1 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation SP490/sp491 full duplex rs-485 transceivers n +5v only n low power bicmos n driver/receiver enable ( sp491 ) n rs-485 and rs-422 drivers/receivers n pin compatible with ltc490 and sn75179 ( SP490 ) n pin compatible with ltc491 and sn75180 ( sp491 ) description the SP490 is a low power differential line driver/receiver meeting rs-485 and rs-422 standards up to 5mbps. the sp491 is identical to the SP490 with the addition of driver and receiver tri-state enable lines. both products feature 200mv receiver input sensitivity, over wide common mode range. the SP490 is available in 8-pin plastic dip and 8-pin nsoic packages for operation over the commercial and industrial temperature ranges. the sp491 is available in 14-pin dip and 14-pin nsoic packages for operation over the commercial and industrial temperature ranges. 6 1 2 3 4 5 7 8 vcc gnd r d a b z y r d 9 10 11 12 13 14 nc reb de gnd nc nc 1 2 3 4 5 6 7 8 r d vcc gnd r d a b z y SP490 sp491
2 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation 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 specifications 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.................................................................. 14v output voltages drivers...................................................................... 14v receivers...........................................-0.5v to (v cc +0.5v) storage temperature....................................................-65?c to +150? power dissipation.....................................................................1000mw specifications t min to t max and v cc = 5v 5% unless otherwise noted. parameters min. typ. max. units conditions SP490 driver dc characteristics differential output voltage gnd v cc volts unloaded; r = ; see figure 1 differential output voltage 2 v cc volts with load; r = 50 w ; (rs422); see figure 1 differential output voltage 1.5 v cc volts with load; r = 27 w ; (rs485); see figure 1 change in magnitude of driver differential output voltage for complimentary states 0.2 volts r = 27 w or r = 50 w ; see figure 1 driver common-mode output voltage 3 volts r = 27 w or r = 50 w ; see figure 1 input high voltage 2.0 volts applies to d input low voltage 0.8 volts applies to d input current 10 m a applies to d driver short-circuit current v out = high 35 250 ma -7v v o +12v v out = low 35 250 ma -7v v o +12v SP490 driver ac characteristics maximum data rate 5 mbps driver input to output 20 30 60 ns t plh ; r diff = 54 w , c l1 = c l2 = 100pf; see figures 3 and 6 driver input to output 20 30 60 ns t phl ; r diff = 54 w , c l1 = c l2 = 100pf; see figures 3 and 6 driver skew 5 ns see figures 3 and 6, t skew = | t dplh - t dphl | driver rise or fall time 3 15 40 ns from 10% to 90%; r diff = 54 w , c l1 = c l2 = 100pf; see figures 3 and 6 SP490 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 w -7v v cm 12v input current (a, b); v in = 12v 1.0 ma v in = 12v input current (a, b); v in = -7v -0.8 ma v in = -7v short-circuit current 85 ma 0v v o v cc
3 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation specifications (continued) t min to t max and v cc = 5v 5% unless otherwise noted. parameters min. typ. max. units conditions SP490 receiver ac characteristics maximum data rate 5 mbps receiver input to output 60 90 150 ns t plh ; r diff = 54 w , c l1 = c l2 = 100pf; figures 3 & 8 receiver input to output 60 90 150 ns t phl ; r diff = 54 w , c l1 = c l2 = 100pf; figures 3 & 8 diff. receiver skew it plh -t phl i13 nsr diff = 54 w ; c l1 = c l2 = 100pf; figures 3 & 8 power requirements supply voltage +4.75 +5.25 volts supply current 900 m a environmental and c l1 15pf ro a b a b di de 3v c l2 r diff 500 c l output under test s 1 s 2 v cc figure 3. driver/receiver timing test circuit figure 4. driver timing test load #2 circuit a b r r v od v oc 1k 1k c rl receiver output s 1 s 2 test point v cc figure 1. driver dc test load circuit figure 2. receiver timing test load circuit mechanical operating temperature commercial (_c_) 0 +70 c industrial (_e_) -40 +85 c storage temperature -65 +150 c package plastic dip (_s_) nsoic (_n)
4 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation figure 6. driver propagation delays +3v 0v de 5v v ol a, b 0v 1.5v 1.5v t zl t zh f = 1mhz; t r < 10ns; t f < 10ns v oh a, b 2.3v 2.3v t lz t hz 0.5v 0.5v output normally low output normally high figure 7. driver enable and disable times figure 8. receiver propagation delays +3v 0v di b a driver output v o + differential output v a ?v b 0v v o 1.5v 1.5v t plh t r t f f = 1mhz; t r < 10ns; t f < 10ns v o 1/2v o 1/2v o t phl t dplh t dphl t skew = | t dplh - t dphl | v oh v ol r 1.5v 1.5v t phl f = 1mhz; t r < 10ns; t f < 10ns output v 0d2 + v 0d2 a ?b 0v 0v t plh input t skew = | t phl - t plh |
5 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation 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 specifications 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 specifications t min to t max and v cc = 5v 5% unless otherwise noted. parameters min. typ. max. units conditions sp491 driver dc characteristics differential output voltage gnd v cc volts unloaded; r = ; see figure 1 differential output voltage 2 v cc volts with load; r = 50 w ; (rs422); see figure 1 differential output voltage 1.5 v cc volts with load; r = 27 w ; (rs485); see figure 1 change in magnitude of driver differential output voltage for complimentary states 0.2 volts r = 27 w or r = 50 w ; see figure 1 driver common-mode output voltage 3 volts r = 27 w or r = 50 w ; see figure 1 input high voltage 2.0 volts applies to d, reb, de input low voltage 0.8 volts applies to d, reb, de input current 10 m a applies to d, reb, de driver short-circuit current v out = high 35 250 ma -7v v o 12v v out = low 35 250 ma -7v v o 12v sp491 driver ac characteristics maximum data rate 5 mbps reb = 5v, de = 5v driver input to output 20 30 60 ns t plh ; r diff = 54 w , c l1 = c l2 = 100pf; see figures 3 and 6 driver input to output 20 30 60 ns t phl ; r diff = 54 w , c l1 = c l2 = 100pf; see figures 3 and 6 driver skew 5 10 ns see figures 3 and 6, t skew = | t dplh - t dphl | driver rise or fall time 3 15 40 ns from 10% to 90%; r diff = 54 w , c l1 = c l2 = 100pf; see figures 3 and 6 driver enable to output high 40 70 ns c l1 = c l2 = 100pf; see figures 4 and 7; s 2 closed driver enable to output low 40 70 ns c l1 = c l2 = 100pf; see figures 4 and 7; s 1 closed driver disable time from low 40 70 ns c l1 = c l2 = 15pf; see figures 4 and 7; s 1 closed driver disable time from high 40 70 ns c l1 = c l2 = 15pf; see figures 4 and 7; s 2 closed
6 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation specifications (continued) t min to t max and v cc = 5v 5% unless otherwise noted. parameters min. typ. max. units conditions sp491 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 m a 0.4v v o 2.4v; reb = 5v input resistance 12 15 k w -7v v cm 12v input current (a, b); v in = 12v 1.0 ma de = 0v, v cc = 0v or 5.25v, v in = 12v input current (a, b); v in = -7v -0.8 ma de = 0v, v cc = 0v or 5.25v, v in = -7v short-circuit current 7 85 ma 0v v o v cc sp491 receiver dc characteristics maximum data rate 5 mbps reb = 0v receiver input to output 60 90 150 ns t plh ; r diff = 54 w , c l1 = c l2 = 100pf; figures 3 & 8 receiver input to output 60 90 150 ns t phl ; r diff = 54 w , c l1 = c l2 = 100pf; figures 3 & 8 diff. receiver skew it plh -t phl i13 nsr diff = 54 w ; c l1 = c l2 = 100pf; figures 3 & 8 receiver enable to output low 20 50 ns c rl = 15pf; figures 2 and 9; s 1 closed receiver enable to output high 20 50 ns c rl = 15pf; figures 2 and 9; s 2 closed receiver disable from low 20 50 ns c rl = 15pf; figures 2 and 9; s 1 closed receiver disable from high 20 50 ns c rl = 15pf; figures 2 and 9; s 2 closed power requirements supply voltage +4.75 +5.25 volts supply current 600 m a reb, d = 0v or v cc ; de = v cc sp491 environmental +3v 0v re 5v r 0v 1.5v 1.5v t zl t zh f = 1mhz; t r < 10ns; t f < 10ns r 1.5v 1.5v t lz t hz 0.5v 0.5v output normally low output normally high v il v ih figure 9. receiver enable and disable times and mechanical operating temperature commercial (_c_) 0 +70 c industrial (_e_) -40 +85 c storage temperature -65 +150 c package plastic dip (_s_) nsoic (_n)
7 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation description the SP490 and sp491 are full-duplex differential transceivers that meet the requirements of rs-485 and rs-422. fabricated with a sipex proprietary bicmos process, both products require a fraction of the power of older bipolar 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 +12v) common 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 SP490 and sp491 have differential outputs. the typical voltage output swing with no load will be 0 volts to +5 volts. with worst case loading of 54 w across the differential outputs, the driver can maintain greater than 1.5v voltage levels. the driver of the sp491 has a driver enable control line which is active high. a logic high on de (pin 4) of the sp491 will enable the differential driver outputs. a logic low on de (pin 4) of the sp491 will tri-state the driver outputs. the SP490 does not have a driver enable. receiver... the receivers for both the SP490 and sp491 have differential inputs with an input sensitivity as low as 200mv. input impedance of the receivers is typically 15k w (12k w minimum). a wide common mode range of -7v to +12v allows for large ground potential differences between systems. the receivers for both the SP490 and sp491 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 sp491 has a receiver enable control line which is active low. a logic low on reb (pin 3) of the sp491 will enable the differential receiver. a logic high on reb (pin 3) of the sp491 will tri-state the receiver.
8 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation d eh package: plastic small outline (soic) (narrow) dimensions (inches) minimum/maximum (mm) 8?in a a1 l b e h x 45 a a1 b d e e h h l 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249 0.014/0.019 (0.35/0.49) 0.189/0.197 (4.80/5.00) 0.150/0.157 (3.802/3.988) 0.050 bsc (1.270 bsc) 0.228/0.244 (5.801/6.198) 0.010/0.020 (0.254/0.498) 0.016/0.050 (0.406/1.270) 0?8 (0?8? 14?in 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249) 0.013/0.020 (0.330/0.508) 0.337/0.344 (8.552/8.748) 0.150/0.157 (3.802/3.988) 0.050 bsc (1.270 bsc) 0.228/0.244 (5.801/6.198) 0.010/0.020 (0.254/0.498) 0.016/0.050 (0.406/1.270) 0?8 (0?8?
9 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation d alternate end pins (both ends) d1 = 0.005" min. (0.127 min.) e package: plastic dual?n?ine (narrow) dimensions (inches) minimum/maximum (mm) a = 0.210" max. (5.334 max). e1 c l a2 a1 = 0.015" min. (0.381min.) b b1 e = 0.100 bsc (2.540 bsc) e a = 0.300 bsc (7.620 bsc) a2 b b1 c d e e1 l 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 0.735/0.775 (18.669/19.685) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0? 15 (0?15? 0.115/0.195 (2.921/4.953) 0.014/0.022 (0.356/0.559) 0.045/0.070 (1.143/1.778) 0.008/0.014 (0.203/0.356) 0.355/0.400 (9.017/10.160) 0.300/0.325 (7.620/8.255) 0.240/0.280 (6.096/7.112) 0.115/0.150 (2.921/3.810) 0? 15 (0?15? 8?in 14?in
10 SP490/491ds/09 SP490/491 full duplex rs-485 transceivers ? copyright 2000 sipex corporation ordering information model temperature range package SP490cn. ..................................................................................... 0?c to +70?c ...................... ......................................................... 8-pin nsoic SP490cs ...................................................................................... 0?c to +70?c ...................... ........................................................... 8-pin dip SP490en ..................................................................................... -40?c to +85?c ..................... ........................................................ 8-pin nsoic SP490es ..................................................................................... -40?c to +85?c ..................... .......................................................... 8-pin dip sp491cn ...................................................................................... 0?c to +70?c ...................... ........................................................ 14-pin nsoic sp491cs ...................................................................................... 0?c to +70?c ...................... .......................................................... 14-pin dip sp491en ..................................................................................... -40?c to +85?c ..................... ....................................................... 14-pin nsoic sp491es ..................................................................................... -40?c to +85?c ..................... ......................................................... 14-pin dip please consult the factory for pricing and availability on a tape-on-reel option.
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