx 0n.a.ononononon0.46rs-232 0 1 x x 1 n.a. high-z high-z on on on 0.46 rs-232 x 0 x x x x high-z high-z high-z high-z off n.a. shutdown 11xx 0 0onhigh-z ( note 8 ) high-z high-z off n.a. rs-485 110001onhigh-z ( note 8 ) on on off 0.46 rs-485 110101onhigh-z ( note 8 ) on on off 0.115 rs-485 111001onhigh-z ( note 8 ) on on off 20 rs-485 111101onhigh-z ( note 8 ) on on off 20 rs-485 1 1 x x 1 0 high-z high-z ( note 8 ) high-z high-z off n.a. rs-485 1 1 0 0 1 1 high-z high-z ( note 8 ) on on off 0.46 rs-485 1 1 0 1 1 1 high-z high-z ( note 8 ) on on off 0.115 rs-485 1 1 1 0 1 1 high-z high-z ( note 8 ) on on off 20 rs-485 1 1 1 1 1 1 high-z high-z ( note 8 ) on on off 20 rs-485 note: 7. charge pumps are off if sel1 = sel2 = 1, or if on/off = 0. if on = 1, and either port is programm ed for rs-232 mode, then the charge pumps are on. 8. internally pulled high through a 40k resistor. isl41334 truth tables (for each port) rs-232 transmitting mode inputs outputs sel1 or 2 on/off d yx d zx yx zx 0 10011 0 10110 0 11001 0 11100 0 0 x x high-z high-z rs-232 receiving mode inputs output sel1 or 2 on/off rxen 1 or 2 ax bx r ax r bx 0 1 00011 0 1 00110 0 1 01001 0 1 01100 0 1 0 open open 1 1 011xxhigh-zhigh-z 0 0 x x x high-z high-z rs-485 transmitting mode inputs outputs data rate (mbps) sel1 or 2 on/ off de1 or 2spaspbd yx yx zx 1 1 1 0 0 0/1 1/0 0/1 0.46 1 1 1 0 1 0/1 1/0 0/1 0.115 1 1 1 1 x 0/1 1/0 0/1 20 1 1 0 x x x high-z high-z n.a. 1 0 x x x x high-z high-z n.a. rs-485 receiving mode inputs output sel1 or 2 on/off rxen 1 or 2 bx-ax r ax r bx ( note 9 ) 110 -40mv 1 high-z 110 -200mv 0 high-z 1 1 0 open or shorted together 1high-z 1 1 1 x high-z high-z 1 0 x x high-z high-z note: 9. internally pulled high through a 40k resistor.
ISL81334, isl41334 fn6202 rev.4.00 page 8 of 32 mar 24, 2017 typical operating circuits figure 1. rs-232 mode without loopback figure 2. rs-232 mode with loopback figure 3. rs-485 mode without loopba ck figure 4. rs-485 mode with loopback 15 14 28 27 26 (9) 8 1 2 3 c1+ c1- v+ v- gnd c2+ c2- vcc selx v cc 0.1f 0.1f 0.1f ISL81334 25 (16) 24 (17) (13) 4 ax rbx rax (12) 5 bx 5k 5k lb on/off 21 20 high high 22 (19) (11) 6 yx dyx 23 (18) (10) 7 zx dzx 0.1f 0.1f note: pinout f or soic and ssop same for port 2. red pin numbers = port 1 , blue pin numbers = port 2 15 14 28 27 26 (9) 8 1 2 3 c1+ c1- v+ v- gnd c2+ c2- vcc selx v cc 0.1f 0.1f 0.1f ISL81334 25 (16) 24 (17) (13) 4 ax rbx rax (12) 5 bx lb on/off 21 20 low high 22 (19) (11) 6 yx dyx 23 (18) (10) 7 zx dzx 0.1f 0.1f note: pinout f or soic and ssop same for port 2. note: pinout f or soic and ssop same for port 2. 15 14 28 27 26 (9) 8 1 2 3 c1+ c1- v+ v- gnd c2+ c2- vcc selx v cc 0.1f 0.1f 0.1f ISL81334 24 (17) (13) 4 ax rax (12) 5 bx (11) 6 yx dyx (10) 7 zx 0.1f 0.1f 22 (19) rbx 25 (16) 23 (18) dex lb on/off 21 20 high high v cc d r note: pinout for soic and ssop same for port 2. 15 14 28 27 26 (9) 8 1 2 3 c1+ c1- v+ v- gnd c2+ c2- vcc selx v cc 0.1f 0.1f 0.1f ISL81334 24 (17) (13) 4 ax rax (12) 5 bx (11) 6 yx dyx (10) 7 zx 0.1f 0.1f 22 (19) rbx 25 (16) 23 (18) dex lb on/off 21 20 low high v cc d b
ISL81334, isl41334 fn6202 rev.4.00 page 9 of 32 mar 24, 2017 figure 5. rs-232 mode without loopback figure 6. rs-232 mode with loopback figure 7. rs-485 mode without loopba ck figure 8. rs-485 mode with loopback typical operating circuits (continued) note: pinout for soic and ssop same for port 2. red pin numbers = port 1 , blue pin numbers = port 2 19 15,16 36 35 34 (7) 6 37 38 1 c1+ c1- v+ v- gnd c2+ c2- vcc selx 0.1f 0.1f 0.1f isl41334 (11) 2 ax (10) 3 bx (9) 4 (8) 5 0.1f 0.1f lb on/off 26 25 high high 31 vl v l 0.1f v cc 13 spa 14 spb yx zx dzx 28 (23) dyx 27 (24) rbx 30 (21) 17 (18) rxenx 29 (22) rax 5k 5k 19 15,16 36 35 34 (7) 6 37 38 1 c1+ c1- v+ v- gnd c2+ c2- vcc selx 0.1f 0.1f 0.1f isl41334 (11) 2 ax (10) 3 bx (9) 4 yx (8) 5 zx 0.1f 0.1f 17 (18) lb on/off 26 25 low high rxenx 31 vl v l 0.1f v cc 13 spa 14 spb low dzx 28 (23) dyx 27 (24) rbx 30 (21) 29 (22) rax note: pinout for soic and ssop same for port 2. note: pinout for soic and ssop same for port 2. 19 15,16 36 35 34 (7) 6 37 38 1 c1+ c1- v+ v- gnd c2+ c2- vcc selx 0.1f 0.1f 0.1f isl41334 29 (22) (11) 2 ax rax (10) 3 bx (9) 4 (8) 5 0.1f 0.1f rbx 17 (18) dex lb on/off 26 25 high high v cc r rxenx 30 (21) 31 vl v l 0.1f v cc 13 spa 14 spb yx dyx zx 27 (24) 28 (23) d note: pinout for soic and ssop same for port 2. b 19 15,16 36 35 34 (7) 6 37 38 1 c1+ c1- v+ v- gnd c2+ c2- vcc sel x 0.1f 0.1f 0.1f isl41334 29 (22) (11) 2 a x rax (10) 3 b x (9) 4 y x (8) 5 z x 0.1f 0.1f rbx 17 (18) dex lb on/off 26 25 low high vc c rxenx 30 (21) 31 vl v l 0.1f v cc 13 spa 14 spb low dyx 27 (24) 28 (23) d
ISL81334, isl41334 fn6202 rev.4.00 page 10 of 32 mar 24, 2017 absolute maximum ratings (t a = +25c) thermal information v cc to ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7v v l (qfn only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to v cc + 0.5v input voltages all except ax, bx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to 7v input/output voltages ax, bx (any mode). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25v to +25v yx, zx (any mode, note 10 ) . . . . . . . . . . . . . . . . . . . . . . -12.5v to +12.5v r ax , r bx (non-qfn package) . . . . . . . . . . . . . . . . . -0.5v to (v cc + 0.5v) r ax , r bx (qfn package) . . . . . . . . . . . . . . . . . . . . . . . -0.5v to (v l + 0.5v) output short-circuit duration yx, zx, r ax , r bx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . indefinite esd rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see specification table thermal resistance ? ja (c/w) 28 ld soic package ( note 12 ) . . . . . . . . . . . . . . . . . . . . 65 28 ld ssop package ( note 12 ) . . . . . . . . . . . . . . . . . . . 60 40 ld qfn package ( note 11 ) . . . . . . . . . . . . . . . . . . . . 32 maximum junction temperature (plastic package) . . . . . . . . . . . +150c maximum storage temperature range . . . . . . . . . . . . . .-65c to +150c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see tb493 operating conditions temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40c to +85c caution: do not operate at or near the maximum ratings listed for extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. notes: 10. one output at a time, i out 100ma for 10 mins. 11. ? ja is measured in free air with the component mounted on a high-e ffective thermal conductivity te st board with ?direct attach? fe atures. see tech brief tb379 . 12. ? ja is measured with the component mounted on a high-effective thermal conductivity test board in free air. see tech brief tb379 for details. electrical specifications test conditions: v cc = 4.5v to 5.5v, c 1 - c 4 = 0.1f, v l = v cc (for qfn only); unless otherwise specified. typicals are at v cc = 5v, t a = +25c ( note 13 ). parameter symbol test conditions temp (c) min ( note 18 )typ max ( note 18 )unit dc characteristics - rs-485 driver (selx = v cc ) driver differential v out (no load) v od1 full - - v cc v driver differential v out (with load) v od2 r = 50 (rs-422) ( figure 9 ) full 2.5 3.1 - v r = 27 (rs-485) ( figure 9 ) full 2.2 2.7 5 v v od3 r d = 60 , r = 375 , v cm = -7v to 12v ( figure 9 ) full 2 2.7 5 v change in magnitude of driver differential v out for complementary output states ? v od r = 27 or 50 ( figure 9 ) full - 0.01 0.2 v driver common-mode v out v oc r = 27 or 50 ( figure 9 ) ( note 17 )full--3.1v change in magnitude of driver common-mode v out for complementary output states ? v oc r = 27 or 50 (figure 9) ( note 17 ) full - 0.01 0.2 v driver short-circuit current, v out = high or low i os -7v (v y or v z ) 12v ( note 15 ) full 35 - 250 ma driver three-state output leakage current (yx, zx) i oz outputs disabled, v cc = 0v or 5.5v v out = 12v full - - 500 a v out = -7v full -200 - - a dc characteristics - rs-232 driver (selx = gnd) driver output voltage swing v o all t outs loaded with 3k to ground full 5.0 +6/-7 - v driver output short-circuit current i os v out = 0v full -60 25/-35 60 ma dc characteristics - logic pins (suc h as driver and control input pins) input high voltage v ih1 v l = v cc if qfn full 2 1.6 - v v ih2 v l = 3.3v (qfn only) full 2 1.2 - v v ih3 v l = 2.5v (qfn only) full 1.5 1 - v
ISL81334, isl41334 fn6202 rev.4.00 page 11 of 32 mar 24, 2017 input low voltage v il1 v l = v cc if qfn full - 1.4 0.8 v v il2 v l = 3.3v (qfn only) full - 1 0.7 v v il3 v l = 2.5v (qfn only) full - - 0.5 v input current i in1 pins without pull-ups or pull-downs full -2 - 2 a i in2 lb , on/off , dex, spx (qfn), rxenx (qfn) full -25 - 25 a dc characteristics - rs-485 receiver inputs (selx = v cc ) receiver differential threshold voltage v th -7v ? v cm ? 12v, full fail-safe full -0.2 - -0.04 v receiver input hysteresis ? v th v cm = 0v 25 - 35 - mv receiver input current (ax, bx) i in v cc = 0v or 4.5 to 5.5v v in = 12v full - - 0.8 ma v in = -7v full -0.64 - - ma receiver input resistance r in -7v v cm 12v, v cc = 0 ( note 16 ) or 4.5v v cc 5.5v full 15 - - k dc characteristics - rs-232 receiver inputs (selx = gnd) receiver input voltage range vin full -25 - 25 v receiver input threshold v il full - 1.4 0.8 v v ih full 2.4 1.9 - v receiver input hysteresis ? v th 25 - 0.5 - v receiver input resistance r in v in = 15v, v cc powered up ( note 16 )full357k dc characteristics - receiver outputs (485 or 232 mode) receiver output high voltage v oh1 i o = -2ma (v l = v cc if qfn) full 3.5 4.6 - v v oh2 i o = -650a, v l = 3v (qfn only) full 2.6 2.9 - v v oh3 i o = -500a, v l = 2.5v (qfn only) full 2 2.4 - v receiver output low voltage v ol i o = 3ma full - 0.1 0.4 v receiver short-circuit current i osr 0v v o v cc full 7 - 85 ma receiver three-state output current i ozr output disabled, 0v v o v cc (or v l for qfn) full - - 10 a unused receiver (r bx ) pull-up resistance r obz on/off = v cc , selx = v cc (rs-485 mode) 25 - 40 - k power supply characteristics no-load supply current (note 14) i cc232 sel1 or sel2 = gnd, lb = on/off = v cc full - 3.7 7 ma i cc485 sel1 and 2 = lb = de = on/off = v cc full - 1.6 5 ma shutdown supply current i shdn232 on/off = selx = gnd, lb = v cc , (spx = v cc if qfn) full - 25 50 a i shdn485 on/off = dex = gnd, selx = lb = v cc , (spx = gnd if qfn) soic/ssop full - 42 80 a qfn full - 80 160 a esd characteristics bus pins (ax, bx, yx, zx) any mode human body model 25 - 15 - kv all other pins human body model 25 - 4 - kv electrical specifications test conditions: v cc = 4.5v to 5.5v, c 1 - c 4 = 0.1f, v l = v cc (for qfn only); unless otherwise specified. typicals are at v cc = 5v, t a = +25c ( note 13 ). (continued) parameter symbol test conditions temp (c) min ( note 18 )typ max ( note 18 )unit
ISL81334, isl41334 fn6202 rev.4.00 page 12 of 32 mar 24, 2017 rs-232 driver and receiver switching characteri stics (selx = gnd, all versions and speeds) driver output transition region slew rate sr r l =3k , measured from 3v to -3v or -3v to 3v c l 15pf full - 18 30 v/s c l ? 2500pf full 4 12 - v/s driver output transition time t r , t f r l =3k , c l = 2500pf, 10% to 90% full 0.22 1.2 3.1 s driver propagation delay t dphl r l =3k , c l = 1000pf ( figure 14 )full-12s t dplh full - 1.2 2 s driver propagation delay skew t dskew t dphl - t dplh ( figure 14 ) full - 240 400 ns driver enable time from shutdown t densd v out = 3.0v 25 - 20 - s driver maximum data rate dr d r l =3k , c l = 1000pf, one transmitter switching per port full 460 650 - kbps receiver propagation delay t rphl c l = 15pf ( figure 15 ) full - 50 120 ns t rplh full - 40 120 ns receiver propagation delay skew t rskew t rphl - t rplh ( figure 15 )full-1040ns receiver maximum data rate dr r c l = 15pf full 0.46 2 - mbps rs-485 driver switching characteristics (fast data rate (20mbps), selx = v cc , all versions (spa = v cc if qfn)) driver differential input to output delay t dlh , t dhl r diff = 54 , c l = 100pf ( figure 10 )full153050ns driver output skew t skew r diff = 54 , c l = 100pf ( figure 10 )full-310ns driver differential rise or fall time t r , t f r diff = 54 , c l = 100pf ( figure 10 ) full 3 11 20 ns driver enable to output low t zl c l = 100pf, sw = v cc ( figure 11 )full-2760ns driver enable to output high t zh c l = 100pf, sw = gnd ( figure 11 )full-2460ns driver disable from output low t lz c l = 15pf, sw = v cc ( figure 11 )full-3160ns driver disable from output high t hz c l = 15pf, sw = gnd ( figure 11 )full-2460ns driver enable from shutdown to output low t zl(shdn) r l = 500 , c l = 100pf, sw = v cc ( figure 11 ) full - 65 250 ns driver enable from shutdown to output high t zh(shdn) r l = 500 , c l = 100pf, sw = gnd ( figure 11 ) full - 152 250 ns driver maximum data rate f max r diff = 54 , c l = 100pf ( figure 10 ) full - 30 - mbps rs-485 driver switching characteristics (medium data rate (460kbps, qfn only), selx = v cc , spa = spb = gnd) driver differential input to output delay t dlh , t dhl r diff = 54 , c l = 100pf ( figure 10 ) full 200 490 1000 ns driver output skew t skew r diff = 54 , c l = 100pf ( figure 10 ) full - 110 400 ns driver differential rise or fall time t r , t f r diff = 54 , c l = 100pf ( figure 10 ) full 300 600 1100 ns driver enable to output low t zl c l = 100pf, sw = v cc ( figure 11 ) full - 30 300 ns driver enable to output high t zh c l = 100pf, sw = gnd ( figure 11 ) full - 128 300 ns driver disable from output low t lz c l = 15pf, sw = v cc ( figure 11 )full-3160ns driver disable from output high t hz c l = 15pf, sw = gnd ( figure 11 )full-2460ns driver enable from shutdown to output low t zl(shdn) r l = 500 , c l = 100pf, sw = v cc ( figure 11 ) full - 65 500 ns driver enable from shutdown to output high t zh(shdn) r l = 500 , c l = 100pf, sw = gnd ( figure 11 ) full - 255 500 ns electrical specifications test conditions: v cc = 4.5v to 5.5v, c 1 - c 4 = 0.1f, v l = v cc (for qfn only); unless otherwise specified. typicals are at v cc = 5v, t a = +25c ( note 13 ). (continued) parameter symbol test conditions temp (c) min ( note 18 )typ max ( note 18 )unit
ISL81334, isl41334 fn6202 rev.4.00 page 13 of 32 mar 24, 2017 driver maximum data rate f max r diff = 54 , c l = 100pf ( figure 10 ) full - 2000 - kbps rs-485 driver switching characteristics (slow data rate (115kbps, qfn only), selx = v cc , spa = gnd, spb = v cc ) driver differential input to output delay t dlh , t dhl r diff = 54 , c l = 100pf ( figure 10 ) full 800 1500 2500 ns driver output skew t skew r diff = 54 , c l = 100pf ( figure 10 ) full - 350 1250 ns driver differential rise or fall time t r , t f r diff = 54 , c l = 100pf ( figure 10 ) full 1000 2000 3100 ns driver enable to output low t zl c l = 100pf, sw = v cc ( figure 11 ) full - 32 600 ns driver enable to output high t zh c l = 100pf, sw = gnd ( figure 11 ) full - 300 600 ns driver disable from output low t lz c l = 15pf, sw = v cc ( figure 11 )full-3160ns driver disable from output high t hz c l = 15pf, sw = gnd ( figure 11 )full-2460ns driver enable from shutdown to output low t zl(shdn) r l = 500 , c l = 100pf, sw = v cc ( figure 11 ) full - 65 800 ns driver enable from shutdown to output high t zh(shdn) r l = 500 c l = 100pf, sw = gnd ( figure 11 ) full - 420 800 ns driver maximum data rate f max r diff = 54 , c l = 100pf ( figure 10 ) full - 800 - kbps rs-485 receiver switching characteristics (selx = v cc , all versions and speeds) receiver input to output delay t plh , t phl ( figure 12 )full205090ns receiver skew | t plh - t phl |t skew ( figure 12 ) full - 0.1 10 ns receiver maximum data rate f max full - 40 - mbps receiver enable/disable characteristics (all modes and speeds) receiver enable to output low t zl qfn only, c l = 15pf, sw = v cc ( figure 13 ) full - 22 60 ns receiver enable to output high t zh qfn only, c l = 15pf, sw = gnd ( figure 13 ) full - 23 60 ns receiver disable from output low t lz qfn only, c l = 15pf, sw = v cc ( figure 13 )full-2460ns receiver disable from output high t hz qfn only, c l = 15pf, sw = gnd ( figure 13 ) full - 25 60 ns receiver enable from shutdown to output low t zlshdn c l = 15pf, sw = v cc ( figure 13 ) rs-485 mode full - 260 700 ns rs-232 mode 25 - 35 - ns receiver enable from shutdown to output high t zhshdn c l = 15pf, sw = gnd ( figure 13 ) rs-485 mode full - 260 700 ns rs-232 mode 25 - 25 - ns notes: 13. all currents into device pins are positi ve; all currents out of device pins are negative. all voltages are referenced to dev ice ground unless otherwise specified. 14. supply current specification is valid for lo aded drivers when de = 0v (rs-485 mode only). 15. applies to peak current. see ?typical performance curves? starting on 22 for more information. 16. r in defaults to rs-485 mode (>15k ) when the device is unpowered (v cc = 0v), or in shdn, regardless of the state of the selx inputs. 17. v cc 5.25v. 18. parts are 100% tested at +25c. over-temperature limits es tablished by characterization and are not production tested. electrical specifications test conditions: v cc = 4.5v to 5.5v, c 1 - c 4 = 0.1f, v l = v cc (for qfn only); unless otherwise specified. typicals are at v cc = 5v, t a = +25c ( note 13 ). (continued) parameter symbol test conditions temp (c) min ( note 18 )typ max ( note 18 )unit
ISL81334, isl41334 fn6202 rev.4.00 page 14 of 32 mar 24, 2017 test circuits and waveforms figure 9. rs-485 driver v od and v oc test circuit figure 10a. test circuit fig ure 10b. measurement points figure 10. rs-485 driver propagation de lay and differential transition times d de d y v cc v od v oc r r y z r d d de d y v cc signal generator c l = 100pf r diff y z c l = 100pf out (z) 3v 0v t plh 1.5v 1.5v v oh v ol 50% 50% t phl out (y) t phl v oh v ol 50% 50% t plh diff out (z - y) t r +v od -v od 90% 90% t f 10% 10% d y skew = |t plh (y or z) - t phl (z or y)| 0v 0v t dhl t dlh
ISL81334, isl41334 fn6202 rev.4.00 page 15 of 32 mar 24, 2017 figure 11a. test circuit figure 11b. measurement points figure 11. rs-485 driver enable and disable times figure 12a. test circuit figure 12b. measurement points figure 12. rs-485 receiver propagation delay figure 13a. test circuit figure 13b. measurement points figure 13. rs-485 receiver enable and disable times test circuits and waveforms (continued) d de dy c l 500 y z v cc gnd sw for shdn tests, switch on/off rather than de parameter on/de output dy sw c l (pf) t hz 1/- y/z 0/1 gnd 15 t lz 1/- y/z 1/0 v cc 15 t zh 1/- y/z 0/1 gnd 100 t zl 1/- y/z 1/0 v cc 100 t zh(shdn) -/1 y/z 0/1 gnd 100 t zl(shdn) -/1 y/z 1/0 v cc 100 signal generator out (y, z) 3v 0v 1.5v 1.5v v oh 0v 2.3v v oh - 0.5v t hz out (y, z) v cc v ol 2.3v v ol + 0.5v t lz de output high output low t zl t zh t zh(shdn) t zl(shdn) (on/off for shdn) enabled signal generator r r a rxen (qfn only) b a 0v 15pf r a +1.5v -1.5v t plh 0v 0v v cc 0v 1.5v 1.5v t phl b 1k v cc gnd sw for shdn tests, switch on/off rather than rxen parameter on/rxen bsw t hz (qfn only) 1/- +1.5v gnd t lz (qfn only) 1/- -1.5v v cc t zh (qfn only) 1/- +1.5v gnd t zl (qfn only) 1/- -1.5v v cc t zh(shdn) -/0 +1.5v gnd t zl(shdn) -/0 -1.5v v cc signal generator r r a b a 15pf rxen (qfn only) r a 3v 0v 1.5v 1.5v v oh 0v 1.5v v oh - 0.5v t hz r a v cc v ol 1.5v v ol + 0.5v t lz rxen (qfn only) output high output low t zl t zh t zl(shdn) t zh(shdn) 3v 0v 1.5v on/off (for shdn tests) enabled
ISL81334, isl41334 fn6202 rev.4.00 page 16 of 32 mar 24, 2017 typical application rs-232 to rs-485 converter the ISL81334 and isl41334 are ideal for implementing a single ic 2-wire (tx data, rx data) protoc ol converter, because each port can be programmed for a different protocol. figure 16 illustrates the simple connections to create a single transceiver rs-232 to rs-485 converter. depending on the rs-232 data rate, using an rs-422 bus as an rs-232 ?extension cord? can extend the transmission distance up to 4000 ? (1220m). a similar circuit on the other end of the cable completes the conversion to/from rs-232. detailed description each of the two ISL81334 and isl41334 ports support dual protocols: rs-485/422 and rs-232. rs-485 and rs-422 are differential (balanced) data transm ission standards for use in high speed (up to 20mbps) networks, or long haul and noisy environments. the differential signaling, coupled with rs-485?s requirement for extended common-mode range (cmr) of +12v to -7v make these transceivers extremely tolerant of ground potential differences, as well as voltages induced in the cable by external fields. both of these effects are real concerns when communicating over the rs-485, rs-422 maximum dist ance of 4000? (1220m). it is important to note that the ISL81334 and isl41334 do not follow the rs-485 convention whereby the inverting i/o is labeled ?b/z?, and the noninverting i/o is ?a/y?. thus, in the application diagrams below the 1334 a/y (b/z) pins connect to the b/z (a/y) pins of the generic rs-485, rs-422 ics. figure 14a. test circuit fig ure 14b. measurement points figure 14. rs-232 driver propagat ion delay and transition times figure 15a. test circuit figure 15b. measurement points figure 15. rs-232 receiver propagation delay and transition times test circuits and waveforms (continued) d d y, z signal generator r l y, z c l out (y,z) 3v 0v 1.5v 1.5v v o+ v o- 0v 0v d y, z skew = |t dphl - t dplh | t dphl t dplh r rxen (qfn only) a, b signal generator r a, r b c l = 15pf r a, r b 3v 0v t rphl 1.7v 1.3v v oh v ol 0.8v 2.4v t rplh a, b skew = |t rphl - t rplh | figure 16. single ic rs-232 to rs-485 converter 26 v cc y1 z1 d y1 d z1 0.1f + 0.1f + 0.1f 22 23 6 7 1 2 3 15 v+ v- c1+ c1- c2+ c2- + 0.1f 28 27 r a1 a1 4 5k r b1 b1 525 5k c 1 c 2 + c 3 c 4 gnd +5v + 0.1f 14 sel1 on/off 8 20 v cc 24 r r d d note: pinout for soic and ssop y2 z2 d y2 19 11 10 de2 18 v cc d r a2 a2 13 b2 12 17 r sel2 9 v cc rs-232 in rs-232 out rs-485 in rs-485 out nc nc nc txd rxd
ISL81334, isl41334 fn6202 rev.4.00 page 17 of 32 mar 24, 2017 rs-422 is typically a point-to-point (one driver talking to one receiver on a bus) or a point-to-multipoint (multidrop) standard that allows only one driver and up to 10 receivers on each bus. because of the one driver per bus limitation, rs-422 networks use a two bus, full duplex structure for bidirectional communication, and the rx inputs and tx outputs (no tri-state required) connect to different busses, as shown in figure 18 . conversely, rs-485 is a true multipoint standard, which allows up to 32 devices (any combination of drivers?must be tri-statable?and receivers) on each bus. now bidirectional communication takes place on a single bus, so the rx inputs and tx outputs of a port connect to the same bus lines, as shown in figure 17 . each port set to rs-485 /422 mode includes one rx and one tx. rs-232 is a point-to-point, singled ended (signal voltages referenced to gnd) communication protocol targeting fairly short (<150?, 46m) and low data rate (<1mbps) applications. each port contains two transceivers (2 tx and 2 rx) in rs-232 mode. protocol selection is handled through a logic pin (selx) for each port. ISL81334 and isl41334 advantages these dual protocol ics offer many parametric improvements compared to those offered on competing dual protocol devices. some of the major improvements are: ? 15kv bus pin esd - eases board level requirements ?2.7v diff v out - better noise immunity and/or distance ? full fail-safe rs-485 rx - eliminates bus biasing ? selectable rs-485 data rate - up to 20mbps, or slew rate limited for low emi and fewer termination issues ? high rs-232 data rate - >460kbps ? lower tx and rx skews - wider, consistent bit widths ?lower i cc - maximum i cc is 2x to 4x lower than competition ? flow-through pinouts - tx and rx bus pins on one side/logic pins on the other, for easy routing to connector/uart ? smaller (ssop and qfn) and rohs compliant packaging. figure 17. typical half duplex rs-485 network figure 18. typical rs-422 network 0.1f + d r v cc gnd ra rxen * de dy y z +5v r t 0.1f + d r v cc gnd ro re de di a/y b/z +5v 0.1f + d v cc gnd ro re de di a/y b/z +5v r r t ISL81334, isl41334 generic 1/2 duplex 485 xcvr generic 1/2 duplex 485 xcvr tx/rx * qfn only a b 0.1f + d r v cc gnd ra de dy b a +5v 0.1f + d r v cc gnd ro di a z +5v 0.1f + v cc gnd ro re +5v r r t ISL81334, isl41334 (master) generic 422 rx (slave) generic full duplex 422 xcvr (slave) a b r t y z y b 1k or nc
ISL81334, isl41334 fn6202 rev.4.00 page 18 of 32 mar 24, 2017 rs-232 mode rx features rs-232 receivers invert and convert rs-232 input levels (3v to 25v) to the standard ttl/cmos levels required by a uart, asic, or microcontroller serial port. re ceivers are designed to operate at faster data rates than the drivers, and they feature very low skews (10ns) so the receivers cont ribute negligibly to bit width distortion. inputs include the standards required 3k to 7k pull- down resistor, so unused inputs may be left unconnected. rx inputs also have built-in hyster esis to increase noise immunity, and to decrease erroneous triggeri ng due to slowly transitioning input signals. rx outputs are short-circuit protec ted, and are only tri-statable when the entire ic is sh ut down through the on/off pin, or through the active low rxen pin available on the qfn package option (see ? isl41334 (qfn package) special features ? on page 20 for more details). tx features rs-232 drivers invert and convert the standard ttl/cmos levels from a uart or microcontroller se rial port to rs-232 compliant levels (5v minimum). the tx delivers these compliant output levels even at data rates of 650kbps, and with loads of 1000pf. the drivers are designed for low skew (typically 12% of the 500kbps bit width), and are compliant to the rs-232 slew rate specification (4v/s to 30v/s) for a wide range of load capacitances. tx inputs float if left unconnected, and may cause i cc increases. for the best results, connect unused inputs to gnd. tx outputs are short-circuit protected, and incorporate a thermal shdn feature to protect the ic in situations of severe power dissipation. see ? rs-485 mode ? for more details. drivers tri-state only in shdn, or when the 5v power supply is off. the shdn function is useful for tri-statin g the outputs if both ports will always be tri-stated together (for example, used as a four transceiver rs-232 port), and if it is acceptable for the rx to be disabled as well. a single port tx disable can be accomplished by switching the port to rs-485 mode, and then using the corresponding de pin to tri-state the drivers. of course, the rx is now an rs-485 rx, so this option is feasible only if the rx are not needed when the tx are disabled. charge pumps the on-chip charge pumps create the rs-232 transmitter power supplies (typically +6/-7v) from a single supply as low as 4.5v, and are enabled only if either port is configured for rs-232 operation. the efficient design requires only four small 0.1f capacitors for the voltage doubler and inverter functions. by operating discontinuously (for example, turning off as soon as v+ and v- pump up to the nominal values), the charge pump contribution to rs-232 mode i cc is reduced significantly. unlike competing devices that require the charge pump in rs-485 mode, disabling the charge pump saves power, and minimizes noise. if the application keeps both ports in rs-485 mode (for example, a dedicated dual channel rs-485 interface), then the charge pump capacitors are not even required. data rates and cabling drivers operate at data rates of up to 650kbps, and are guaranteed for data rates of up to 460kbps. the charge pumps and drivers are designed so that one driver in each port can be operated at the rated load and at 460kbps (see figure 42 ). figure 42 also shows that drivers can easily drive several thousands of picofarads at data rates up to 250kbps, while still delivering compliant 5v output levels. receivers operate at data rates up to 2mbps. they are designed for a higher data rate to facilitate faster factory downloading of software into the final product, thereby improving the user?s manufacturing throughput. figures 45 and 46 illustrate driver and receiver waveforms at 250kbps and 500kbps, respectively. for these graphs, one driver of each port drives the specified capacitive load, and a receiver in the port. rs-232 does not require anything special for cabling; just a single bus wire per transmitter an d receiver, and another wire for gnd. so ISL81334 and isl41334 rs-232 ports use a five conductor cable for interconnection. bus terminations are not required, nor allowed, by the rs-232 standard. rs-485 mode rx features rs-485 receivers convert differential input signals as small as 200mv to ttl/cmos output levels, as required by the rs-485 and rs-422 standards. the differential rx provides maximum sensitivity, noise immunity, and common-mode rejection. according to the rs-485 standard, receiver inputs function with common-mode voltages as grea t as 7v outside the power supplies (that is, +12v and -7v), making them ideal for long networks where induced voltages are a realistic concern. each rs-485, rs-422 port includes a single receiver (ra), and the unused rx output (rb) is disabled, but pulled high by an internal current source. the internal current source turns off in shdn. worst case receiver input current s are 20% lower than the 1 ?unit load? (1ma) rs-485 limit, which translates to a 15k minimum input resistance. these receivers include a ?full fail-safe? function that ensures a high level receiver output if the receiver inputs are unconnected (floating), shorted together, or if the bus is terminated but undriven (that is, differential vo ltage collapses to near zero due to termination). fail-safe with shorted, or terminated and undriven inputs is accomplished by setting the rx upper switching point at -40mv, thereby ensuring that the rx recognizes a 0v differen tial as a high level. all the rx outputs are short-circuit protected, and are tri-state when the ic is forced into shdn, but ISL81334 (soic and ssop) receiver outputs are not independently tri-statable. isl41334 (qfn) receiver outputs are tri-st atable via an active low rxen input for each port (see ? isl41334 (qfn package) special features ? on page 20 for more details).
ISL81334, isl41334 fn6202 rev.4.00 page 19 of 32 mar 24, 2017 tx features the rs-485 and rs-422 driver is a differential output device that delivers at least 2.2v across a 54 load (rs-485), and at least 2.5v across a 100 load (rs-422). both levels significantly exceed the standards requirements, and these exceptional output voltages increase system noise immunity, and/or allow for transmission over longer di stances. the drivers feature low propagation delay skew to maximize bit widths, and to minimize emi. to allow multiple drivers on a bu s, the rs-485 spec requires that drivers survive worst case bus contentions undamaged. ISL81334 and isl41334 drivers meet this requirement through driver output short-circuit current limits, and on-chip thermal shutdown circuitry. the output stages incorporate current limiting circuitry that ensures that the output current never exceeds the rs-485 specification, even at the common-mode voltage range extremes. in the event of a major short-circuit condition, devices also include a thermal shutdown fe ature that disables the drivers whenever the die temperature beco mes excessive. this eliminates the power dissipation, allowing the die to cool. the drivers automatically re-enable after th e die temperature drops about 15. if the contention persists, the thermal shutdown/re-enable cycle repeats until the fault is cl eared. receivers stay operational during thermal shutdown. rs-485 multi-driver operation also requires drivers to include tri- state functionality, so each port has a de pin to control this function. if the driver is used in an rs-422 network, such that driver tri-state is not required , then the de pin can be left unconnected and an internal pull-up keeps it in the enabled state. drivers are also tri-stated when the ic is in shdn, or when the 5v power supply is off. speed options the ISL81334 (soic, ssop) has fixed, high slew rate driver outputs optimized for 20mbps data rates. the isl41334 (qfn) offers three user selectable data rate options: ?fast? for high slew rate and 20mbps, ?medium? wi th slew rate limiting set for 460kbps, and ?slow? with even more slew rate limiting for 115kbps operation. see ? data rate, cables, and terminations ? on page 19 and ? rs-485 slew rate limited data rates ? on page 21 for more information. receiver performance is the same for all three speed options. data rate, cables, and terminations rs-485, rs-422 are intended for network lengths up to 4000? (1220m), but the maximum system data rate decreases as the transmission length increase s. devices operating at the maximum data rate of 20mbps are limited to lengths of 20? to 30? (6m to 9m), while devices op erating at or below 115kbps can operate at the maximum length of 4000? (1220m). higher data rates require faster edges, so both ISL81334 and isl41334 versions offer an edge rate capable of 20mbps data rates. the isl41334 also offers two slew rate limited edge rates to minimize problems at slower data rates. nevertheless, for the best jitter performance when driving long cables, the faster speed settings may be preferable, even at low data rates. see ? rs-485 slew rate limited data rates ? on page 21 for details. twisted pair is the cable of choice for rs-485/rs-422 networks. twisted pair cables tend to pick up noise and other electromagnetically induced volt ages as common-mode signals, which are effectively rejected by the differential receivers in these ics. the preferred cable connection tech nique is ?daisy-chaining?, in which the cable runs from the conn ector of one device directly to the connector of the next device, such that cable stub lengths are negligible. a ?backbone? structure, where stubs run from the main backbone cable to each device?s connector, is the next best choice, but care must be taken to ensure that each stub is electrically ?short?. see table 4 for recommended maximum stub lengths for each speed option. proper termination is imperative to minimize reflections when using the 20mbps speed option. sh ort networks using the medium and slow speed options need not be terminated, but terminations are recommended unless power dissipation is an overriding concern. note that the rs-485 sp ecification allows a maximum of two terminations on a network, otherwise the tx output voltage may not meet the required v od . in point-to-point, or point-to-multipoint (rs-422) networks, the main cable should be terminated in its characteristic impedance (typically 120 ) at the end farthest from the driver. in multi- receiver applications, stubs co nnecting receivers to the main cable should be kept as short as possible, but definitely shorter than the limits shown in table 4 . multipoint (rs-485) systems require that the main cable be te rminated in its characteristic impedance at both ends. again, keep stubs connecting a transceiver to the main cable as short as possible, and refer to table 4 . avoid ?star?, and other configurations, that have many ?ends?, which would require more than the two allowed terminations to prevent reflections. high esd all pins on ISL81334 and isl41334 include esd protection structures rated at 4kv (hbm), which is good enough to survive esd events commonly seen during manufacturing. however, the bus pins (tx outputs and rx inputs) are particularly vulnerable to esd events because they connect to an exposed port on the exterior of the finished product. simply touching the port pins, or connecting a cable, can destroy an unprotected port. ISL81334 and isl41334 bus pins are fitted with advanced structures that deliver esd protection in ex cess of 15kv (hbm), without interfering with any signal in the rs-485 or the rs-232 range. this high level of protection may eliminate the need for board level protection, or at the very least will increase the robustness of any board level scheme. table 4. recommended stub lengths speed option maximum stub length ft (m) slow 350 to 500 (107 to 152) med 100 to 150 (30.5 to 46) fast 1 to 3 (0.3 to 0.9)
ISL81334, isl41334 fn6202 rev.4.00 page 20 of 32 mar 24, 2017 small packages many competing dual protocol ics are available only in excessively large 24 to 28 ld soic packages. the ISL81334?s 28 ld ssop is 50% smaller than even a 24 ld soic, and the isl41334?s tiny 6mmx6mm qfn is 80% smaller than a 28 ld soic. flow through pinouts even the ISL81334 and isl41334 pino uts are features, in that the ?flow-through? design simplifies bo ard layout. having the bus pins all on one side of the packag e for easy routing to a cable connector, and the rx outputs and tx inputs on the other side for easy connection to a uart, av oids costly and problematic crossovers. figure 19 illustrates the flow-through nature of the pinout. low power shutdown (shdn) mode the on/off pin is driven low to place the ic (both ports) in the shdn mode, and the already low supply current drops to as low as 25a. if this functi onality is not desired, the pin can be left disconnected (thanks to the internal pull-up), or it can be connected to v cc (v l for the qfn), through a 1k resistor. shdn disables the tx and rx outputs, and disables the charge pumps if either port is in rs-232 mode, so v+ collapses to v cc , and v- collapses to gnd. all but 5a of shdn i cc current is due to control input (on, lb , sp, de) pull-up resistors (~20a/resistor), so shdn i cc varies depending on the ISL81334 and isl41334 configuration. the specification tables indicate the worst case values, but careful selection of the configuration yields lower currents. for example, in rs-232 mode the sp pins are not used, so if both ports are configured for rs-232, floating or tying the sp pins high minimizes shdn i cc . likewise in rs-485 mode, the drivers are disabled in shdn, so driving the de pins high during this time also reduces i cc . on the isl41334, the shdn i cc increases as v l decreases. v l powers the input stage and sets its v oh at v l rather than v cc . v cc powers the second stage, but the second stage input is not driven to the rail, so some i cc current flows. see figure 29 on page 23 for details. when enabling from shdn in rs-232 mode, allow at least 20s for the charge pumps to stabiliz e before transmitting data. the charge pumps are not used in rs-485 mode, so the transceiver is ready to send or receive data in less than 1s, which is much faster than competing devices that require the charge pump for all modes of operation. internal loopback mode driving the lb pin low (ISL81334), or the lb pin and the rxen pin low (isl41334), places both ports in the loopback mode, a mode that facilitates implementing board level self-test functions. in loopback, internal switches discon nect the rx inputs from the rx outputs, and feed back the tx outputs to the appropriate rx output. this way the data driven at the tx input appears at the corresponding rx output (refer to ? typical operating circuits ? on pages 8 and 9 ). the tx outputs remain connected to their terminals, so the external loads are reflected in the loopback performance. this allows the l oopback function to potentially detect some common bus faults such as one or both driver outputs shorted to gnd, or outputs shorted together. note that the loopback mode uses an additional set of receivers, as shown in ? typical operating circuits ? on pages 8 and 9 . these loopback receivers are not standa rds compliant, so the loopback mode cannot be used to implement a half-duplex rs-485 transceiver. if loopback is not used, the pin can be left disconnected (thanks to the internal pull-up), or it should be connected to v cc (v l for the qfn), through a 1k resistor. isl41334 (qfn package) special features logic supply (v l pin) the isl41334 (qfn) includes a v l pin that powers the logic inputs (tx inputs and control pins) and rx outputs. these pins interface with ?logic? devices such as uarts, asics, and microcontrollers, and today most of these devices use power supplies significantly lower than 5v. thus, a 5v output level from a 5v powered dual protocol ic might seriously overdrive and damage the logic device input. si milarly, the logic device?s low v oh might not exceed the v ih of a 5v powered dual protocol input. connecting the v l pin to the power supply of the logic device (as shown in figure 20 on page 21 ) limits the isl41334?s rx output v oh to v l (see figure 23 on page 22 ), and reduces the tx and control input switching points to values compatible with the logic device output levels. tailoring the logic pin input switching points and output leve ls to the supply voltage of the uart, asic, or microcontroller eliminates the need for a level shifter/translator between the two ics. uart or asic or controller ra2 dy2 ra1 dy1 z2 y2 y1 z1 a1 b1 a2 b2 connector ISL81334 figure 19. illustration of flow through pinout d r
ISL81334, isl41334 fn6202 rev.4.00 page 21 of 32 mar 24, 2017 v l can be anywhere from v cc down to 1.65v, but the input switching points may not provide enough noise margin when v l <1.8v. table 5 indicates typical v ih and v il values for various v l values so users can ascertain whether or not a particular v l voltage meets their needs. the v l supply current (i l ) is typically less than 100a, as shown in figures 28 and 29 . all of the dc v l current is due to inputs with internal pull-up resistors (de, sp, lb , on/off ) being driven to the low input state. the worst case i l current occurs during shdn (see figure 28 ), due to the i l through the on/off pin pull-up resistor when that pin is driven low. i il through an input pull-up resistor is ~20a, so the i l in figure 28 drops by about 40a (at v l = 5v) when the two sp inputs are high (middle vs top curve). i l is lowest in the rs-232 mode, because only the on/off pin should be driven low. when all these inputs are driven high, i l drops to <1a, so to minimize power dissipation drive these inputs high when unneeded (sp inputs are not us ed in rs-232 mode, so drive them high). active low rx enable (rxen) in many rs-485 applications , especially half duplex configurations, users like to accomplish ?echo cancellation? by disabling the corresponding receiver while its driver is transmitting data. this function is available on the qfn package via an active low rxen pin for each port. the active low function also simplifies direction control, by allowing a single tx/rx direction control line. if an active high rxen were used, either two valuable i/o pins would be used for direction control, or an external invert er is required between de and rxen. figure 21 details the advantage of using the rxen pin. rs-485 slew rate limited data rates the soic and ssop versions of this ic operate with tx output transitions optimized for a 20mbp s data rate. these fast edges may increase emi and reflection issues, even though fast transitions are not required at the lower data rates used by many applications. the isl41334 (qfn version) solves this problem by offering two additional, slew rate limited, data rates that are optimized for speeds of 115kbps, and 460kbps.the slew limited edges permit longer unterminated networks, or longer stubs off terminated busses, and help minimize emi and reflections. ne vertheless, for the best jitter performance when driving long cables, the faster speed options may be preferable, even at lower data rates. the faster output transitions deliver less variability (jitter) when loaded with the large capacitance associated with long cables. figure 20. using v l pin to adjust logic levels table 5. v ih and v il vs v l for v cc = 5v v l (v) v ih (v) v il (v) 1.65v 0.79 0.50 1.8v 0.82 0.60 2.0v 0.87 0.69 2.5v 0.99 0.86 3.3v 1.19 1.05 gnd r xd t xd v cc = +2v uart/processor gnd r a d y v cc = +5v ISL81334 v oh ? 2v v oh = 5v v ih ? 2v esd diode gnd r xd t xd v cc = +2v uart/processor gnd r a d y v cc = +5v isl41334 v oh ? 2v v oh = 2v v ih = 0.9v esd diode v l figure 21. using active low vs active high rx enable 0.1 f + d r v cc gnd ra rxen den dy +5v isl81387 tx/rx active high rx enable 0.1 f + d r v cc gnd ra rxen * de dy +5v isl41334 tx/rx * qfn only active low rx enable y z a b y z a b
ISL81334, isl41334 fn6202 rev.4.00 page 22 of 32 mar 24, 2017 figures 51 , 52 , and 53 detail the jitter performance of the three speed options while driving three different cable lengths. the figures show that under all conditions the faster the edge rate, the better the jitter performance. of course, faster transitions require more attent ion to ensuring short stub lengths, and quality terminations, so there are trade-offs to be made. assuming a jitter budget of 10%, it is likely better to go with the slow speed option for da ta rates of 115kbps or less to minimize fast edge effects. likewise, the medium speed option is a good choice for data rates between 115kbps and 460kbps. for higher data rates, or when the absolute best jitter is required, use the high speed option. speed selection is via the spa and spb pins (see table 3 on page 7 ), and the selection pertains to each port programmed for rs-485 mode. evaluation board an evaluation board, part number isl41334eval1z, is available to assist in assessi ng the dual protocol ic?s performance. the evaluation board contains a qfn packaged device, but because the same die is used in all packages, the board is also useful for evaluati ng the functionality of the other versions. the board?s design al lows for evaluation of all standard features, plus the qfn-specific features. refer to the eval board application note for details, and contact your sales representative for ordering information. typical performance curves v cc = v l = 5v, t a = +25c; unless otherwise specified. figure 22. receiver output current vs receiver output voltage figure 23. receiver high outp ut voltage vs logic supply voltage (v l ) figure 24. rs-485, driver outp ut current vs differential output voltage figure 25. rs-485, driver differential output voltage vs temperature 012345 0 10 20 30 40 50 receiver output voltage (v) receiver output current (ma) v oh , +25c v oh , +85c v ol , +25c v ol , +85c v l (v) high output voltage (v) 012345 0 1 2 3 4 5 i oh = -1ma i oh = -4ma i oh = -8ma differential output voltage (v) driver output current (ma) 012345 0 10 20 30 40 50 60 70 80 90 100 -40 0 50 85 temperature (c) differential output voltage (v) -25 25 75 r diff = 54 r diff = 100 3.0 3.1 3.2 3.3 3.4 3.5 3.6
ISL81334, isl41334 fn6202 rev.4.00 page 23 of 32 mar 24, 2017 figure 26. rs-485, driver output current vs short-circuit voltage figure 27. supply current vs temperature figure 28. rs-232, v l supply current vs v l voltage (qfn only) figure 29. v cc and v l shdn supply currents vs v l voltage (qfn only) typical performance curves v cc = v l = 5v, t a = +25c; unless otherwise specified. (continued) output voltage (v) -7 -6 -4 -2 0 2 4 6 8 10 12 output current (ma) -150 -100 -50 0 50 100 150 y or z = high y or z = low +25c +85c -40c full temp range -40 0 50 85 temperature (c) i cc (ma) -25 25 75 1.0 1.5 2.0 2.5 3.0 3.5 4.0 rs-232, rxen = x rs-485, de = gnd, rxen = x rs-485, half duplex, de = v cc , rxen = x rs-485, full duplex, de = v cc , rxen = x i l (a) v l (v) 1 10 100 10m 1m 23456 v l v cc v l > v cc no load v in = v l or gnd lb = v l rs-232, on = gnd, sp = v l rs-485, de = on = gnd, sp = v l rs-485, de = on = sp = gnd 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 100 200 300 400 500 600 i cc and i l (ma) v l (v) no load v in = v l or gnd lb = v l on = dz/de = dy = gnd rs-232/rs-485 i cc sp = gnd sp = v l rs-232 i l rs-485 i l
ISL81334, isl41334 fn6202 rev.4.00 page 24 of 32 mar 24, 2017 figure 30. rs-485, driver propagation delay vs temperature (slow data rate, qfn only) figure 31. rs-485, driver skew vs temperature (slow data rate, qfn only) figure 32. rs-485, driver propagation delay vs temperature (medium data rate, qfn only) figure 33. rs-485, driver skew vs temperature (medium data rate, qfn only) typical performance curves v cc = v l = 5v, t a = +25c; unless otherwise specified. (continued) -40 0 50 85 temperature (c) -25 25 75 propagation delay (ns) 1400 1450 1500 1550 1600 1650 1700 t dlh t dhl r diff = 54, c l = 100pf t dhl -40 0 50 85 temperature (c) skew (ns) -25 25 75 400 |t plhz - t phly | |t phlz - t plhy | |t dlh - t dhl | r diff = 54, c l = 100pf 50 100 150 200 250 300 350 -40 0 50 85 temperature (c) -25 25 75 propagation delay (ns) 470 480 490 500 510 520 530 540 550 560 t dlh t dhl t dhl r diff = 54, c l = 100pf -40 0 50 85 temperature (c) skew (ns) -25 25 75 0 20 40 60 80 100 120 r diff = 54, c l = 100pf |t phlz - t plhy | |t plhz - t phly | |t dlh - t dhl |
ISL81334, isl41334 fn6202 rev.4.00 page 25 of 32 mar 24, 2017 figure 34. rs-485, driver propagation delay vs temperature (fast data rate) figure 35. rs-485, driver skew vs temperature (fast data rate) figure 36. rs-485, driver and receiver waveforms, low to high (slow data rate, qfn only) figure 37. rs-485, driver and receiver waveforms, high to low (slow data rate, qfn only) figure 38. rs-485, driver and receiver waveforms, low to high (medium data rate, qfn only) figure 39. rs-485, driver and receiver waveforms, high to low (medium data rate, qfn only) typical performance curves v cc = v l = 5v, t a = +25c; unless otherwise specified. (continued) -40 0 50 85 temperature (c) -25 25 75 t dlh t dhl propagation delay (ns) 20 25 30 35 40 r diff = 54?, c l = 100pf -40 0 50 85 temperature (c) skew (ns) -25 25 75 0 0.5 1.0 1.5 2.0 2.5 r diff = 54?, c l = 100pf |t plhz - t phly | |t phlz - t plhy | |t dlh - t dhl | time (400ns/div) d y receiver output (v) driver output (v) 0 5 0 5 driver input (v) r diff = 60?, c l = 100pf r a 0 1 2 3 4 5 z y time (400ns/div) d y receiver output (v) driver output (v) 0 5 0 5 driver input (v) r diff = 60?, c l = 100pf r a 0 1 2 3 4 5 z y time (200ns/div) d y receiver output (v) driver output (v) 0 5 0 5 driver input (v) r diff = 60?, c l = 100pf r a 0 1 2 3 4 5 z y time (200ns/div) d y receiver output (v) driver output (v) 0 5 0 5 driver input (v) r diff = 60?, c l = 100pf r a 0 1 2 3 4 5 z y
ISL81334, isl41334 fn6202 rev.4.00 page 26 of 32 mar 24, 2017 figure 40. rs-485, driver and receiver waveforms, low to high (fast data rate) figure 41. rs-485, driver and receiver waveforms, high to low (fast data rate) figure 42. rs-232, transmitter output voltage vs load capacitance figure 43. rs-232, transmit ter output voltage vs temperature figure 44. rs-232, transmitte r short-circuit current vs temperature figure 45. rs-232, transmitter and receiver waveforms at 250kbps typical performance curves v cc = v l = 5v, t a = +25c; unless otherwise specified. (continued) time (10ns/div) d y receiver output (v) driver output (v) 0 5 0 5 driver input (v) r diff = 60?, c l = 100pf r a 0 1 2 3 4 5 z y time (10ns/div) d y receiver output (v) driver output (v) 0 5 0 5 driver input (v) r diff = 60?, c l = 100pf r a 0 1 2 3 4 5 z y -7.5 -5.0 -2.5 0 2.5 5.0 7.5 1000 2000 3000 4000 5000 0 load capacitance (pf) transmitter output voltage (v) 1 transmitter/port at 250kbps or 500kbps, v out + v out - other transmitters at 30kbps all t outs loaded with 3k ? to gnd 500kbps 500kbps 250kbps 250kbps rs-232 region of noncompliance -40 0 50 85 temperature (c) transmitter output voltage (v) -25 25 75 -7.5 -5.0 0 5.0 7.5 2.5 -2.5 v out + v out - outputs static all t outs loaded with 3k ? to gnd -40 0 50 85 temperature (c) transmitter output current (ma) -25 25 75 -40 -30 -20 -10 0 10 20 30 40 y or z = high y or z = low v out shorted to gnd 2 s/div c l = 3500pf, 1 channel switching/port y/a 0 -5 0 5 0 5 5 ra dy
ISL81334, isl41334 fn6202 rev.4.00 page 27 of 32 mar 24, 2017 figure 46. rs-232, transmitter and receiver waveforms at 500kbps figure 47. rs-232, receiver output + duty cycle vs data rate figure 48. rs-232, transmitter maximum data rate vs load capacitance figure 49. rs-232, transmitter output voltage vs data rate figure 50. rs-232, transmitter skew vs data rate figure 51. rs-485, transmitter jitter vs data rate with 2000? cat-5 cable typical performance curves v cc = v l = 5v, t a = +25c; unless otherwise specified. (continued) 1s/div c l = 1000pf, 1 channel switching/port y/a 0 -5 0 5 0 5 5 ra dy 500 1000 1500 2000 48 50 52 54 56 58 60 data rate (kbps) receiver + duty cycle (%) full temp range sr in = 15v/s sr in = 100v/s 50 v in = 5v 100 1000 2000 3000 4000 5000 100 200 300 400 500 600 700 800 900 1000 1100 load capacitance (pf) data rate (kbps) 2 transmitters at +25c 2 transmitters at +85c 1 transmitter at +25c v out ? ? 4v all t outs loaded with 5k ? to gnd 1 transmitter at +85c 0 100 200 300 400 500 600 700 800 -7.5 -5.0 0 5.0 7.5 2.5 -2.5 data rate (kbps) transmitter output voltage (v) +25 c +85 c +25 c +85 c v out + v out - 1 transmitter switching on each port all t outs loaded with 5k ? to gnd, c l = 1000pf rs-232 region of noncompliance 50 150 250 350 450 550 650 750 150 200 250 300 350 400 450 data rate (kbps) skew (ns) +25c +85c all t outs loaded with 3k ? to gnd, c l = 1000pf 1 transmitter switchi ng on each port data rate (kbps) jitter (%) 32 100 200 300 400 500 600 700 800 900 1000 0.1 1 10 100 double term?ed with 121 ? slow med fast
ISL81334, isl41334 fn6202 rev.4.00 page 28 of 32 mar 24, 2017 die characteristics substrate and qfn thermal pad potential (powered up) gnd transistor count 4838 process bicmos figure 52. rs-485, tran smitter jitter vs data rate with 1000? cat-5 cable figure 53. rs-485, transmitter jitter vs data rate with 350? cat-5 cable typical performance curves v cc = v l = 5v, t a = +25c; unless otherwise specified. (continued) data rate (kbps) jitter (%) 32 100 200 300 400 500 600 700 800 900 1000 0.1 1 10 100 double term?ed with 121 ? slow med fast data rate (kbps) jitter (%) 32 100 200 300 400 500 600 700 800 900 1000 0.1 1 10 100 double term?ed with 121 ? slow med fast
fn6202 rev.4.00 page 29 of 32 mar 24, 2017 ISL81334, isl41334 intersil products are manufactured, assembled and tested utilizing iso9001 quality systems as noted in the quality certifications found at www.intersil.com/en/suppor t/qualandreliability.html intersil products are sold by description on ly. intersil may modify the circuit design an d/or specifications of products at any time without notice, provided that such modification does not, in intersil's sole judgment, affect the form, fit or function of the product. accordingly, the reader is cautioned to verify that datasheets are current before placing orders. information fu rnished by intersil is believed to be accu rate and reliable. however, no responsib ility is assumed by intersil or its subsidiaries for its use; nor for any infrin gements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com for additional products, see www.intersil.com/en/products.html ? copyright intersil americas ll c 2005-2017. all rights reserved. all trademarks and registered trademarks are the property of their respective owners. about intersil intersil corporation is a leading provider of innovative power ma nagement and precision analog so lutions. the company's product s address some of the largest markets within the industrial and infrastructure, mobile computing, and high-end consumer markets. for the most updated datasheet, application notes, related documentation, and related parts, see the respective product information page found at www.intersil.com . for a listing of definitions and abbreviations of common terms used in our documents, visit www.intersil.com/glossary . you can report errors or suggestions for improving this datasheet by visiting www.intersil.com/ask . reliability reports are also av ailable from our website at www.intersil.com/support . revision history the revision history provided is for in formational purposes only and is believ ed to be accurate, but not warranted. please visit our website to make sure you have the latest revision. date revision change mar 24, 2017 fn6202.4 updated entire datasheet applying new standards. added related literature section. updated ordering information table - added evaluation board, updated notes 1 and 2, and added tape and reel quantity, added note 3. updated pin lb description on 4. added notes 5 and 8. updated figures 1 through 4. added figures 5 through 8. updated first sentence in ?internal loopback mode? on page 20 to add clarification. added revision history and about intersil sections. updated pod m28.3 to the latest revision. changes were as follows: -added land pattern
ISL81334, isl41334 fn6202 rev.4.00 page 30 of 32 mar 24, 2017 package outline drawing l40.6x6 40 lead quad flat no-lead plastic package rev 3, 10/06 located within the zone indicate d. the pin #1 indentifier may b e unless otherwise specified, t olerance : decimal 0.05 tiebar shown (if present) i s a non-functional feature. the configuration of the pin #1 identifier is optional, but mus t be between 0.15mm and 0.30mm from the terminal tip. dimension b applies to the metallized terminal and is measured dimensions in ( ) for reference only. dimensioning and tolerancing c onform to amse y14.5m-1994. 6. either a mold or mark feature. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: (4x) 0.15 index area pin 1 a 6.00 b 6.00 31 36x 0.50 4.5 4x 40 pin #1 index area bottom view 40x 0 . 4 0 . 1 20 b 0.10 11 ma c 4 21 4 . 10 0 . 15 0 . 90 0 . 1 c seating plane base plane 0.08 0.10 see detail "x" c c 0 . 00 min. detail "x" 0 . 05 max. 0 . 2 ref c 5 side view 1 10 30 typical recommended land pattern ( 5 . 8 typ ) ( 4 . 10 ) ( 36x 0 . 5 ) ( 40x 0 . 23 ) ( 40x 0 . 6 ) 6 6 top view 0 . 23 +0 . 07 / -0 . 05 for the most recent package outline drawing, see l40.6x6 .
ISL81334, isl41334 fn6202 rev.4.00 page 31 of 32 mar 24, 2017 small outline plastic packages (soic) a index area e d n 123 -b- 0.25(0.010) c a m bs e -a- l b m -c- a1 a seating plane 0.10(0.004) h x 45o c h 0.25(0.010) b m m (1.50mm) (9.38mm) (1.27mm typ) (0.51mm typ) typical recommende d land pattern m28.3 (jedec ms-013-ae issue c) 28 lead wide body small outline plastic package symbol inches millimeters notes min max min max a 0.0926 0.1043 2.35 2.65 - a1 0.0040 0.0118 0.10 0.30 - b 0.013 0.0200 0.33 0.51 9 c 0.0091 0.0125 0.23 0.32 - d 0.6969 0.7125 17.70 18.10 3 e 0.2914 0.2992 7.40 7.60 4 e 0.05 bsc 1.27 bsc - h 0.394 0.419 10.00 10.65 - h 0.01 0.029 0.25 0.75 5 l 0.016 0.050 0.40 1.27 6 n28 287 ? 0 o 8 o 0 o 8 o - rev. 1, 1/13 notes: 1. symbols are defined in the mo series symbol list in section 2.2 of publication number 95. 2. dimensioning and tolerancing per ansi y14.5m - 1982. 3. dimension d does not include mold flash, protrusions or gat e burrs. mold flash, protrusion and gate burrs shall not exceed 0.15mm ( 0.006 inch) per side. 4. dimension e does not include interlead flash or protrusions . interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per side. 5. the chamfer on the body is optional. if it is not present, a visual index feature must be located within the crosshatched area. 6. l is the length of terminal for soldering to a substrate. 7. n is the number of terminal positions. 8. terminal numbers are shown for reference only. 9. the lead width b, as measured 0.36mm (0.014 inch) or greate r above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch) 10. controlling dimension: millimete r. converted inch dimensions are not necessarily exact . for the most recent package outline drawing, see m28.3 .
ISL81334, isl41334 fn6202 rev.4.00 page 32 of 32 mar 24, 2017 shrink small outline plastic packages (ssop) notes: 1. symbols are defined in the ?mo series symbol list? in section 2.2 of publication number 95. 2. dimensioning and tolerancing per ansi y14.5m - 1982. 3. dimension ?d? does not include mold flash, protrusions or gate burrs. mold flash, protrusion and gate burrs shall not exceed 0.20mm (0.0078 inch) per side. 4. dimension ?e? does not include interlead flash or protrusions. interlead flash and protrusions shall not exceed 0.20mm (0.0078 inch) per side. 5. the chamfer on the body is optional. if it is not present, a visual index feature must be located within the crosshatched area. 6. ?l? is the length of terminal for soldering to a substrate. 7. ?n? is the number of terminal positions. 8. terminal numbers are shown for reference only. 9. dimension ?b? does not includ e dambar protrusion. allowable dambar protrusion shall be 0.13mm (0.005 inch) total in excess of ?b? dimension at maximum material condition. 10. controlling dimension: millimeter. converted inch dimensions are not necessarily exact. index area e d n 123 -b- 0.25(0.010) c a m bs e -a- l b m -c- a1 a seating plane 0.10(0.004) c h 0.25(0.010) b m m ? 0.25 0.010 gauge plane a2 m28.209 (jedec mo-150-ah issue b) 28 lead shrink small outline plastic package symbol inches millimeters notes min max min max a- 0.078 - 2.00 - a1 0.002 - 0.05 -- a2 0.065 0.072 1.65 1.85 - b 0.009 0.014 0.22 0.38 9 c 0.004 0.009 0.09 0.25 - d 0.390 0.413 9.90 10.50 3 e 0.197 0.220 5.00 5.60 4 e 0.026 bsc 0.65 bsc - h 0.292 0.322 7.40 8.20 - l 0.022 0.037 0.55 0.95 6 n28 287 ? 0 8 0 8 - rev. 2 6/05 for the most recent package outline drawing, see m28.209 .

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