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exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 description ? full-duplex rs-485 and rs-422 transceivers ? operates from a single +3.3v supply ? interoperable with +5.0v logic ? driver/receiver tri-state enable lines ( sp3491 ) ? -7v to + 2v common-mode input voltage range ? +/-200mv receiver input sensitivity ? allows up to 32 transceivers on the serial bus ? compatability with ltc490 and sn75 79 ( sp3490 ) ? compatability with ltc49 and sn7580 ( sp3491 ) sp3490/sp3491 +3.3v low power full-duplex rs-485 transceivers with 10mbps data rate v cc d r a b z y r gnd 2 1 3 4 5 6 7 8 d the sp3490 and sp3491 devices are +3.3v low power full-duplex transceivers that meet the specifcations of the rs-485 and rs-422 serial protocols. these devices are pin-to-pin compatible with the exar sp490 and sp49 devices as well as popular industry standards. the sp3490 and sp3491 feature exar's bicmos process, allowing low power operation without sacrifcing performance. the sp3490 and sp3491 meet the electrical specifcations of the rs-485 and rs-422 serial protocols up to 0mbps under load. the sp3491 is identical to the sp3490 with the addition of driver and reciveiver tri-state enable lines. sp3490 v cc d r nc a b z y r nc nc de reb gnd gnd 2 1 3 4 5 6 7 8 9 10 11 12 13 14 d sp3491
2 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 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 .....................................................................+6.0v input voltages logic....................................-0.3v to +6.0v drivers.................................-0.3v to +6.0v receivers.........................................+/-4v output voltages drivers.............................................+/-4v receivers............................-0.3v to +6.0v storage temperature.......................-65?c to +150?c power dissipation 8-pin nsoic...................................................600mw (derate 6.90mw/oc above +70oc) 4-pin nsoic.................................................700mw (derate 8.33mw/oc above +70oc) electrical characteristics t amb = t min to t max and v cc = +3.3v +/-5% unless otherwise noted. parameters min. typ. max. units conditions sp3490 driver dc characteristics differential output voltage gnd vcc volts unloaded; r = ? ; figure 1 differential output voltage 2 vcc volts with load; r = 50? (rs-422); figure differential output voltage .5 vcc volts with load; r = 27? (rs-485); figure change in magnitude of driver differential output voltage for complimentary states 0.2 volts r = 27? or r = 50?; figure 1 driver common mode output voltage 3 volts r = 27? or r = 50?; figure 1 input high voltage 2.0 volts input low voltage 0.8 volts input current +/-0 a driver short circuit current v out = high +/-250 ma -7v v o +12v; figure 8 v out = low +/-250 ma -7v v o +12v; figure 8 sp3490 driver ac characteristics max. transmission rate 0 mbps driver input to output, t plh 20 40 60 ns r = 27?, figures 2 & 9 driver input to output, t phl 20 40 60 ns r = 27?, figures 2 & 9 differential driver skew 2 ns |t phl (y)- t plh (y)|, |t phl (z)- t plh (z)|, figures 2 and 9 driver rise or fall time 5 20 ns from 0%-90%; figures 3 and 0
3 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 parameters min. typ. max. units conditions sp3490 receiver dc characteristics differential input threshold -0.2 +0.2 volts -7v v cm +12v input hysteresis 25 mv v cm = 0v output voltage high vcc-0.4 volts i o = -.5ma, v id = +200mv output voltage low 0.4 volts i o = +2.5ma, v id = -200mv input resistance 2 5 k? -7v v cm +12v input current (a, b); v in = 2v +.0 ma v in = 2v input current (a, b); v in = -7v -0.8 ma v in = -7v short circuit current 60 ma 0v v o v cc sp3490 receiver ac characteristics max. transmission rate 0 mbps receiver input to output, t plh 40 70 20 ns figures 6 and 2 receiver input to output, t plh 85 ns t amb = +25c, vcc = 3.3v figures 6 and 2 receiver input to output, t phl 40 70 20 ns figures 6 and 2 receiver input to output, t phl 85 ns t amb = +25c, vcc = 3.3v figures 6 and 2 differential receiver skew 4 ns |t phl (a)- t plh (a)|, |t phl (b)- t plh (b)|, figures 6 and 2 power requirements supply voltage 3.0 3.3 3.6 v supply current 000 2000 a d = 0v or v cc esd protection for d, r, a, b, y and z pins +/-2 kv human body model electrical characteristics t amb = t min to t max and v cc = +3.3v +/-5% unless otherwise noted.
4 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 electrical characteristics t amb = t min to t max and v cc = +3.3v +/-5% unless otherwise noted. parameters min. typ. max. units conditions sp3491 driver dc characteristics differential output voltage gnd vcc volts unloaded; r = ? ; figure 1 differential output voltage 2 vcc volts with load; r = 50? (rs-422); figure differential output voltage .5 vcc volts with load; r = 27? (rs-485); figure change in magnitude of driver differential output voltage for complimentary states 0.2 volts r = 27? or r = 50?; figure 1 driver common mode output voltage 3 volts r = 27? or r = 50?; figure 1 input high voltage 2.0 volts applies to de, d, reb input low voltage 0.8 volts applies to de, d, reb input current +/-0 a applies to de, d, reb driver short circuit current v out = high +/-250 ma -7v v o +12v; figure 8 v out = low +/-250 ma -7v v o +12v; figure 8 sp3491 driver ac characteristics max. transmission rate 0 mbps driver input to output, t plh 20 40 60 ns figures 2 & 9 driver input to output, t phl 20 40 60 ns figures 2 & 9 differential driver skew 2 ns |t phl (y)- t plh (y)|, |t phl (z)- t plh (z)|, figures 2 and 9 driver rise or fall time 5 20 ns from 0%-90%; figures 3 and 0 driver enable to output high 52 20 ns figures 4 and driver enable to output low 60 20 ns figures 5 and driver disable from low 40 20 ns figures 5 and driver disable from high 60 20 ns figures 4 and
5 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 parameters min. typ. max. units conditions sp3491 receiver dc characteristics differential input threshold -0.2 +0.2 volts -7v v cm +12v input hysteresis 25 mv v cm = 0v output voltage high vcc-0.4 volts i o = -.5ma, v id = +200mv output voltage low 0.4 volts i o = +2.5ma, v id = -200mv three-state ( high impedance) output current +/- a 0v v o vcc; reb = vcc input resistance 2 5 k? -7v v cm +12v input current (a, b); v in = 2v +.0 ma de = 0v, v cc = 0v or 3.6v, v in = 2v input current (a, b); v in = -7v -0.8 ma de = 0v, v cc = 0v or 3.6v, v in = -7v short circuit current 60 ma 0v v o v cc sp3491 receiver ac characteristics max. transmission rate 0 mbps reb = 0v, de = 0v receiver input to output, t plh 40 70 20 ns figures 6 and 2 receiver input to output, t plh 85 ns t amb = +25c, vcc = 3.3v, figures 6 and 2 receiver input to output, t phl 40 70 20 ns figures 6 and 2 receiver input to output, t phl 85 ns t amb = +25c, vcc = 3.3v, figures 6 and 2 differential receiver skew 4 ns |t phl (a)- t plh (a)|, |t phl (b)- t plh (b)|, figures 6 and 2 receiver enable to output low 65 50 ns figures 7 and 3; s closed, s 2 open receiver enable to output high 65 50 ns figures 7 and 3; s 2 closed, s open receiver disable from low 65 200 ns figures 7 and 3; s closed, s 2 open receiver disable from high 65 200 ns figures 7 and 3; s 2 closed, s open power requirements supply voltage +3.0 +3.6 v supply current 000 2000 a reb, d = 0v or v cc ; de = v cc supply current 800 500 a de = 0v esd protection for r, d, de, reb, a, b, y and z pins +/-2 kv human body model electrical characteristics t amb = t min to t max and v cc = +3.3v +/-5% unless otherwise noted.
6 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 pin function v cc d r a b z y r gnd 2 1 3 4 5 6 7 8 d pin - vcc - positive supply +3.00v < vcc < +3.60v pin 2 - r - receiver output pin 3 - d - driver input pin 4 - gnd - ground connection pin 5 - y - non-inverting driver output pin 6 - z - inverting driver output pin 7 - b - inverting receiver input pin 8 - a - non-inverting receiver input sp3490 pin function sp3490 v cc d r nc a b z y r nc nc de reb gnd gnd 2 1 3 4 5 6 7 8 9 10 11 12 13 14 d pin - nc - no connect pin 2 - r - receiver output pin 3 - reb - receiver cutput enable active low pin 4 - de - driver output enable active high pin 5 - d - driver input pin 6 - gnd - ground connection pin 7 - gnd - ground connection pin 8 - nc - no connect pin 9 - y - non-inverting driver output pin 0 - z - inverting driver output pin - b - inverting receiver input pin 2 - a - non-inverting receiver input pin 3 - nc - no connect pin 4 - vcc - positive supply +3.00v < vcc < +3.60v sp3491 pin function sp3491
7 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 test circuits r r v oc d vcc v od figure . driver dc test load circuit generator (note 1) 50? c l out d v cc r l = 60? c l = 15pf (note 2) figure 3. driver differential output delay and transition time circuit. generator (note 1) 50? s1 r l = 110? out c l = 50pf (note 2) v om = 1.5v v oh + v ol 2 d figure 4. driver enable and disable timing circuit, output high figure 2. driver propagation delay test circuit generator (note 1) 50? v cc s1 v dm r l = 27? ou t c l = 15p f (note 2) v om = 1.5 v v oh + v ol 2 d figure 5. driver enable and disable timing circuit, output low generato r (note 1) 50? s1 r l = 110? out c l = 50p f (note 2) d 0v or 3v v cc generator (note 1) 50? 1.5v 0v v id r ou t c l = 15pf (note 2 ) v om = v cc 2 figure 6. receiver propagation delay test circuit 1.5v -1.5v s3 v id generato r (note 1) 50? c l = 15pf (note 2) r 1k s1 s2 v cc a/y d di = 0 or vcc b/z de = 0 or vcc i os d 100? -7v to +12v v figure 7. receiver enable and disable timing circuit figure 8. driver short circuit current limit test
8 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 figure 9. driver propagation delay waveforms 0v v oh t plh t phl v om t phl t plh 3v v ol v oh 1.5v 1.5v input y output v om z output v ol v om v om v om = v oh + v ol 2 1.5v switching waveforms figure 3. receiver enable and disable waveforms in 1.5v t do1 1.5v t do2 3v 0v out 50% 50% 10% 10% 90% 90% t td t td 2.0v -2.0v figure 0. driver differential output delay and transition time waveforms 0v v oh t pzh 0.25v t phz v om t pzl t plz 3v v ol v cc 1.5v 1.5v de output high v om 0.25v 0v output lo w v om = v oh + v ol 2 1.5v 3v 0v v cc t rplh 1.5v t rphl v om v om 0v 1.5v input output v om = v cc 2 figure 2. receiver propagation delay waveforms figure . driver enable and disable timing waveforms 3v 0v t prhz 1.5v t przh t prsh 1.5v 1.5v 10% 0v v oh reb output s1 is open s2 is closed s3 = 1.5 v 3v 0v t prlz 1.5v t przl t prsl 1.5v 1.5v 10% v cc reb output s1 is closed s2 is open s3 = -1.5v v ol note : the input pulse is supplied by a generator with the following characteristics: prr = 250khz, 50% duty cycle, t r < 6.0ns, z o = 50?. note 2: c l includes probe and stray capacitance.
9 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 the sp3490 and sp3491 are two members in the family of +3.3v low power full-du - plex transceivers that meet the electrical specifcations of the rs-485 and rs-422 serial protocols. these devices are pin-to- pin compatible with the exar sp490 and sp49 devices as well as popular industry standards. the sp3490 and sp3491 feature exar's bicmos process allowing low power operation without sacrifcing performance. 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 the drivers for both the sp3490 and sp3491 have differential outputs. the typical voltage output swing with no load will be 0 volts to vcc. with worst case loading of 54? across the differential outputs, the drivers can maintain greater than .5v voltage levels. the driver of the sp3491 has a driver en - able control line which is active high. a logic high on de (pin 4) of the sp3491 will enable the differential driver outputs. a logic low on the de(pin 4) will tri-state the driver outputs. the sp3490 does not have a driver enable. receivers the receivers of the sp3490 and sp3491 have differential inputs with an input sensi - tivity of 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 for both the sp3490 and sp3491 are equipped with a fail-safe feature that guarantees the receiver output will be in a high state when the input is left unconnected. the receiver of the sp3491 has a enable control line which is active low. a logic low on reb (pin 3) of the sp3491 will en - able the differential receiver. a logic high on reb (pin 3) of the sp3491 will tri-state the receiver. description
0 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270
exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270
2 exar corporation 48720 kato road, fremont ca, 94538 ? 50-668-70 7 ? www.exar.com sp3490_349_02_0270 ordering information model temperature range package types SP3490CN-L ....................................................................... 0c to +70c ................................................................................................ 8-pin nsoic SP3490CN-L/tr ................................................................. 0c to +70c ................................................................................................ 8-pin nsoic sp3490en-l...................................................................... -40c to +85c...............................................................................................8-pin nsoic sp3490en-l/tr................................................................. -40c to +85c.............................................................................................8-pin nsoic sp349cn-l ....................................................................... 0c to +70c .............................................................................................. 4-pin nsoic sp349cn-l/tr ................................................................. 0c to +70c .............................................................................................. 4-pin nsoic sp349en-l...................................................................... -40c to +85c.............................................................................................4-pin nsoic sp349en-l/tr................................................................. -40c to +85c............................................................................................4-pin nsoic revision history date revision description 0/ /02 -- legacy sipex datasheet 06/08/0 .0.0 convert to exar format. update ordering information as a result of discontinued lead type package options per pdn 08 26-0. change revision to .0.0. add new figure 8 - driver short circuit current limit test circuit 9/4/0 .0. correct package type for sp349 options in ordering table from 8 pin nsoic to 4 pin nsoic 0/27/0 .0.2 add esd protection levels of +/-2kv. remove sp3490 supply current rating for de = 0v (no driver enable for sp3490). 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 october 200 for technical support please email exar's serial technical support group at: serialtechsupport@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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