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exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 features ? +5v only ? low power bicmos ? driver/receiver enable (sp49e) ? rs-485 and rs-422 drivers/receivers ? pin compatible with ltc490 and sn7579 (sp490e) ? pin compatible with ltc49 and sn7580 (sp49e) ? improved esd specifcations: 5kv human body model 5kv iec6 000-4-2 air discharge 8kv iec6000-4-2 contact discharge the sp490e is a low power differential line driver/receiver meeting rs-485 and rs-422 standards up to 0mbps. the SP491E is identical to the sp490e with the addition of driver and receiver tri-state enable lines. both products feature 200mv receiver input sensitivity, over wide common mode range. the sp490e is available in 8-pin plastic dip and 8-pin nsoic packages for operation over the commercial and industrial temperature ranges. the SP491E is available in 4-pin dip and 4-pin nsoic packages for operation over the commercial and industrial temperature ranges. sp490e SP491E description block diagrams now available in lead free packaging enhanced full duplex rs-485 transceivers sp490e/491e
2 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 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 ....................................................................................................+7v input voltages drivers................................................-0.5v to (v cc +0.5v) receivers..................................................................4v output voltages drivers......................................................................4v receivers...........................................-0.5v to (v cc +0.5v) storage temperature....................................................-65?c to +150? power dissipation.....................................................................000mw parameters min. typ. max. units conditions sp490e driver dc characteristics differential output voltage gnd v cc volts unloaded; r = ; see fgure 1 differential output voltage 2 v cc volts with load; r = 50?; (rs422); see fgure 1 differential output voltage .5 v cc volts with load; r = 27?; (rs485); see fgure 1 change in magnitude of driver differential output voltage for complimentary states 0.2 volts r = 27? or r = 50?; see fgure 1 driver common-mode output voltage 3 volts r = 27? or r = 50?; see fgure 1 input high voltage 2.0 volts applies to d input low voltage 0.8 volts applies to d input current 0 a applies to d driver short-circuit current v out = high 250 ma - 7v v o +12v v out = low 250 ma - 7v v o +12v sp490e driver ac characteristics maximum data rate 0 mbps driver input to output 30 60 ns t plh ; r diff = 54?, c l = c l2 = 00pf; see fgures 3 and 5 driver input to output 30 60 ns t phl ; r diff = 54?, c l = c l2 = 00pf; see fgures 3 and 5 driver skew 5 ns see fgures 3 and 5, t skew = | t dplh - t dphl | driver rise or fall time 5 40 ns from 0% to 90%; r diff = 54?, c l = c l2 = 00pf; see fgures 3 and 5 sp490e receiver dc characteristics differential input threshold -0.2 +0.2 volts - 7v v cm 12v input hysteresis 70 mv v cm = 0v output voltage high 3.5 volts i o = -4ma, v id = +200mv output voltage low 0.4 volts i o = +4ma, v id = -200mv input resistance 12 15 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 85 ma 0v v o v cc electrical characteristics t min to t max and v cc = 5v 5% unless otherwise noted.
3 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 t min to t max and v cc = 5v 5% unless otherwise noted. parameters min. typ. max. units conditions sp490e receiver ac characteristics maximum data rate 0 mbps receiver input to output 20 45 00 ns t plh ; r diff = 54?, c l = c l2 = 00pf; figures 3 & 7 receiver input to output 20 45 00 ns t phl ; r diff = 54?, c l = c l2 = 00pf; figures 3 & 7 diff. receiver skew it plh -t phl i 3 ns r diff = 54?; c l = c l2 = 00pf; figures 3 & 7 power requirements supply voltage +4.75 +5.25 volts supply current 900 a environmental and mechanical operating temperature commercial (_c_) 0 +70 c industrial (_e_) -40 +85 c storage temperature -65 +50 c package plastic dip (_p) nsoic (_n) figure 3. driver/receiver timing test circuit figure 4. driver timing test load #2 circuit figure . driver dc test load circuit figure 2. receiver timing test load circuit electrical characteristics
4 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 figure 5. driver propagation delays figure 6. driver enable and disable times figure 7. receiver propagation delays
5 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 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 ...................................................................................................+7v input voltages logic.................................................-0.5v to (v cc +0.5v) drivers..............................................-0.5v to (v cc +0.5v) receivers................................................................14v output voltages logic................................................-0.5v to (v cc +0.5v) drivers....................................................................14v receivers.........................................-0.5v to (v cc +0.5v) storage temperature.....................................................-65?c to +150 power dissipation.................................................................1000mw t min to t max and v cc = 5v 5% unless otherwise noted. parameters min. typ. max. units conditions SP491E driver dc characteristics differential output voltage gnd v cc volts unloaded; r = ; see fgure 1 differential output voltage 2 v cc volts with load; r = 50?; (rs422); see fgure 1 differential output voltage .5 v cc volts with load; r = 27?; (rs485); change in magnitude of driver differential output voltage for complimentary states 0.2 volts r = 27? or r = 50?; see fgure 1 driver common-mode output voltage 3 volts r = 27? or r = 50?; see fgure 1 input high voltage 2.0 volts applies to d, re, de input low voltage 0.8 volts applies to d, re, de input current 0 a applies to d, re, de driver short-circuit current v out = high 250 ma - 7v v o 12v v out = low 250 ma - 7v v o 12v SP491E driver ac characteristics maximum data rate 0 mbps re = 5v, de = 5v driver input to output 30 60 ns t plh ; r diff = 54?, c l = c l2 = 00pf; vhhxuhvdg driver input to output 30 60 ns t phl ; r diff = 54?, c l = c l2 = 00pf; vhhxuhvdg driver skew 5 0 ns vhhxuhvdg t skew = | t dplh - t dphl | driver rise or fall time 5 40 ns from 0% to 90%; r diff = 54?, c l = c l2 = 00pf; vhhxuhvdg driver enable to output high 40 70 ns c l = c l2 = 00pf; vhhxuhv 4 and 6; s 2 closed driver enable to output low 40 70 ns c l = c l2 = 00pf; vhhxuhv 4 and 6; s closed driver disable time from low 40 70 ns c l = c l2 = 00pf; vhhxuhv 4 and 6; s closed driver disable time from high 40 70 ns c l = c l2 = 00pf; vhhxuhv 4 and 6; s 2 closed electrical characteristics
6 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 t min to t max and v cc = 5v 5% unless otherwise noted. parameters min. typ. max. units conditions SP491E receiver dc characteristics differential input threshold -0.2 +0.2 volts - 7v v cm 12v input hysteresis 70 mv v cm = 0v output voltage high 3.5 volts i o = -4ma, v id = +200mv output voltage low 0.4 volts i o = +4ma, v id = -200mv three state (high impedance) output current 1 a 0.4v v o 2.4v; re = 5v input resistance 12 15 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 85 ma 0v v o v cc SP491E receiver ac characteristics maximum data rate 0 mbps re = 0v receiver input to output 20 45 00 ns t plh ; r diff = 54?, c l = c l2 = 00pf; figures 3 & 7 receiver input to output 20 45 00 ns t phl ; r diff = 54?, c l = c l2 = 00pf; figures 3 & 7 diff. receiver skew it plh -t phl i 3 ns r diff = 54?; c l = c l2 = 00pf; figures 3 & 7 receiver enable to output low 45 70 ns c rl = 5pf; figures 2 and 8; s closed receiver enable to output high 45 70 ns c rl = 5pf; figures 2 and 8; s 2 closed receiver disable from low 45 70 ns c rl = 5pf; figures 2 and 8; s closed receiver disable from high 45 70 ns c rl = 5pf; figures 2 and 8; s 2 closed power requirements supply voltage +4.75 +5.25 volts supply current 900 a re, d = 0v or v cc ; de = v cc SP491E environmental and mechanical operating temperature commercial (_c_) 0 +70 c industrial (_e_) -40 +85 c storage temperature -65 +50 c package plastic dip (_p) nsoic (_n) figure 8. receiver enable and disable times electrical characteristics
7 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 description t h e s p 4 9 0 e a n d s p 4 9 1 e a r e f u l l - d u p l e x d i ff e r e n t i a l t r a n s c e i v - ers that meet the requirements of rs-485 and rs-422. fabricated with a exar proprietary bicmos process, both products require a fraction of the power of older bi - polar designs. the rs-485 standard is ideal for multi-drop applications or for long-distance interfaces. rs-485 allows up to 32 drivers and 32 receivers 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) com - mon mode range to accommodate ground potential differences. because rs-485 is a differential interface, data is virtually immune to noise in the transmission line. driver... the drivers for both the sp490e and SP491E have differential outputs. 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 driver can maintain greater than .5v voltage levels. the driver of the SP491E has a driver enable control line which is active high. a logic high on de (pin 4) of the SP491E will enable the differential driver outputs. a logic low on de (pin 4) of the SP491E will tri-state the driver outputs. the sp490e does not have a driver enable. receiver... the receivers for both the sp490e and SP491E have differential 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 be - tween systems. the receivers for both the sp490e and SP491E are 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. the receiver of the SP491E has a receiver enable control line which is active low. a logic low on reb (pin 3) of the SP491E will enable the differential receiver. a logic high on reb (pin 3) of the SP491E will tri-state the re - ceiver.
8 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 esd t olerance the sp490e/sp49 e devices incorporates ruggedized esd cells on all driver output and receiver input pins. the esd structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. the improved esd tolerance is at least 5kv without damage nor latch-up. there are different methods of esd testing applied: a) mil-std-883, method 305.7 b) iec6 000-4-2 air-discharge c) iec6000-4-2 direct contact the human body model has been the generally accepted esd testing method for semiconductors. this method is also specifed in mil-std-883, method 3015.7 for esd testing. the premise of this esd test is to simulate the human bodys potential to store electro-static energy and discharge it to an integrated circuit. the simulation is performed by using a test model as shown in figure 9. this method will test the ics capability to withstand an esd transient during normal handling such as in manu - facturing areas where the ics tend to be handled frequently. the iec-6 000-4-2, formerly iec80 -2, is generally used for testing esd on equipment and systems. for system manufacturers, they must guarantee a certain amount of esd protection since the system itself is exposed to the outside environment and human pres - ence. the premise with iec6 000-4-2 is that the system is required to withstand an amount of static electricity when esd is applied to points and surfaces of the equipment that are accessible to personnel during normal usage. the transceiver ic receives most of the esd current when the esd source is applied to the connector pins. the test circuit for iec6 000-4-2 is shown on figure 0. there are two methods within iec6 000-4-2, the air discharge method and the contact discharge method. with the air discharge method, an esd voltage is applied to the equipment under test (eut) through air. this simulates an electrically charged person ready to connect a cable onto the rear of the system only to fnd an unpleasant zap just before the person touches the back panel. the high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. this energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. variables with an air discharge such as approach speed of the object carrying the esd potential to the system and humidity will tend to change the discharge current. for example, the rise time of the discharge current varies with the approach speed. the contact discharge method applies the esd current directly to the eut. this method was devised to reduce the unpredictability of the esd arc. the discharge current rise time is constant since the energy is directly transferred without the air-gap arc. in situ - ations such as hand held systems, the esd charge can be directly discharged to the equipment from a person already holding the equipment. the current is transferred on to the keypad or the serial port of the equipment directly and then travels through the pcb and fnally to the ic. the circuit model in figures 9 and 0 repre - sent the typical esd testing circuit used for all three methods. the c s is initially charged with the dc power supply when the frst switch (sw ) is on. now that the capacitor is charged, the second switch (sw2) is on while sw switches off. the voltage stored in the capacitor is then applied through r s , the current limiting resistor, onto the device under test (dut). in esd tests, the sw2 switch is pulsed so that the device under test receives a duration of voltage.
9 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 for the human body model, the current limiting resistor (r s ) and the source capacitor (c s ) are 1.5k? an 100pf, respectively. for iec-6 000-4-2, the current limiting resistor (r s ) and the source capacitor (c s ) are 330? an 50pf, respectively. figure . esd test waveform for iec6000-4-2 t = 0ns t = 30ns 0a 15a 30a i t figure 9. esd test circuit for human body model figure 0. esd test circuit for iec6000-4-2 r c devic e under test dc power sourc e c s r s sw1 sw2 r s and r v add up to 330 for iec61000-4-2. r c devic e under test dc power sourc e c s r s sw1 sw2 r v contact-discharge model the higher c s value and lower r s value in the iec6 000-4-2 model are more stringent than the human body model. the larger storage capacitor injects a higher voltage to the test point when sw2 is switched on. the lower current limiting resistor increases the current charge onto the test point.
0 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 human body iec61000-4-2 model air discharge direct contact level driver outputs 5kv 5kv 8kv 4 receiver inputs 5kv 5kv 8kv 4 sp490e, s p491e family tabke . transceiver esd tolerance levels
exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 p ackage: 8 pin nsoic
2 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 p ackage: 14 pin nsoic
3 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 p ackage: 8 pin pdip
4 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 p ackage: 14 pin pdip
5 exar corporation 48720 kato road, fremont ca, 94538 ? (50)668-70 7 ? www.exar.com sp490e,49e_00_0527 model temperature range package sp490ecn-l. ................................................................................. 0?c to +70?c ............................................................................... 8-pin nsoic sp490ecn-l/tr ............................................................................ 0?c to +70?c ............................................................................... 8-pin nsoic sp490ecp-l .................................................................................. 0?c to +70?c ................................................................................. 8-pin pdip sp490een-l ................................................................................ -40?c to +85?c .............................................................................. 8-pin nsoic sp490een-l/tr .......................................................................... -40?c to +85?c .............................................................................. 8-pin nsoic sp490eep-l ................................................................................ -40?c to +85?c ................................................................................ 8-pin pdip sp49ecn-l .................................................................................. 0?c to +70?c .............................................................................. 4-pin nsoic sp49ecn-l/tr ............................................................................ 0?c to +70?c .............................................................................. 4-pin nsoic sp49ecp-l .................................................................................. 0?c to +70?c ................................................................................ 4-pin pdip sp49een-l ................................................................................ -40?c to +85?c ............................................................................. 4-pin nsoic sp49een-l/tr .......................................................................... -40?c to +85?c ............................................................................. 4-pin nsoic sp49eep-l ................................................................................ -40?c to +85?c ............................................................................... 4-pin pdip note: /tr = tape and reel ordering information 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 20 exar corporation datasheet may 20 send your serial transceiver technical inquiry with technical details to: serialtechsupport@exar .com reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. revision history date revision description 2000 4 sipex legacy data sheet may 20 .0.0 convert to exar format. remove driver propagation delay minimum and driver rise/fall time minimum entry for sp490e and sp49e. update esd rating to iec6000-4-2. update ordering information.

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