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________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 1 / 1 7 um3488/ u m 349 1 +3.3v low power um3488eesa sop8 UM3488EEPA dip8 um3491eese sop14 um3491eepe dip14 general description the um3488 / um3491 is 15 kv electrostati c discharge (esd) - protected, high - speed transceivers for rs - 4 22 communication that contain one drive r and one receiver. the um 3 491 contains an additional receiver and driver enable control. the device feature s fail - safe circuitry, whic h guarantees a logic - high receiver outpu t when the receiver input s are ope n or sho rted. this means that the receiver outpu t will be a logic hig h if all transmitters on a terminated bus are disabled (high impedance). the um3488/ um3491 allow s transmit speeds up to 10 m bps. the device feature s enhance d esd protection . all transmitter output s and receiver inputs are protected to 15kv usin g the human bod y model. these transceivers typically draw 180 a 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 a llows up to 256 transceivers on the bus. the um3488/ um 3491 is intended for full - duplex communications. applications fea tures ? rs - 422 communications ? level translators ? transceivers for emi - sensitive applications ? industrial - control local area networks ? es d protection for rs - 4 22 i/o pins 15kv, human body model ? true fail - safe receiver w hile maintaining eia/tia - 422 compatibility ? maximum data rate up to 10mbps ? error - free data transmission ? 1na low - current shutdown mode (um3491) ? allow u p to 256 transceivers o n 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 on bus pin count um3488 full 10 yes no no 180 256 8 um 3491 full 10 yes yes yes 180 256 14 o rdering information part number temperature range packaging type s hipping qty um3488eesa - 40 c to +85 c sop8 2500pcs/13 inch tape & reel UM3488EEPA - 40 c to +85 c dip8 50pcs/tube um3491eese - 40 c to +85 c sop14 2500pcs/13 inch tape & reel um 3491eepe - 40 c to +85 c dip14 25pcs/ tube
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 2 / 1 7 um3488/ u m 349 1 pin configurations top view xx: week code um3488eesa sop8 xx: week code UM3488EEPA dip8 xx: week code um3491eese sop14 xx: week code um3491eepe dip14 absolute maximum ratings symbol parameter value unit 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 - 6 5 to +150 c t l lead temperature for soldering 10 seconds +300 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 3 4 8 8 e e s a x x u m 3 4 8 8 e e p a x x 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
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 3 / 1 7 um3488/ u m 349 1 dc electrical characteristics (v cc = + 3.3 v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = + 3.3 v and t a = +25c.) (note 1) parameter symbol test conditions min typ max unit driver differential driver output (no load) v od1 figure 3 v cc v differential driver output v od2 figure 3 , r = 50 1.8 v cc v differential driver output v od3 figure 3, r = 27 1.3 v cc v change - in - magnitude of differential output v oltage (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 input 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 mv driver short - circuit output current (note 3) v od1 - 7vv out v cc - 250 ma 0vv out 12v 250 receiver input current (a and b) i in de = gnd, v cc = gnd or 3.465v v in = 12v 125 a v in = - 7v - 75 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 - 0.4 v rece iver output low voltage v ol i o = 4ma, 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 - 7vv cm 12v 96 k receiver output short circuit current i osr 0vv ro v cc 7 95 ma supply c urrent supply current i cc no load, de =di=gnd or v cc re ______ =v cc 20 60 a re ______ =gnd 180 300
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 4 / 1 7 um3488/ u m 349 1 supply current in shutd own mode i shdn de = gnd, v re ______ = v cc 0.001 10 a esd protection for y, z, a, b human body model 15 kv note 1: all currents into the device are positive; all currents out of the dev ice 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 fo ldback - current limiting; minimum current level applies during current limiting.
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 5 / 1 7 um3488/ u m 349 1 switching characteristics (v cc = + 3.3 v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = + 3.3 v and t a = +25c .) parameter symbol test conditions m in 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 10 2 5 ns driver rise or fall time t dr , t df figures 5 and 7 , r diff = 54, c l1 = c l2 = 100pf 5 15 30 ns max imum data rate f max 10 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 10 0 1 8 0 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 4 0 1 0 0 ns receiver enable to output high t rzh figures 4 and 1 0 , c l = 100pf, s2 closed 4 0 1 0 0 ns receiver disable time from low t rlz figures 4 and 1 0 , c l = 100pf, s1 closed 4 0 1 0 0 ns receiver disable time from high t rhz figures 4 and 1 0 , c l = 100pf, s2 cl osed 4 0 1 0 0 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 2 00 ns driver enable from shutdown to output low t dzl(shdn) figures 6 and 8 , c l = 15pf, s1 cl osed 40 2 00 ns receiver enable from shutdown - to - output high t rzh(shdn) figures 4 and 1 0 , c l = 100pf, s2 closed 15 0 5 00 ns receiver enable from shutdown - to - output low t rzl(shdn) figures 4 and 1 0 , c l = 100pf, s1 closed 15 0 5 00 ns note 4 : the device i s put 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 this state for at least 600ns, the device is guaranteed to have entered shutdown.
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 6 / 1 7 um3488/ u m 349 1 typical operating characteristics (v cc = +3.3v, t a = +25c, unless otherwise noted.) i ro =8ma re=l,de=h no load supply current vs. temperature 100 125 150 175 200 225 250 -60 -40 -20 0 20 40 60 80 100 temperature( no load supply current(a) re=l,de=h output current vs.receiver output high voltage 0 5 10 15 20 25 30 0 1 2 3 4 output high voltage (v) output current (a) output current vs. receiver output low voltage 0 10 20 30 40 50 60 0 1 2 3 4 output low voltage (v) output current (a) receiver output high voltage vs. temperature 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3 -60 -40 -20 0 20 40 60 80 100 temperature( receiver output high voltage(v)
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 7 / 1 7 um3488/ u m 349 1 typical operating characteristics (continued) (v cc = + 3.3 v, 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 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 -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 0.5 1 1.5 2 2.5 3 3.5 differential output voltage (v) output current (ma)
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 8 / 1 7 um3488/ u m 349 1 pin description pin number symbol function um3488 um3491 - 1 nc not connected 2 2 ro receiver output. when re ______ is low and if a - b - 50mv, ro will be high; if a - b - 200mv, ro will be low. - 3 re ______ 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. - 4 de 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 low - power shutdown mode. 3 5 di 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. 4 6 gnd ground 4 7 gnd ground - 8 nc not connected 5 9 y non - inverting driver output 6 10 z inverting driver output 7 11 b inverting receiver input 8 12 a non - inverting receiver input - 13 nc not connected 1 14 vcc positive supply 3.135 v v cc 3.465 v 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 4 feb .20 1 5 9 / 1 7 um3488/ u m 349 1 typical operating circuit figure 1: um 3491 pin configuration and typical full - dupl ex operating 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 4 feb .20 1 5 10 / 1 7 um3488/ u m 349 1 detailed description the um3488/ um 3491 high - speed transceivers for rs - 422 communication contain on e driver and one receiver. the device feature s fail - safe circuitry, 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 um3488/ um 3491 offer higher driver out put slew - rate limits, a llowing transmit speeds up to 10 m bps. t h e um3488/ um 3491 is f ull - duplex transceiver . it operate s from a single + 3.3 v supply. drivers are output short - circuit current limited. thermal shutdown circuitry protects drivers against excessive power dissipation. w hen activated, the thermal shutdown circuitry places the driver outputs into a high - impedance state. receiver input filtering the receivers o f the um3488/ um 3491 incorporate input filtering in addition to input hysteresis. this filtering enhances noise i mmunity with differential signals that have very slow rise and fall times. receiver propagation delay increases by 20% due to this filtering. fail - safe the um3488/ um 3491 guarantees a logic - high receiver output when the receiver inputs are shorted or open , or when they are 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 log i 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 um3488/ um 349 1 , 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 ar e incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. the driver outputs and receiver inputs of the um3488/ um 3491 have extra protection against static electricity. union s engineers have developed state - of - the - art structures 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 test ed to 15kv using the human body model.
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 11 / 1 7 um3488/ u m 349 1 test circuit figure 3 . driver 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 figu re 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 3 . 3 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 3 . 3 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 3 . 3 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 4 feb .20 1 5 12 / 1 7 um3488/ u m 349 1 applicat ions information 256 transceivers on the bus the standard rs - 4 22 receiver input impedance is 12 k (one - unit load), and the standard driver can drive up to 3 2 unit loads. the um 3491 ha s a 1/8 - unit - load receiver input impedance (96k ), allowing up to 256 tr ansceivers to be connected 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 um3488 / um 3491 is slew - r ate limited, minimizing emi and reducing reflections caused by improperly ter minated 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 rela tes directly to the length of an unterminated stub, which can be driven with only minor waveform reflections. the following equation expresses this relationship conservatively: length = t rise / (1 0 1.5ns/ft) where t rise is the transmitters rise time. l ow - power shutdown mode (um3491) 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 are 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 power dissipation caused by faults or by bus contention. the first, a foldback current limit on the output stage, provides immediate protection against short cir cuits over the whole common - mode voltage range. the second, a ther - mal shu tdown circuit, forces the 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 app lication shown in figure 1 2 .
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 13 / 1 7 um3488/ u m 349 1 package information um3488eesa 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 dimension: 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 3 4 8 8 e e s a x x
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 14 / 1 7 um3488/ u m 349 1 UM3488EEPA dip8 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 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 3 4 8 8 e e p a x x
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 15 / 1 7 um3488/ u m 349 1 um 3 491eese sop14 outli ne 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 0.341 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 3 4 9 1 e e s e x x
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 16 / 1 7 um3488/ u m 349 1 um3 49 1eep e di p14 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 3 4 9 1 e e p e x x
________________________________________________________________________ http://www.union - ic.com rev.0 4 feb .20 1 5 17 / 1 7 um3488/ u m 349 1 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 r oa d, shanghai 2012 10 tel: 021 - 51093966 fax: 021 - 51026018 website: www.union - ic.com

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