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1 sp490eds/14 sp490e enhanced full duplex rs-485 transceivers ? copyright 2000 sipex corporation sp490e/sp491e enhanced full duplex rs-485 transceivers n +5v only n low power bicmos n driver/receiver enable ( sp491e ) n rs-485 and rs-422 drivers/receivers n pin compatible with ltc490 and sn75179 ( sp490e ) n pin compatible with ltc491 and sn75180 ( sp491e ) n improved esd specifications: 15kv human body model 15kv iec1000-4-2 air discharge 8kv iec1000-4-2 contact discharge description the sp490e is a low power differential line driver/receiver meeting rs-485 and rs-422 standards up to 10mbps. 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 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 sp490e sp491e ? now available in lead free
sp490eds/14 sp490e enhanced full duplex rs-485 transceivers ? copyright 2000 sipex corporation 2 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 sp490e 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 ; (rs-422); see figure 1 differential output voltage 1.5 v cc volts w ith load; r = 27 w ; (rs-485); 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 250 ma -7v v o +12v v out = low 250 ma -7v v o +12v sp490e driver ac characteristics maximum data rate 10 mbps r diff = 54 w , c l1 = c l2 = 100pf 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 5 driver skew 5 ns see figures 3 and 5, 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 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 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 sp490eds/14 sp490e enhanced 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 sp490e receiver ac characteristics maximum data rate 10 mbps receiver input to output 20 45 100 ns t plh ; r diff = 54 w , c l1 = c l2 = 100pf; figures 3 & 7 receiver input to output 20 45 100 ns t phl ; r diff = 54 w , c l1 = c l2 = 100pf; figures 3 & 7 diff. receiver skew it plh -t phl i13 nsr diff = 54 w ; c l1 = c l2 = 100pf; figures 3 & 7 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 (_p) nsoic (_n)
sp490eds/14 sp490e enhanced full duplex rs-485 transceivers ? copyright 2000 sipex corporation 4 figure 5. 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 6. driver enable and disable times figure 7. receiver propagation delays y, z y, z +3v 0v di z y driver output v o + differential output v y ?v z 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 y ?z 0v 0v t plh input t skew = | t phl - t plh |
5 sp490eds/14 sp490e enhanced 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 sp491e 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 ; (rs-422); see figure 1 differential output voltage 1.5 v cc volts with load; r = 27 w ; (rs-485); 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 250 ma -7v v o 10v v out = low 250 ma -7v v o 10v sp491e driver ac characteristics maximum data rate 10 mbps r diff = 54 w , c l1 = c l2 = 100pf driver input to output 20 30 60 ns t plh ; r diff = 54 w , c l1 = c l2 = 100pf; see figures 3 and 5 driver input to output 20 30 60 ns t phl ; r diff = 54 w , c l1 = c l2 = 100pf; see figures 3 and 5 driver skew 5 10 ns see figures 3 and 5, 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 5 driver enable to output high 40 70 ns c l1 = c l2 = 100pf; see figures 4 and 6; s 2 closed driver enable to output low 40 70 ns c l1 = c l2 = 100pf; see figures 4 and 6; s 1 closed driver disable time from low 40 70 ns c l1 = c l2 = 15pf; see figures 4 and 6; s 1 closed driver disable time from high 40 70 ns c l1 = c l2 = 15pf; see figures 4 and 6; s 2 closed
sp490eds/14 sp490e enhanced full duplex rs-485 transceivers ? copyright 2000 sipex corporation 6 specifications (continued) 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 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 85 ma 0v v o v cc sp491e receiver ac characteristics maximum data rate 10 mbps reb = 0v, de = 5v receiver input to output 20 45 100 ns t plh ; r diff = 54 w , c l1 = c l2 = 100pf; figures 3 & 7 receiver input to output 20 45 100 ns t phl ; r diff = 54 w , c l1 = c l2 = 100pf; figures 3 & 7 diff. receiver skew it plh -t phl i13 nsr diff = 54 w ; c l1 = c l2 = 100pf; figures 3 & 7 receiver enable to output low 45 70 ns c rl = 15pf; figures 2 and 8; s 1 closed receiver enable to output high 45 70 ns c rl = 15pf; figures 2 and 8; s 2 closed receiver disable from low 45 70 ns c rl = 15pf; figures 2 and 8; s 1 closed receiver disable from high 45 70 ns c rl = 15pf; figures 2 and 8; s 2 closed power requirements supply voltage +4.75 +5.25 volts supply current 900 m a reb, d = 0v or v cc ; de = v cc sp491e 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 8. 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 (_p) nsoic (_n)
7 sp490eds/14 sp490e enhanced full duplex rs-485 transceivers ? copyright 2000 sipex corporation features the sp490e and sp491e are full-duplex dif- ferential 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. theory of operation 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. drivers 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 w across the differential outputs, the driver can maintain greater than 1.5v 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 differ- ential 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. receivers 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 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 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 receiver. esd tolerance the sp490e/sp491e devices incorporate 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 15kv without damage nor latch-up. r r c c c c s s r r s s sw1 sw1 sw2 sw2 r c device under test dc power source c s r s sw1 sw2 figure 9. esd test circuit for human body model
sp490eds/14 sp490e enhanced full duplex rs-485 transceivers ? copyright 2000 sipex corporation 8 there are different methods of esd testing applied: a) mil-std-883, method 3015.7 b) iec1000-4-2 air-discharge c) iec1000-4-2 direct contact the human body model has been the generally accepted esd testing method for semiconductors. this method is also specified 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 manufacturing areas where the ics tend to be handled frequently. the iec-1000-4-2, formerly iec801-2, 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 presence. the premise with iec1000-4-2 is that the system is required to withstand an amount of static electricity when esd is applied to points and surfaces of the r r s s and and r r v v add up to 330 add up to 330 w w f f or iec1000-4-2. or iec1000-4-2. r s and r v add up to 330 w for iec1000-4-2. contact-discharge module contact-discharge module r r v v r r c c c c s s r r s s sw1 sw1 sw2 sw2 r c device under test dc power source c s r s sw1 sw2 r v contact-discharge module figure 10. esd test circuit for iec1000-4-2 figure 11. esd test waveform for iec1000-4-2 t=0ns t=30ns 0a 15a 30a t ? i ? 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 iec1000-4-2 is shown on figure 10 . there are two methods within iec1000-4-2, 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
9 sp490eds/14 sp490e enhanced full duplex rs-485 transceivers ? copyright 2000 sipex corporation person ready to connect a cable onto the rear of the system only to find 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 situations 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 finally to the ic. the circuit models in figures 9 and 10 represent the typical esd testing circuits used for all three methods. the c s is initially charged with the dc power supply when the first switch (sw1) is on. now that the capacitor is charged, the second switch (sw2) is on while sw1 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. for the human body model, the current limiting resistor (r s ) and the source capacitor (c s ) are 1.5k w an 100pf, respectively. for iec-1000-4- 2, the current limiting resistor (r s ) and the source capacitor (c s ) are 330 w an 150pf, respectively. the higher c s value and lower r s value in the iec1000-4-2 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. sp490e/sp491e human body iec1000-4-2 family model air discharge direct contact level driver outputs 15kv 15kv 8kv 4 receiver inputs 15kv 15kv 8kv 4 table 1. transceiver esd tolerance levels
sp490eds/14 sp490e enhanced full duplex rs-485 transceivers ? copyright 2000 sipex corporation 10 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? 22?in 8?in 14?in 16?in 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) 1.145/1.155 (29.083/29.337) 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) 0.780/0.800 (19.812/20.320) 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? 18?in 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) 0.880/0.920 (22.352/23.368) 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? 20?in 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) 0.980/1.060 (24.892/26.924) 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?
11 sp490eds/14 sp490e enhanced 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? 16?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) 0.386/0.394 (9.802/10.000) 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?
sp490eds/14 sp490e enhanced full duplex rs-485 transceivers ? copyright 2000 sipex corporation 12 ordering information model temperature range package sp490ecn. ...................................................... 0?c to +70?c .................................................... . 8-pin nsoic SP490ECP ........................................................ 0?c to +70?c ................................................... ........ 8-pin dip sp490een. ..................................................... -40?c to +85?c ................................................... 8-pin nsoic sp490eep ...................................................... -40?c to +85?c ................................................... ...... 8-pin dip sp491ecn ....................................................... 0?c to +70?c ................................................... 1 4-pin nsoic sp491ecp ........................................................ 0?c to +70?c ................................................... ...... 14-pin dip sp491een. ..................................................... -40?c to +85?c ................................................. 14 -pin nsoic sp491eep ...................................................... -40?c to +85?c ................................................... .... 14-pin dip now available in lead free. to order add "-l' to the part number. example: sp488a = normal, sp488a-l = lead free

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