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________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 1 / 17 um488/ u m 491 15kv esd - protected, fail - safe, slew - rate - limited rs - 422 transceivers in sop8/ dip8/ sop14/dip14 general description the um488 / um 491 is 15 kv electrostatic discharge (esd) - protected, high - speed transceivers for rs - 422 communication that contain one driver and one receiver. the um491 contains an additional receiver and driver enable control. the device feature s fail - safe circuitry, which guarantees a logic - high receiver output when the receiver inputs are open or shorted. this means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). the um488 /um491 offer s higher driver output slew - rate limits, allowing transmit speeds up to 2.5m bps. the device feature s enhanced esd protection. all transmitter outputs and receiver inputs are protected to 15kv using the human body model. these transceivers typically draw 375a of supply current when unloaded, or when fully loaded with the drivers disabled. the device h as a 1/8 - unit - load receiver input impedance that allows up to 256 transceivers on the bus. the um488 / um 491 is intended for full - duplex communications. applications features ? rs - 422 communications ? level translators ? transceivers for emi - sensitive applications ? industrial - control local area networ ks ? esd protection for rs - 4 22 i/o pins 15kv, human body model ? true fail - safe receiver w hile maintaining eia/tia - 422 compatibility ? enhanced slew - rate limiting facilitates error - free data transmission ? 1na low - current shutdown mode (um491) ? allow u p to 256 transceivers on the bus selector guide part number half/full duplex data rate (mbps) slew - rate limited low - power shutdown receiver/ driver enable quiescent current ( a) transceivers o n bus pin count um488 full 2.5 yes no no 375 256 8 um491 full 2.5 yes yes yes 375 256 14 o rdering information part number temperature range packaging type s hipping qty um488eesa - 40 c to +85 c sop8 2500pcs/13 inch tape & reel UM488EEPA - 40 c to +85 c dip8 50pcs/tube um491eese - 40 c to +85 c sop14 2500pcs/13 inch ta pe & reel um491eepe - 40 c to +85 c dip14 25 pcs /tube
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 2 / 17 um488/ u m 491 pin configurations top view xx: week code um491eese sop14 xx: week code um491eepe dip14 xx: week code um488eesa sop8 xx: week code UM488EEPA dip8 absolute maximum ratings s ymbol p arameter v alue u nit v cc supply voltage +7 v control input voltage ( re __ ____ , de) - 0.3v to (vcc + 0.3v) v driver input voltage (di) - 0.3v to (vcc + 0.3v) v driver output voltage (a, b, y, z) 13 v receiver input voltage (a, b) 25 v receiver output voltage (ro) - 0.3v to (vcc + 0.3v) v p d 8 - pin so (derate 9.09 mw /c above +70c) 520 mw 8 - pin plastic dip (derate 9.09 mw/c above +70c) 727 14 - pin plastic dip (derate 10.0mw/c above +70c) 800 14 - pin so (derate 8.33mw/c above +70c) 667 t a ambient temperature - 40 to +85 c t stg storage temperature range - 65 to +150 c t l lead temperature for soldering 10 seconds +300 c 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 r d n c r o r e d e d i g n d g n d v c c n c a b z y n c 1 2 3 4 r d 8 7 6 5 v c c r o d i g n d y z b a u m 4 8 8 e e s a x x u m 4 8 8 e e p a x x
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 3 / 17 um488/ u m 491 dc electrical characteristics (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) parameter symbol test conditions mi n typ max unit driver differential driver output (no load) v od1 figure 3 5 v differential driver output v od2 figure 3 , r = 50 2.0 v change - in - magnitude of differential output voltage (note 2) v od figure 3 , r = 50 0.2 v driver common - mode output voltage v oc figure 3 , r = 50 3.0 v change - in - magnitude of common - mode voltage (note 2) v oc figure 3 , r = 50 0.2 v in put high voltage v ih de, di, re ______ 2.0 v input low voltage v il de, di, re ______ 0.8 v di input hysteresis v hys 100 m v input current (a and b) i in de = gnd, v cc = gnd or 5.25v v in = 12v 125 a v in = - 7v - 75 output leakage (y and z) i o de = gnd, v cc = gnd or 5.25v v in = 12v 125 a v in = - 7v - 100 driver short - circuit output current (note 3) v od1 - 7v v out v cc - 250 ma 0vv out 12v 250 0vv out v cc 25
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 4 / 17 um488/ u m 491 dc electrical characteristics ( continued ) (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) parameter symbol test condi tions min typ max unit receiver receiver differential threshold voltage v th - 7vv cm 12v - 200 - 125 - 50 mv receiver input hysteresis v th 25 mv receiver output high voltage v oh i o = - 4ma, v id = - 50mv v cc - 1.5 v receiver output low voltage v ol i o = 4 ma, v id = - 200mv 0.4 v three - state output current at receiver i ozr 0.4v v o 2.4v 1 a receiver input resistance r in - 7v v cm 12v 96 k receiver output short circuit current i osr 0v v ro v cc 7 95 ma supply current supply current i cc no load , re _______ = di = gnd or v cc de = v cc 430 900 a de = gnd 375 600 supply current in shutdown mode i shdn de = gnd, v re = v cc 0.001 10 a esd protection for y, z, a, b human body mod el 15 kv note 1: all currents into the device are positive; all currents out of the device are negative. all voltages are referred to device ground unless otherwise noted. note 2: v od and v oc are the changes in v od and v oc , respectively, when the di input changes state. note 3 : maximum current level applies to peak current just prior to foldback - current limiting; minimum current level applies during current limiting.
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 5 / 17 um488/ u m 491 switching characteristics (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) parameter symbol test conditions min typ max unit driver input - to - output t dplh figures 5 and 7 , r diff = 54 , c l1 = c l2 = 100pf 10 30 60 ns t dphl 10 30 60 driver output skew | t dplh - t dph l | t dskew figures 5 and 7 , r diff = 54, c l1 = c l2 = 100pf 5 10 ns driver rise or fall time t dr , t df figures 5 and 7 , r diff = 54, c l1 = c l2 = 100pf 5 15 25 ns maximum data rate f max 2. 5 m bps driver enable to output high t dzh figures 6 and 8 , c l = 100pf, s2 closed 40 70 ns driver enable to output low t dzl figures 6 and 8 , c l = 100pf, s1 closed 40 70 ns driver disable time from low t dlz figures 6 and 8 , c l = 15pf, s1 closed 40 70 ns driver disable time from high t dhz figures 6 and 8 , c l = 15pf, s2 closed 40 70 ns receiver input to output t rplh , t rphl figures 9 and 1 1 ; | v id | 2.0v; rise and fall time of v id 1 5ns 20 90 150 ns | t rplh - t rphl | differential receiver skew t rskd figures 9 and 1 1 ; | v id | 2.0v; rise and fall time of v id 1 5ns 1 3 ns receiver enable to output low t rz l figures 4 and 1 0 , c l = 100pf, s1 closed 20 5 0 ns receiver enable to output high t rzh figures 4 and 1 0 , c l = 100pf, s2 closed 20 50 ns receiver disable time from low t rlz figures 4 and 1 0 , c l = 100pf, s1 closed 20 50 ns receiver disable time from high t rhz figures 4 and 1 0 , c l = 100pf, s2 closed 20 50 ns time to shutdown t shdn (note 4 ) 50 200 600 ns driver enable from shutdown to output high t dzh(shdn) figures 6 and 8 , c l = 15pf, s2 closed 40 100 ns driver enable from shutdown to output low t dzl(shdn) figures 6 and 8 , c l = 15pf, s1 closed 40 100 ns receiver enable from shutdown - to - output high t rzh(shdn) figures 4 and 1 0 , c l = 100pf, s2 closed 300 1000 ns receiver enable from shutdown - to - output low t rzl(shdn) figures 4 and 1 0 , c l = 100pf, s1 closed 300 1000 ns note 4 : the device is p ut into shutdown by bringing re _______ high and de low. if the enable inputs are in this state for less than 50ns, the device is guaranteed not to enter shutdown. if the enable inputs are in t his state for at least 600ns, the device is guaranteed to have entered shutdown.
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 6 / 17 um488/ u m 491 typical operating characteristics (v cc = +5v, t a = +25c, unless otherwise noted.) i ro =8ma output current vs. receiver output high voltage 0 10 20 30 40 50 60 70 0 1 2 3 4 5 6 output high voltage (v) output current (a) output current vs. receiver output low voltage 0 10 20 30 40 50 60 70 0 1 2 3 4 5 6 output low voltage (v) output current (a) receiver output high voltage vs. temperature 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5 -60 -40 -20 0 20 40 60 80 100 temperature( receiver output high voltage(v) no load supply current vs. temperature 200 225 250 275 300 325 350 375 400 -60 -40 -20 0 20 40 60 80 100 temperature( no load supply current(ua) re=l,de=h
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 7 / 17 um488/ u m 491 typical operating characteristics (continued) (v cc = +5v, t a = +25c, unless otherwise noted.) i ro =8ma r t =54ohm receiver output low voltage vs. temperature 0.1 0.15 0.2 0.25 0.3 0.35 0.4 -60 -40 -20 0 20 40 60 80 100 temperature( receiver output low voltage(v) driver differential output voltage vs. temperature 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 -60 -40 -20 0 20 40 60 80 100 temperature( output voltage(v) driver output current vs. differential output voltage 0.1 1 10 100 0 1 2 3 4 5 6 differential output voltage (v) output current (ma)
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 8 / 17 um488/ u m 491 pin description symbol pin number function um488 um491 nc - 1 not connected ro 2 2 receiver output. when re ________ is low and if a - b - 50mv, ro will be high; if a - b - 200mv, ro will be low. re _______ - 3 receiver output enable. drive re ______ low to enable ro; ro is high impedance when re ______ is high. drive re ______ high and de low to enter low - power shutdown mode. de - 4 driver output enable. drive de high to enable driver outputs. these outputs are high impedance when de is low. drive re ______ high and de low to enter lo w - power shutdown mode. di 3 5 driver input. with de high, a low on di forces non - inverting output low and inverting output high. similarly, a high on di forces non - inverting output high and inverting output low. gnd 4 6 ground gnd 4 7 ground nc - 8 not connected y 5 9 non - inverting driver output z 6 10 inverting driver output b 7 11 inverting receiver input a 8 12 non - inverting receiver input nc - 13 not connected vcc 1 14 positive supply 4.75v v cc 5.25v functions tables transmi t ting inputs outputs re ______ de di z y x 1 1 0 1 x 1 0 1 0 0 0 x high - z high - z 1 0 x shutdown receiving inputs output re ______ de a - b ro 0 x - 0.05v 1 0 x - 0.2v 0 0 x open/short 1 1 1 x high - z 1 0 x shutdown
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 9 / 17 um488/ u m 491 typical operating circuit figure 1: um 491 pin configuration and typical full - duplex o perating circuit figure 2 : typical full - duplex rs - 422 network r t r t d i r o n c 1 , 8 , 1 3 2 5 d r r e g n d 3 6 , 7 1 1 1 2 1 0 9 a b z y d e v c c 4 1 4 r d v c c r e g n d d e r o d i r d r d r o r e d e d i a b z y 1 2 0 o h m 1 2 0 o h m d i d e r e r o y z b a r d d i d e r e r o y z b a 1 2 0 o h m 1 2 0 o h m d r a b z y d i d e r e r o
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 10 / 17 um488/ u m 491 detailed description the um488 / um 491 high - speed transceivers for rs - 422 communication contain on e driver and one receiver. the device feature s fail - safe circui try, which guarantees a logic - high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled . the um488 / um491 offer higher driver out put slew - rate limits, allowing t ransmit speeds up to 2.5m bps. t he um488 / um 491 is f ull - duplex transceiver . it operate s from a single +5v supply. drivers are output short - circuit current limited. thermal shutdown circuitry protects drivers against excessive power dissipation. when activate d, the thermal shutdown circuitry places the driver outputs into a high - impedance state. receiver input filtering the receivers of the um488 / um491 incorporate input filtering in addition to input hysteresis. this filtering enhances noise immunity with d ifferential signals that have very slow rise and fall times. receiver propagation delay increases by 20% due to this filtering. fail - safe the um488 / um 491 guarantees a logic - high receiver output when the receiver inputs are shorted or open, or when they a re connected to a terminated transmission line with all drivers disabled. this is done by setting the receiver threshold between - 50mv a nd - 200mv. if the differential receiver input voltage (a - b) is greater than or equal to - 50mv, ro is logi c high. if a - b is less than or equal to - 200mv, ro is logic low. in the case of a termin ated bus with all transmitters disabled, the receivers differential input voltage is pulled to 0v by the termination. with the receiver thresholds of the um488 / um 491 , this results in a logic high with a 50mv minimum noise margin. unlike previous fail - safe devices, the - 50mv to - 200mv threshold comp lies with the 200mv eia/tia - 4 22 standard. 15kv esd protection a s with all union devices, esd - protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. the driver outputs and receiver inputs of the um488 / um 491 have extra protection against static electricity. union s engineers have developed state - of - the - art str uctures to protect these pins against esd of 15kv without damage. the esd - protected pins are tested with reference to the ground pin in a powered - down condition. they are tested to 15kv using the human body model.
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 11 / 17 um488/ u m 491 test circuit figure 3 . d river dc test load figure 4 . receiver enable/disable timing test load figure 5 . driver timing test circuit figure 6 . driver enable and disable timing test load figure 7 . driver propagation delays figure 8 . driver enable and disable times figure 9 . receiver propagation delays figure 1 0 . receiver enable and disable times figure 1 1 . receiver propagation delay test circuit figure 12: line repeater y z r r v od v oc 1 k 1 k vcc s 1 s 2 + c rl 15 pf test point receive output z y di de 3 v v od 2 c l 1 c l 2 r diff + c l s 1 s 2 vcc output under test 500 ohm di 0 v 5 v 1 . 5 v z y v o 1 / 2 v o t dphl 1 / 2 v o 1 . 5 v t dplh v diff 0 v o v o 10 90 10 90 t dr t df v diff = v ( y ) - v ( z ) t skew = t dplh - t dphl 1 . 5 v 1 . 5 v de 0 v 5 v y , z y , z 0 v ol v ol + 0 . 5 v v oh - 0 . 5 v 2 . 3 v 2 . 3 v output normally low output normally high t dzl ( shdn ) , tdzl t dzh ( shdn ) , tdzh tdhz tdlz 1 . 5 v 1 . 5 v input a b 1 v - 1 v v oh v ol ro output t rplh t rphl 1 . 5 v 1 . 5 v re 0 v 5 v ro 0 vcc v ol + 0 . 5 v v oh - 0 . 5 v 1 . 5 v 1 . 5 v output normally low output normally high t rzl ( shdn ) , trzl t rzh ( shdn ) , trzh trhz trlz ate v d r b a receiver output 120 ohm di ro r d y z b a 120 ohm data in data out re de
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 12 / 17 um488/ u m 491 applications information 25 6 transceivers on the bus the standard rs - 4 22 receiver input impedance is 12k (one - unit load), and the standard driver can drive up to 3 2 unit loads. the um491 ha s a 1/8 - unit - load receiver input impedance (96k ), allowing up to 256 transceivers to be conn ected in par allel on one communication line. any combination of t hese devices and/or other rs - 4 22 transceivers with a total of 32 unit loads or less can be connected to the line. reduced emi and reflections the um488 / um 491 is slew - rate limited, minimizing emi and reducing reflections caused by improperly terminated cables. it s high - frequency harmonic components are much lower in amplitude, and the potential for emi is significantly reduced. in general, a transmitters rise time relates directly to the le ngth of an unterminated stub, which can be driven with only minor waveform reflections. the following equation expresses this relationship conservatively: length = t rise / (10 1.5ns/ft) where t rise is the transmitters rise time. low - power shutdown mode (um491) low - power shutdown mode is initiated by bringing both re _____ high and de low. in shutdown, the devices typically draw only 1na of supply current. re _____ and de may be driven simultaneously; the parts are guaranteed not to enter shutdown if re _____ is high and de is low for less than 50ns. if the inputs ar e in this state for at least 600ns, the parts are guaranteed to enter shutdown. enable times t zh and t zl in the switching characteristics tables assume the part was not in a low - power shutdown state. enable times t zh(shdn) and t zl(shdn) assume the parts were shu t down. it takes drivers and receivers longer to become enabled from low - power shutdown mode (t zh(shdn) , t zh(shdn) ) than from driver/receiver - disable mode (t zh , t zl ). driver output protection two mechanisms prevent excessive output current and pow er dissipation caused by faults or by bus contention. the first, a foldback current limit on the output stage, provides immediate protection against short circuits over the whole common - mode voltage range. the second, a ther - mal shutdown circuit, forces t he driver outputs into a high - impedance state if the die temperature becomes excessive. line length vs. data rate the rs - 422 standard covers line lengths up to 4000 feet. for line lengths greater than 4000 feet, use the repeater application shown in figur e 1 2 .
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 13 / 17 um488/ u m 491 package information um488eesa sop8 outline drawing dimensions symbol millimeters inches min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.33 0.51 0.013 0.020 c 0.170 0.250 0.006 0.010 d 4.700 5.100 0.185 0.200 e 3.800 4.000 0.150 0.157 e1 5.800 6.200 0.228 0.244 e 1.270 (bsc) 0.050 (bsc) l 0.400 1.270 0.016 0.050 0 8 0 8 land pattern notes: 1. compound di mension: 4.90 3.90 2. unit: mm; 3. general tolerance 0.0 5 mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation d e 1 e e 1 2 t o p v i e w l c e n d v i e w a 2 b a 1 a s i d e v i e w 4 . 9 5 1 . 3 0 1 . 2 7 0 . 5 0 u m 4 8 8 e e s a x x
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 14 / 17 um488/ u m 491 UM488EEPA dip8 outline drawing dim ensions symbol millimeters inches min max min max a - 5.08 - 0.200 a1 0.38 - 0.015 - a2 3.18 4.45 0.125 0.175 a3 1.40 2.03 0.055 0.080 b 0.41 0.56 0.016 0.022 b1 1.14 1.65 0.045 0.065 c 0.20 0.30 0.008 0.012 d 8.84 9.91 0.348 0.390 d1 0.13 2.03 0.005 0.080 e 7.62 8.26 0.300 0.325 e1 6.10 7.87 0.240 0.310 e 2.54 - 0.100 - ea 7.62 - 0.300 - eb - 10.16 - 0.400 l 2.92 3.81 0.115 0.150 tape and reel orientation d d 1 a 3 a 2 a 1 a l e b b 1 e 1 e e a e b c u m 4 8 8 e e p a x x
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 15 / 17 um488/ u m 491 um491eese sop14 outline drawing dimensions symbol millimeters inches min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.250 1.650 0.050 0.066 a3 0.550 0.750 0.022 0.030 b 0.360 0.490 0.014 0.020 c 0.170 0.250 0.006 0.010 d 8.530 8.730 0.3 41 0.349 e 5.800 6.200 0.228 0.244 e1 3.800 4.000 0.152 0.160 e 1.270bsc 0.050bsc l 0.450 0.800 0.018 0.032 l1 1.04ref 0.042ref l2 0.250bsc 0.010bsc 1 6 10 6 10 2 6 10 6 10 3 5 9 5 9 4 5 9 5 9 land pattern notes: 1. compound dimension: 8.63 3.90 ; 2. unit: mm; 3. general tolerance 0.0 5 mm unless otherwise specified; 4. the layout is ju st for reference. tape and reel orientation d e 1 e e b 0 . 2 5 m c a 2 a 1 a 0 . 1 0 a 3 i n d e x ? 0 . 8 0 . 1 d e p 0 . 2 0 . 1 1 . 2 7 4 . 9 5 0 . 5 0 1 . 3 0 u m 4 9 1 e e s e x x
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 16 / 17 um488/ u m 491 um491eepe dip14 outline drawing dimensions symbol millimeters inches min max min max a - 5.08 - 0.200 a1 0.38 - 0.015 - a2 3.18 4.45 0.125 0.175 a3 1.40 2.03 0.055 0.080 b 0.41 0.56 0.016 0.022 b1 1.14 1.65 0.045 0.065 c 0.20 0.30 0.008 0.012 d 18.67 19.43 0.735 0.765 d1 0.13 2.03 0.005 0.080 e 7.62 8.26 0.300 0.325 e1 6.10 7.87 0.240 0.310 e 2.54 - 0.100 - ea 7.62 - 0.300 - eb - 1 0.16 - 0.400 l 2.92 3.81 0.115 0.150 tape and reel orientation d d 1 a 3 a 2 a 1 a l e b b 1 e 1 e e a e b c u m 4 9 1 e e p e x x
________________________________________________________________________ http://www.union - ic.com rev.0 5 dec .20 1 4 17 / 17 um488/ u m 491 important notice the information in this document has been carefully reviewed and is believed to be accurate. nonetheless, this document is subject to cha nge without notice. union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. union rese rves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. union semiconductor, inc add : unit 606, no.570 shengxia road, shanghai 2012 10 tel: 021 - 5109 3966 fax: 021 - 51026018 website: www.union - ic.com

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