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exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_sp485_00_0740 description features ? +5v only ? low power bicmos ? driver / receiver enable ? slew rate limited driver for low emi (sp483) ? low power shutdown mode (sp483) ? rs-485 and rs-422 drivers/receivers sp483 / sp485 low power half-duplex rs-485 transceivers the sp483 and sp485 are a family of half-duplex transceivers that meet the specifcations of rs-485 and rs-422. their bicmos design allows low power operation without sacrifcing performance. the sp485 meets the requirements of rs-485 and rs-422 up to 5mbps. ad - ditionally, the sp483 is equipped with a low power shutdown mode. the sp483 is internally slew rate limited to reduce emi and can meet the requirements of rs-485 and rs-422 up to 250kbps.
2 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_485_00_0740 absolute maximum ratings these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifcations below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. v cc ......................................................................+2v input voltages logic.........................-0.3v to (vcc + 0.5v) drivers......................-0.3v to (vcc + 0.5v) receivers.........................................+/-5v electrical characteristics t min to t max and v cc = 5v +/-5% unless otherwise noted. parameters min. typ. max. units conditions sp483/sp485 driver dc characteristics differential output voltage vcc volts unloaded; r = ; see fgure 1 differential output voltage 2 vcc volts with load; r = 50? (rs-422); see figure differential output voltage .5 vcc volts with load; r = 27? (rs-485); see figure change in magnitude of driver differential output voltage for complimentary states 0.2 volts r = 27? or r = 50?; see figure 1 driver common mode output voltage 3 volts r = 27? or r = 50?; see figure 1 input high voltage 2.0 volts applies to de, di, re input low voltage 0.8 volts applies to de, di, re input current +/-0 a applies to de, di, re driver short circuit current, v out = high 35 250 ma -7v v o +12v driver short circuit current, v out = low 35 250 ma -7v v o +12v sp485 driver ac characteristics maximum data rate 5 mbps re = 5v, de = 5v driver input to output, t plh 30 60 ns figures 3 and 5, r diff = 54?, c l = c l2 = 00pf driver input to output, t phl 30 60 ns figures 3 and 5, r diff = 54?, c l = c l2 = 00pf driver skew 5 0 ns figures 3 and 5, t skew = |t dphl - t dplh | driver rise or fall time 5 40 ns from 0%-90%; r diff = 54? c l = c l2 = 100pf; see fgures 3 and 5 output voltages logic.........................-0.3v to (vcc + 0.5v) drivers.............................................+/-5v receivers..................-0.3v to (vcc + 0.5v) storage temperature.......................-65?c to +150?c power dissipation 8-pin nsoic...................................................500mw
3 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_sp485_00_0740 parameters min. typ. max. units conditions sp485 driver (continued) ac characteristics driver enable to output high 40 70 ns c l = 100pf, see fgures 4 and 6, s 2 closed driver enable to output low 40 70 ns c l = 100pf, see fgures 4 and 6, s closed driver disable time from high 40 70 ns c l = 15pf, see fgures 2 and 8, s 2 closed driver disable time from low 40 70 ns c l = 15pf, see fgures 2 and 8, s closed sp483/sp485 receiver dc characteristics differential input threshold -0.2 +0.2 volts -7v v cm +12v input hysteresis 0 mv v cm = 0v output voltage high 2.4 5 volts i o = -4ma, v id = +200mv output voltage low 0.0 0.4 volts i o = +4ma, v id = -200mv three-state ( high impedance) output current +/- a 0.4v v o 2.4v; re = 5v input resistance 5 k? -7v v cm +12v input current (a, b); v in = 2v +.0 ma de = 0v, v cc = 0v or 5.25v, v in = 2v input current (a, b); v in = -7v -0.8 ma de = 0v, v cc = 0v or 5.25v, v in = -7v short-circuit current 95 ma 0v v cm v cc sp485 receiver ac characteristics maximum data rate 5 mbps re = 0v, de = 0v receiver input to output 60 90 200 ns t plh ; figures 3 and 7, r diff = 54?, c l = c l2 = 00pf receiver input to output 60 90 200 ns t phl ; figures 3 and 7, r diff = 54?, c l = c l2 = 00pf differential receiver skew |t phl - t plh | 3 ns r diff = 54?, c l = c l2 = 00pf, figures 3 and 7 receiver enable to output low 20 50 ns c rl = 5pf, figures 2 and 8; s closed receiver enable to output high 20 50 ns c rl = 5pf, figures 2 and 8; s 2 closed receiver disable from low 20 50 ns c rl = 5pf, figures 2 and 8; s closed receiver disable from high 20 50 ns c rl = 5pf, figures 2 and 8; s 2 closed electrical characteristics t min to t max and v cc = 5v +/-5% unless otherwise noted.
4 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_485_00_0740 parameters min. typ. max. units conditions power requirements supply voltage v cc +4.75 +5.25 volts supply current sp485 900 a no load; re, di = 0v or v cc ; de = v cc 900 a no load; re = 0v, di = 0v or 5v; de = 0v sp483 600 a no load; re, di = 0v or v cc ; de = v cc 600 a no load; re = 0v, di = 0v or 5v; de = 0v sp483 0 a shutdown mode; de = 0v, re = v cc environmental and mechanical operating temperature commercial (_c_) 0 70 oc industrial (_e_) -40 +85 oc storage temperature -65 +50 oc package: plastic dip (_p), nsoic (_n) electrical characteristics t min to t max and v cc = 5v +/-5% unless otherwise noted.
5 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_sp485_00_0740 parameters min. typ. max. units conditions sp483 driver ac characteristics maximum date rate 250 kbps driver input to output, t plh 250 800 2000 ns t plh ; r diff = 54?, c l = c l2 = 00pf, see fgures 3 and 5 driver input to output, t phl 250 800 2000 ns t phl ; r diff = 54?, c l = c l2 = 00pf, see fgures 3 and 5 driver skew 00 800 ns see fgures 3 and 5, t skew = |t dphl - t dplh | driver rise or fall time 250 2000 ns from 0%-90%; r diff = 54? c l = c l2 = 00pf; see figures 3 and 5 driver enable to output high 250 2000 ns c l = 100pf, see fgures 4 and 6, s 2 closed driver enable to output low 250 2000 ns c l = 100pf, see fgures 4 and 6, s closed driver disable time from high 300 3000 ns c l = 15pf, see fgures 4 and 6, s 2 closed driver disable time from low 300 3000 ns c l = 15pf, see fgures 4 and 6, s closed sp483 receiver ac characteristics maximum data rate 250 kbps receiver input to output 250 2000 ns t plh , t phl ; figures 3 and 7: r diff = 54?, c l = c l2 = 00pf differential receiver skew |t phl - t plh | 00 ns r diff = 54?, c l = c l2 = 00pf, see figures 3 and 7 receiver enable to output low 20 50 ns c rl = 5pf, figures 2 and 8; s closed receiver enable to output high 20 50 ns c rl = 5pf, figures 2 and 8; s 2 closed receiver disable from low 20 50 ns c rl = 5pf, figures 2 and 8; s closed receiver disable from high 20 50 ns c rl = 5pf, figures 2 and 8; s 2 closed sp483 shutdown timing time to shutdown 50 200 600 ns re = 5v, de = 0v driver enable from shutdown to output high 2000 ns c l = 00pf; see figures 4 and 6; s 2 closed driver enable from shutdown to output low 2000 ns c l = 00pf; see figures 4 and 6; s closed receiver enable from shutdown to output high 2500 ns c l = 5pf; see figures 4 and 6; s 2 closed receiver enable from shutdown to output low 2500 ns c l = 5pf; see figures 4 and 6; s closed t min to t max and v cc = 5v +/-5% unless otherwise noted. electrical characteristics
6 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_485_00_0740 pin function test circuits a b r r v od v oc figure . driver dc test load circuit c l1 15pf ro a b a b di c l2 r l figure 3. rs-485 driver/receiver timing test 500? c l output under test s 1 s 2 v cc figure 4. driver timing test load #2 circuit figure 2. receiver timing test load circuit 1k? 1k? c rl receiver output s 1 s 2 test point v cc pin - ro - receiver output pin 2 - re - receiver output enable active low pin 3 - de - driver output enable active high pin 4 - di - driver input pin 5 - gnd - ground connection pin 6 - a - driver output / receiver input non-inverting pin 7 - b - driver output / receiver input inverting pin 8 - vcc - positive supply 4.75v vcc 5.25v figure 5. driver propagation delays +3v 0v driver input a b driver output v o + differential output v a ? v b 0v v o ? 1.5v 1.5v t plh t f t r f sp485 = 1mhz; t r 10ns ; t f 10ns v o 1/2v o 1/2v o t phl t skew = |t dplh - t dphl | t dplh t dphl f sp483 = 100khz;
7 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_sp485_00_0740 figure 6. driver enable and disable times figure 8. receiver enable and disable times +3v 0v de 5v v ol a , b 0v 1.5v 1.5v t zl t zh v oh a , b 2.3v 2.3v t lz t hz 0.5v 0.5v output nor mally low output nor mally high f sp485 = 1mhz; t r 10ns ; t f 10ns f sp483 = 100khz; switching waveforms function truth t ables inputs outputs re de di line condition a b x no fault 0 x 0 no fault 0 x 0 x x z z x x fault z z table . transmit function truth table inputs outputs re de a - b r 0 0 +0.2v 0 0 -0.2v 0 0 0 inputs open 0 x z table 2. receive function truth table v oh v ol r 1.5v 1.5v t phl output v od2 + v od2 ? a ? b 0v 0v t plh input f sp485 = 1mhz; t r 10ns ; t f 10ns f sp483 = 100khz; t skew = |t plh - t phl | +3v 0v 5v 0v 1.5v 1.5v t zl t zh r 1.5v 1.5v t lz t hz 0.5v 0.5v output nor mally low output nor mally high v il v ih r re f sp485 = 1mhz; t r 10ns ; t f 10ns f sp483 = 100khz; figure 7. receiver propagation delays
8 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_485_00_0740 the sp483 and sp485 are half-duplex dif - ferential transceivers that meet the require - ments of rs-485 and rs-422. fabricated with an exar proprietary bicmos process, this product requires a fraction of the power of older bipolar designs. the rs-485 standard is ideal for multi-drop applications and for long-distance interfaces. rs-485 allows up to 32 drivers and 32 receiv - ers to be connected to a data bus, making it an ideal choice for multi-drop applications. since the cabling can be as long as 4,000 feet, rs-485 transceivers are equipped with a wide (-7v to + 2v) common mode range to accommodate ground potential differ - ences. because rs-485 is a differential interface, data is virtually immune to noise in the transmission line. drivers sp483 and sp485 the driver outputs of the sp483 and sp485 are differential outputs meeting the rs-485 and rs-422 standards. the typical voltage output swing with no load will be 0 volts to +5 volts. with worst case loading of 54? across the differential outputs, the drivers can maintain greater than .5v voltage levels. the drivers of the sp483 and sp485 have an enable control line which is active high. a logic high on de (pin 3) will enable the differential driver outputs. a logic low on the de(pin 3) will tri-state the driver outputs. the transmitters of the sp485 will operate up to at least 5mbps. the sp483 has internally slew rate limited driver outputs to minimize emi. the maximum data rate for the sp483 driver is 250kbps. receivers sp483 and sp485 the sp483 and sp485 receivers have dif - ferential inputs with an input sensitivity as low as 200mv. input impedance of the receivers is typically 15k? (12k? minimum). a wide common mode range of -7v to + 2v allows for large ground potential differences between systems. the receivers of the sp483 and sp485 have a tri-state enable control pin. a logic low on re (pin 2) will enable the receiver, a logic high on re (pin 2) will disable the receiver. the receiver for the sp485 will operate up to at least 0mbps. the sp483 receiver is rated for data rates up to 250kbps. the receiver for each of the three devices is equipped with the fail-safe feature. fail- safe guarantees that the receiver output will be in a high state when the input is left unconnected and foating. shutdown mode sp483 the sp483 is equipped with a shutdown mode. to enable the shutdown state, both driver and receiver must be disabled simul - taneously. a logic low on de (pin 3) and a logic high on re (pin 2) will put the sp483 into shutdown mode. in shutdown, supply current will drop to typically a. description
9 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_sp485_00_0740
0 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_485_00_0740
exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp483_sp485_00_0740 ordering information model temperature range package types sp483cn-l ......................................................................... 0c to +70c ................................................................................................ 8-pin nsoic sp483cn-l/tr ................................................................... 0c to +70c ................................................................................................ 8-pin nsoic sp483cs-l.......................................................................... 0c to +70c................................................................................................8-pin pdip sp483en-l........................................................................ -40c to +85c...............................................................................................8-pin nsoic sp483en-l/tr.................................................................. -40c to +85c...............................................................................................8-pin nsoic sp483es-l........................................................................ -40c to +85c...............................................................................................8-pin pdip sp485cn-l ......................................................................... 0c to +70c .................................................................................. ..............8-pin nsoic sp485cn-l/tr ................................................................... 0c to +70c ............................................................................................. ...8-pin nsoic sp485cs-l......................................................................... 0c to +70c.................................................................................................8-pin pdip SP485EN-L........................................................................ -40c to +85c...............................................................................................8-pin nsoic SP485EN-L/tr.................................................................. -40c to +85c...............................................................................................8-pin nsoic sp485es-l........................................................................ -40c to +85c...............................................................................................8-pin pdip revision histor y date revision description 07/28/04 -- legacy sipex datasheet 07/4/0 .0.0 convert to exar format. update ordering information as a result of discontinued lead type package options per pdn 08 26-0. remove all options and reference to sp48; part is eol. remove "gnd" entry from minimum column of sp483/485 driver dc characteristic paramter "differntial output voltage - unloaded". notice exar corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil - ity. exar corporation assumes 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 user's specifc application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to signifcantly af fect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circumstances. copyright 200 exar corporation datasheet july 200 send your interface technical inquiry with technical details to: uarttechsupport@exar.com reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. note: /tr = tape and reel

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