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june 16, 2016 xr32330 3-driver/3-receiver intelligent rs-232 transceiver with 1.65v-5.5v interface exar.comxr32330 rev 1b 1 / 13 general description the xr32330 product is a 3-driver/ 3-re ceiver rs-232 transceiver featur- ing a variable low voltage logic interface, down to 1.65v. this product is intended for portable or hand-held applications such as bar code scan- ners as well as point-of-sales termin als, security and industrial control applications. the xr32330eber device featur es slew-rate limited out- puts for reduced crosstalk and emi. the xr32330 uses an internal high-efficiency charge-pump power supply that requires only four 0.1 f capacitors in 3.3v operation. this charge pump combined with exar's driver architecture allow the xr32330 to deliver compliant rs-232 performance from a single power supply rang- ing from +3.0v to +5.5v. the auto on-line? feature allows the device to automatically "wake- up" during a shutdown state when an rs-232 cable is connected and a connected peripheral is turned on. otherwise, the device automatically shuts itself down dr awing less than 1 a. features ? meets true eia/tia- 232-f standards from a +3.0v to 5.5v power supply ?1.65v to 5.5v logic interface v l pin ? auto on-line circuitry automatically wakes up from a 1 ? a shutdown ? regulated charge pump yields stable rs-232 outputs regardless of v cc variations ? enhanced esd specifications ? 15kv human body model ? 15kv iec61000-4-2 air discharge ? 8kv iec61000-4-2 contact discharge ? 250kbps min transmission rate (speed grade b) ? -40c to 85c ambient operating temperature ? lead-free (rohs 6) qfn package applications ? portable and ha nd-held equipment ? industrial and proc ess control equipment ? point-of-sales equipment ? building security and automation ordering information C last page typical operating cir cuit and package pinout 1 2 3 4 5 7891011 13 14 15 16 17 20 21 22 23 24 6 12 18 19 status shutdown online c1- gnd vl vcc v+ c1+ c2+ c2- v- xr32330 24 pin qfn (4x4mm) r1in r2in t1out t2out r3in t3out t2in t1in r2out r1out t3in r3out t1out t2out t2in t1in r1in r2in r1out r2out shutdown online status charge pump c1+ c1- c2+ c2- v+ v- rs-232 outputs rs-232 inputs ttl/cmos inputs ttl/cmos outputs auto on-line / control 5k ? 5k ? 0.1 ? f 0.1 ? f 0.1 ? f 0.1 ? f 0.1 ? f v cc v cc to ? -p supervisor circuit v cc gnd 1 2 4 5 8 9 11 12 13 14 15 16 21 17 v l v l 0.1 ? f 18 19 20 24 23 22 t3out t3in 6 7 r3in r3out 5k ? 3 10
june 16, 2016 xr32330 2 / 13 exar.com/xr32330 rev 1b absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any maximum rating condition for extended periods may affect device reliability and lifetime. supply voltage (v cc )..................................-0.3v to +6.0v logic interface voltage (v l ).................................v l v cc v+................................................................-0.3v to +7.0v v-.................................................................+0.3v to -7.0v v+ + |v-| ....................................................................13v i cc (dc v cc or gnd current)...............................100ma junction temperature...............................................125c input voltages txin, online , shutdown ,....................-0.3v to +6.0v rxin..........................................................................15v output voltage txout....................................................................13.2v rxout, status .........................................-0.3v to +6.0v short-circuit duration txout..............................................................continuous storage temperature...............................-65c to +150c esd rating rs-232 bus pins hbm - human body model......................................15kv iec614000-4-2 air discharge..................................15kv iec614000-4-2 contact discharge............................8kv operating conditions operating temperature range...................-40c to +85c v cc supply range......................................... 3.0v to 5.5v v l i/o supply range (v l v cc ).................. 1.65v to 5.5v thermal information (24 ld qfn (4x4mm) ) ? ja .................................................................39.2 (c/w) ? jc .................................................................15.3 (c/w)
june 16, 2016 xr32330 3 / 13 exar.com/xr32330 rev 1b electrical characteristics specifications are at t a = 25c, v dd = 3.3v10% or 5.0v10%, v l = v dd ; limits applying over the full operating tempera- ture range are denoted by a ? . typical values represent the most likely parametric norm at t a = 25c, and are provided for reference purposes only. symbol parameter conditions min typ max units dc characteristics i cc1 supply current, auto on- line? enabled all rxin open, online = gnd, shut- down = v l , v cc = v l = 3.3v, txin = v l or gnd ?1.010a i cc2 supply current, shutdown shutdown = gnd, v cc = v l = 3 . 3 v, txin = v l or gnd ?1.010a i cc3 supply current, auto on- line? disabled online = shutdown = v l , no load, v cc = v l = 3.3v, txin = v l or gnd ?0.31.0ma logic inputs and outputs v il input low voltage txin, online , shutdown ; 1.65v v l 5.5v & v l v cc ? 1/3 * v l v v ih input high voltage ? 2/3 * v l v i il input leakage current txin, online , shutdown ; t amb = 25c, v in = 0v to v l 0.01 1.0 ? a i ol output leakage current status , rxout (receivers dis- abled); v out = 0v to v l ? 0.05 10 ? a v ol output low voltage status , rxout; i out = 1.5ma ? 0.4 v v oh output high voltage status , rxout; i out = -1.5ma ? v l - 0.6 v driver outputs v swing output voltage swing all drivers outputs loaded with 3k ? to gnd ? 5.0 5.4 v o r output resistance v cc = v+ = v- = 0v, v out = 2v ? 300 ? i osc output short-circuit current v out = 0v ? 35 60 ma i ol output leakage current v cc = 0v or 3.0v to 5.5v, v out = 12v ? 25 ? a receiver inputs ivr input voltage range ? -15 +15 v v il input low voltage v cc = 3.3v ? 0.6 1.2 v v cc = 5.0v ? 0.8 1.5 v v ih input high voltage v cc = 3.3v ? 1.5 2.4 v v cc = 5.0v ? 1.8 2.4 v rx hys receiver input hysteresis 0.3 v rx r receiver input resistance ? 3 5 7 k ?? auto on-line circuitry characteristics (online = gnd, shutdown = v l , v l = v cc ) rx stsh receiver threshold to status high level ?-2.7 +2.7 v
june 16, 2016 xr32330 4 / 13 exar.com/xr32330 rev 1b rx stsl receiver threshold to status low level ?-0.3 +0.3 v t stsh receiver threshold to status high figure 9 0.2 ? s t stsl receiver threshold to status low figure 9 30 ? s t online receiver thresholds to drivers enabled figure 9 , (charge pump fully discharged when receiver threshold crossed) 30 ? s t offline receiver thresholds to drivers dis- abled figure 9 35 ? s timing characteristics f max maximum output frequency r l = 3k ? , c l = 1000pf, 1 driver active ? 250 kbps t phl receiver propagation delay (high to low) receiver input (<10ns rise/fall) to receiver output, c l = 150pf 0.15 ? s t plh receiver propagation delay (low to high) receiver input (<10ns rise/fall) to receiver output, c l = 150pf 0.15 ? s t rxskew receiver skew |t phl - t plh |50ns t rxoe receiver output enable time normal operation 200 ns t rxod receiver output disable time normal operation 200 ns t txskew driver skew |t phl - t plh | (driver propagation delays) ? 100 500 ns tx slew transition-region slew rate v cc = 3.3v, r l = 3k ?? to 7k ? , c l = 150pf to 1000pf, measured from -3.0v to +3.0v or +3.0v to -3.0v ?6 30 v/ ? s symbol parameter conditions min typ max units
june 16, 2016 xr32330 5 / 13 exar.com/xr32330 rev 1b pin configuration pin assignments pin no. pin name type description 1, 2, 3 r1in, r2in, r3in inputs (5k ? pull-dwn) 15kv esd protected, rs-232 receiver inputs 4, 5, 6 t1out, t2out, t3out output 15kv esd protected, rs-232 driver output 7, 8, 9 t3in, t2in, t1in input ttl/cmos driver input 10, 11, 12 r3out, r2out, r1out output ttl/cmos receiver output 13 status output ttl/cmos level output indicating if no valid rs-232 levels are present at the r1in, r2in or r3in input pins. 14 shutdown input ttl/cmos level input, when driven low puts the xr32330 into shutdown mode (tri- stating driver outputs and disabling the charge-pump); normal operation when driven high. 15 online input ttl/cmos level input. a low input enables auto on-line mode, a high input disables auto on-line mode. 16, 21 c1-, c1+ analog negative and positive terminals of voltage doubler charge pump capacitor. 17 gnd supply ground 18 v l supply i/o power supply 19 v cc supply power supply 20 v+ analog regulated positive (+5.5v) charge pump rail. 22, 23 c2+, c2- analog positive and negative terminals of the inverting charge pump capacitor. 24 v- analog regulated negative (-5.5v) charge pump rail. - paddle supply ground. the exposed paddle on the bottom of package is connected to device ground. the paddle should be connected to ground on pcb. 1 2 3 4 5 7891011 13 14 15 16 17 20 21 22 23 24 6 12 18 19 status shutdown online c1- gnd vl vcc v+ c1+ c2+ c2- v- r1in r2in t1out t2out r3in t3out t2in t1in r2out r1out t3in r3out paddle
june 16, 2016 xr32330 6 / 13 exar.com/xr32330 rev 1b functional block diagram t1out t2out t2in t1in r1in r2in r1out r2out shutdown online status charge pump c1+ c1- c2+ c2- v+ v- rs-232 outputs rs-232 inputs ttl/cmos inputs ttl/cmos outputs auto on-line / control 5k ? 5k ? t3out t3in r3in r3out 5k ?
? 2014 exar corporation xr32330 7 / 13 exar.com/xr32330 rev 1b typical performance characteristics figure 1: transmitter output voltage vs supply voltage figure 2: supply current vs load capacitance -6 -4 -2 0 2 4 6 2.5 3 3.5 4 4.5 5 transmitter output voltage (v) supply voltage (v) t1 at 250kbps other drivers at 62.5kbps all drivers loaded with 3k : // 250pf 0 5 10 15 20 25 30 35 40 45 0 1000 2000 3000 4000 5000 supply current (ma) load capacitance (pf) 250kbps 120kbps 20kbps t1 driver at full data rate t2 & t3 drivers at 15.5kbps all drivers loaded with 3k : // c load figure 3 supply current vs supply voltage figure 4 transmitter output vo ltage vs load capacitance 0 5 10 15 20 25 30 35 2.5 3 3.5 4 4.5 5 supply current (ma) supply voltage (v) 250kbps t1 at full data rate t2 & t3 at 15.5kbps all drivers loaded with 3k : // 1000pf -6 -4 -2 0 2 4 6 0 1000 2000 3000 4000 5000 transmitter output voltage (v) load capacitance (pf) txout+ txout- xr32330eb, supply = 3.3v, t1 driver at 250kbps t2 & t3 drivers at 15.5kbps all drivers loads 3k : // c load
june 16, 2016 xr32330 8 / 13 exar.com/xr32330 rev 1b application information general description the xr32330 transceiver meets the eia/tia-232 and itu- t v.28/v.24 communication protocols and can be imple- mented in portable or hand-held applications such as bar code scanners as well as point-of-sales terminals, security and industrial control applications . the xr32330 device features exar's proprietary and patented (u.s. 5,306,954) on-board charge pump circuitry that generates 5.5v rs- 232 voltage levels from a single +3.0v to +5.5v power sup- ply. the xr32330 is a 3-driver/3-receiver device, ideal for por- table or hand-held applications. the xr32330 is an ideal choice for power sensitive designs. the xr32330 devices feature auto on-line? circuitry which reduces the power supply drain to a 1a supply current. in many portable or hand-held applications, an rs-232 cable can be disconnected or a connected peripheral can be turned off. under these conditions, the internal charge pump and the drivers will be shut down. otherwise, the sys- tem automatically comes online. this feature allows design engineers to address power saving concerns without major design changes. theory of operation the xr32330 series is made up of four basic circuit blocks: 1. drivers 2. receivers 3. the exar proprietary charge pump, and 4. auto on-line? circuitry. drivers the drivers are inverting level transmitters that convert ttl or cmos logic levels to 5.0v eia/tia-232 levels with an inverted sense relative to the input logic levels. typically, the rs-232 output voltage swing is 5.5v with no load and 5v minimum fully loaded. the driver outputs are protected against infinite short-circuits to ground without degradation in reliability. these drivers comply with the eia-tia-232-f and all previous rs-232 versions. unused drivers inputs should be connected to gnd or v l . the drivers have a minimum data rate of 250kbps fully loaded. receivers the receivers convert +5.0v eia/tia-232 levels to ttl or cmos logic output levels. receivers are high-z when the auto on-line? circuitry is enabled and activated or when in shutdown. the truth table logic of the xr32330 driver and receiver outputs can be found in table 2 on page 11 . since receiver input is usually from a transmission line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 300mv. this ensures that the receiver is virtually immune to noisy transmission lines. should an input be left unconnected, an internal 5k pull-down resistor to ground will commit the output of the receiver to a high state. charge pump the charge pump is a exarCpatented design (u.s. 5,306,954) and uses a unique approach compared to older lessCefficient designs. the charge pump still requires four external capacitors, but uses a fourCphase voltage shifting technique to attain symmetrical 5.5v power supplies. the internal power supply consists of a regulated dual charge pump that provides output voltages of 5.5v regardless of the input voltage (v cc ) over the +3.0v to +5.5v range. this is important to maintain comp liant rs-232 levels regardless of power supply fluctuations. the charge pump operates in a discontinuous mode using an internal oscillator. if the ou tput voltages are less than a magnitude of 5.5v, the charge pump is enabled. if the out- put voltages exceed a magnitude of 5.5v, the charge pump is disabled. this oscilla tor controls the four phases of the voltage shifting. a description of each phase follows. phase 1 v- charge storage, see figure 5 during this phase of the clock cycle, the positive side of capacitors c1 and c2 are initially charged to v cc . c1+ is then switched to gnd and the charge in c1C is transferred to c2C. since c2+ is con- nected to v cc , the voltage potential across capacitor c2 is now 2 times v cc . figure 5: charge pump - phase 1 c1 c2 c4 c3 v cc v + storage capacitor v - storage capacitor +v cc -v cc -v cc
june 16, 2016 xr32330 9 / 13 exar.com/xr32330 rev 1b phase 2 v- transfer, see figure 6 phase two of the clock con- nects the negative terminal of c2 to the v- storage capaci- tor and the positive terminal of c2 to gnd. this transfers a negative generated voltage to c3. this generated voltage is regulated to a minimum voltage of -5.5v. simultaneous with the transfer of the voltage to c3, the positive side of capac- itor c1 is switched to v cc and the negative side is con- nected to gnd. figure 6: charge pump - phase 2 phase 3 v+ charge storage, see figure 7 the third phase of the clock is identical to the first phase the charge transferred in c1 produces Cv cc in the negative terminal of c1, which is applied to the negative side of capacitor c2. since c2+ is at v cc , the voltage potential across c2 is 2 times v cc . figure 7: charge pump - phase 3 phase 4 v+ transfer, see figure 8 the fourth phase of the clock connects the negative terminal of c2 to gnd, and transfers this positive generated voltage across c2 to c4, the v+ storage capacitor. this voltage is regulated to +5.5v. at this voltage, the internal oscilla tor is disabled. simultaneous with the transfer of the voltage to c4, the positive side of capacitor c1 is switched to v cc and the negative side is connected to gnd, allowing the charge pump cycle to begin again. the charge pump cycle w ill continue as long as the operational conditions for the internal oscillator are present. figure 8: charge pump - phase 4 since both v+ and vC are separately generated from v cc , in a noCload condition v+ an d vC will be symmetrical. older charge pump approaches that generate vC from v+ will show a decrease in the magnitude of vC compared to v+ due to the inherent inefficiencies in the design. the clock rate for the charge pump typically operates at greater than 250khz. the external capacitors can be as low as 0.1f with a 16v breakdown voltage rating. the exar-patented charge pumps are designed to operate reliably with a range of low cost capacitors. either polarized or non polarized capacitors may be used. if polarized capacitors are used they should be oriented as shown in the typical applications circu it. the v+ capacitor may be connected to either ground or v cc (polarity reversed.) the charge pump operates with 0.1f capacitors for 3.3v operation. for other supply voltages, see the table for required capacitor values. do not use values smaller than those listed. increasing the capacitor values (e.g., by dou- bling in value) reduces ripple on the transmitter outputs and may slightly reduce power consumption. c2, c3, and c4 can be increased without changing c1s value. c1 c2 c4 c3 v cc -5.5v v + storage capacitor v - storage capacitor c1 c2 c4 c3 v cc v + storage capacitor v - storage capacitor +v cc -v cc -v cc c1 c2 c4 c3 v cc +5.5v v + storage capacitor v - storage capacitor
june 16, 2016 xr32330 10 / 13 exar.com/xr32330 rev 1b for best charge pump efficiency locate the charge pump and bypass capacitors as close as possible to the ic. sur- face mount capacitors are best for this purpose. using capacitors with lower equivale nt series resistance (esr) and self-inductance, along with minimizing parasitic pcb trace inductance will optimize charge pump operation. designers are also advised to consider that capacitor val- ues may shift over time and operating temperature. auto on-line ? circuitry the xr32330 devices have a patent pending auto on- line? circuitry on board that saves power in applications such as hand held and portable systems. the xr32330 devices incorporate an auto on-line? cir- cuit that automatically enables itself when the external transmitters are enabled and the cable is connected. con- versely, the auto on-line? circuit also disables most of the internal circuitry when the device is not being used and goes into a standby mode where the device typically draws 1a. this function is externally controlled by the online pin. when this pin is tied to a logic low, the auto on- line? function is active. once active, the device is enabled until there is no activity on the receiver inputs. the receiver input typically sees at least +3v, which are generated from the transmitters at the other end of the cable with a +5v minimum. when the external transmitters are disabled or the cable is disconnected (see figure 9 ), the receiver inputs will be pulled down by their internal 5k resistors to ground. when this occurs over a period of time, the internal transmitters will be disabled and the device goes into a shutdown or standby mode. when online is high, the auto on- line? mode is disabled. figure 9: auto on-line ? timing the status pin goes to a logic low when the cable is dis- connected or the external transmitters are disabled. when the xr32330 drivers and internal charge pump are disabled, the supply current is reduced to 1a. this can commonly occur in hand-held or portable applications where the rs-232 cable is disconnected or the rs-232 drivers of the connected peripheral are turned off. the auto on-line? mode can be disabled by the shut- down pin. if this pin is a logic low, the auto on-line? function will not operate regard less of the logic state of the online pin. the truth table logic of the xr32330 driver and receiver outputs can be found in table 3 on page 11 . the status pin outputs a logic low signal if no valid rs- 232 level is detected at either of the receiver inputs. this pin goes to a logic high when the external transmitters are enabled and the cable is connected providing valid rs-232 voltage levels to the receiver input pins r1in, r2in and r3in. when the xr32330 is shut down, the charge pumps are turned off. v+ charge pump output decays to v cc , the v- output decays to gnd, see figure 9 . the decay time will depend on the size of capacitors used for the charge pump. once in shutdown, the time required to exit the shut down state and have valid v+ and v- levels is typically 30s. for easy programming, the status can be used to indi- cate dsr or a ring indicator signal. tying online and shutdown together will bypass the auto on-line? cir- cuitry so this connection acts like a shutdown input pin. table 1: minimum recommended charge pump capacitor values supply voltage v cc charge pump capacitor value for xr32330 3.0v to 3.6v c1 - c4 = 0.1 ? f 4.5v to 5.5v c1 = 0.047 ? f, c2 - c4 = 0.33 ? f 3.0v to 5.5v c1 - c4 = 0.22 ? f invalid region rs-232 receiver input voltage t stsl t stsh t offline t online rs-232 driver output voltage status +5v -5v charge pump v+ v- v cc 0v
june 16, 2016 xr32330 11 / 13 exar.com/xr32330 rev 1b table 2: xr32330 operation truth table valid rs-232 level at receiver input shutdown online txout rxout status mode of operation yes l x high-z high-z h manually forced shutdown no l x high-z high-z l manually forced shutdown yes h l active active h normal operation (auto on-line ? enabled) no h l high-z active l standby operation due to auto on-line ? circuitry yes h h active active h normal operation no h h active active l normal operation table 3: xr32330 driver and receiver truth table shutdown rxin rxout txin txout l x high-z x high-z hlhlh hhlhl
june 16, 2016 xr32330 12 / 13 exar.com/xr32330 rev 1b mechanical dimensions 24-pin qfn (4x4mm) ? ?
june 16, 2016 xr32330 13 / 13 exar.com/xr32330 rev 1b for further assistance: email: serialtechsupport@exar.com exar technical documentation: http://www.exar.com/techdoc/ exar corporation headquarters and sales offices 48720 kato road tel: +1 (510) 668-7000 fremont, ca 95438 - usa fax: +1 (510) 668-7001 notice exar corporation reserves the right to make changes to the produc ts contained in this publication in order to improve design, p erformance or reliability. exar corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. charts and schedules contained herein are only for illustration purposes and may vary depending upon a users specific application. while the information in this publication has been carefully checked; no re sponsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its product s in life support applications where the failure or malfunctio n of the product can reasonably be expected to cause failure of the life support system or to significantly af fect its safety or effectiveness. products are not authorized fo r use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user as sumes all such risks; (c) potential liability of exar cor- poration is adequately protected under the circumstances. reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. ordering information revision history part number package green operating temperature range packaging marking xr32330eber-f 24-pin qfn yes -40c to +85c tray 32330eber XR32330EBERTR-F 24-pin qfn yes -40c to +85c tape and reel 32330eber revision date description 1a november 2014 initial release of datasheet. ecn 1446-08 nov 2014 1b june 2016 update tape and reel part number.

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