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________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 1/12 um3085e/um3088e 15kv esd-protected, slew-rate-limited, fail-safe, true rs-485 transceivers um3085e/um3088e sop8/dip8 general description the um3085e, um3088e are 15kv esd-protect ed, high-speed transceivers for rs-485 communication that contain one driver and one receiver. these devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open, shorted or idle. this means that the receiver output will be logic high if all transmitters on a terminated bus are disabled (high impedance). the um3085e features reduced slew-rate driver that minimizes emi and reduces reflections caused by improperly te rminated cables, allowing error-free data transmission up to 500kbps. while partially slew-rate limited um3088e speeds up to 2.5mbps. all devices feature enhanced esd protection. all transmitter outputs and receiver inputs are protected to 15kv using the human body model and iec61000-4-2, air-gap discharge. the transceivers typically draw 400 a of supply current when unloaded, or when fully loaded with the drivers disabled. all devices have a 1/8- unit-load receiver input impedance that allows up to 256 transceivers on the bus and are intended for half-duplex communications. applications features z rs-485 transceivers z level translators z industrial-control local area networks z transceivers for emi-sensitive applications z esd protection for rs-485 i/o pins 15kv?human body model 15kv?iec61000-4-2, air-gap discharge z true fail-safe receiv er while maintaining eia/tia-485 compatibility z enhanced slew-rate limiting facilitates error-free data transmission z 2na low-current shutdown mode z ?7v to +12v common-mode input voltage range z allows up to 256 transceivers on the bus z thermal shutdown z current-limiting for driver overload protection ordering information part number operating temperature mark code package type um3085eesa -40c to +85c um3085eesa sop8 UM3085EEPA -40c to +85c UM3085EEPA dip8 um3088eesa -40c to +85c um3088eesa sop8 um3088eepa -40c to +85c um3088eepa dip8 selection guide part number guaranteed date rate (mbps) low-power shutdown slew-rate limited driver/ receiver enable shutdown current (na) transceivers on bus 15kv esd protection um3085e 0.5 yes yes yes 2 256 yes um3088e 2.5 yes yes yes 2 256 yes
________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 2/12 um3085e/um3088e absolute maximum ratings symbol parameter value unit v cc supply voltage +7 v control input voltage (/re, de) -0.3v to (v cc + 0.3v) v driver input voltage (di) -0.3v to (v cc + 0.3v) v driver output voltage (a, b) -7.5 to +12.5 v receiver input voltage (a, b) -7.5 to +12.5 v receiver output voltage (ro) -0.3v to (v cc + 0.3v) v t a ambient temperature -40 to +85 c t stg storage temperature range -65 to +160 c t l lead temperature for soldering 10 seconds +300 c 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 min typ max unit supply current de = v cc , re _______ =0v or v cc 0.3 supply current i cc no load, di = gn d or v cc de = 0v, re _______ =0v 0.25 ma supply current in shutdown mode i shdn de = gnd, r e _______ = v cc 0.002 10 a logic input high voltage v ih1 de, di, r e ______ 2.0 v input low voltage v il1 de, di, r e ______ 0.8 v di input hysteresis v hys um3085e 100 mv driver differential driver output v od1 no load, figure 2 5 v differential driver output v od2 figure 2 , r = 50 ? 1.5 v change-in-magnitude of differential output voltage v od figure 2 , r = 50 ? ; (note 2) 0.2 v driver common-mode output voltage v oc figure 2 , r = 50 ? 3.0 v change-in-magnitude of common-mode voltage v oc figure 2, r = 50 ? ; (note 2) 0.2 v v out = -7v -250 driver short-circuit output current (note 3) i osd v out = 12v 250 ma
________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 3/12 um3085e/um3088e 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 conditions min typ max unit receiver receiver differential threshold voltage v th -7v v cm 12v -200 -50 mv receiver input hysteresis v th v cm =0v 25 mv receiver input resistance r in -7v v cm 12v 96 k ? v in = 12v 1.0 input current (a and b) i in2 de = gnd, v cc = gnd or 5v v in = -7v -0.8 ma receiver output high voltage v oh i o = -1.5ma, v id = 200mv v cc -1.5 v receiver output low voltage v ol i o = 2.5ma, v id = 200mv 0.4 v three-state output current at receiver i ozr v cc = 5v, 0v v o v cc 1 a receiver output short circuit current i osr 0v v ro v cc 8 60 ma esd protection human body model 15 iec61000-4-2 air discharge 15 esd protection for a, b iec61000-4-2 contact 8 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 cu rrent just prior to fold back current limiting; minimum current level applies during current limiting.
________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 4/12 um3085e/um3088e switching characteristics (um3085e) (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 maximum data rate f max 500 kbps t dplh 250 720 1000 driver input-to-output t dphl figures 3 and 7, r diff = 54 ? , c l1 = c l2 = 100pf 250 720 1000 ns driver output skew | t dplh - t dphl | t dskew figures 3 and 7 , r diff = 54 ? , c l1 = c l2 = 100pf 3 100 ns driver rise or fall time t dr , t df figures 3 and 7 , r diff = 54 ? , c l1 = c l2 = 100pf 200 530 750 ns driver enable to output high t dzh figures 4 and 8 , c l = 100pf, s2 closed 2500 ns driver enable to output low t dzl figures 4 and 8 , c l = 100pf, s1 closed 2500 ns driver disable time from low t dlz figures 4 and 8 , c l = 15pf, s1 closed 100 ns driver disable time from high t dhz figures 4 and 8 , c l = 15pf, s2 closed 100 ns receiver input to output t rplh , t rphl | v id | 2.0v; rise and fall time of v id 1 5ns 127 200 ns differential receiver skew | t rplh - t rphl | t rskd figures 6 and 9; | v id | 2.0v; rise and fall time of v id 1 5ns 3 30 ns receiver enable to output low t rzl figures 5 and 10 , c l = 100pf, s1 closed 20 50 ns receiver enable to output high t rzh figures 5 and 10 , c l = 100pf, s2 closed 20 50 ns receiver disable time from low t rlz figures 5 and 10 , c l = 100pf, s1 closed 20 50 ns receiver disable time from high t rhz figures 5 and 10 , 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 4 and 8 , c l = 15pf, s2 closed 4500 ns driver enable from shutdown to output low t dzl(shdn) figures 4 and 8 , c l = 15pf, s1 closed 4500 ns receiver enable from shutdown to output high t rzh(shdn) figures 5 and 10 , c l = 100pf, s2 closed 3500 ns receiver enable from shutdown to output low t rzl(shdn) figures 5 and 10 , c l = 100pf, s1 closed 3500 ns note 4: the device is put into shutdown by bringing r e _______ 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.03jun.2013 5/12 um3085e/um3088e switching characteristics (um3088e) (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 maximum data rate f max 2.5 mbps t dplh 34 60 driver input-to-output t dphl figures 3 and 7, r diff = 54 ? , c l1 = c l2 = 100pf 34 60 ns driver output skew | t dplh - t dphl | t dskew figures 3 and 7 , r diff = 54 ? , c l1 = c l2 = 100pf 2.5 10 ns driver rise or fall time t dr , t df figures 3 and 7 , r diff = 54 ? , c l1 = c l2 = 100pf 14 25 ns driver enable to output high t dzh figures 4 and 8 , c l = 100pf, s2 closed 150 ns driver enable to output low t dzl figures 4 and 8 , c l = 100pf, s1 closed 150 ns driver disable time from low t dlz figures 4 and 8 , c l = 15pf, s1 closed 100 ns driver disable time from high t dhz figures 4 and 8 , c l = 15pf, s2 closed 100 ns receiver input to output t rplh , t rphl | v id | 2.0v; rise and fall time of v id 1 5ns 106 150 ns differential receiver skew | t rplh - t rphl | t rskd figures 6 and 9; | v id | 2.0v; rise and fall time of v id 1 5ns 0 10 ns receiver enable to output low t rzl figures 5 and 10 , c l = 100pf, s1 closed 20 50 ns receiver enable to output high t rzh figures 5 and 10 , c l = 100pf, s2 closed 20 50 ns receiver disable time from low t rlz figures 5 and 10 , c l = 100pf, s1 closed 20 50 ns receiver disable time from high t rhz figures 5 and 10 , 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 4 and 8 , c l = 15pf, s2 closed 250 ns driver enable from shutdown to output low t dzl(shdn) figures 4 and 8 , c l = 15pf, s1 closed 250 ns receiver enable from shutdown to output high t rzh(shdn) figures 5 and 10 , c l = 100pf, s2 closed 3500 ns receiver enable from shutdown to output low t rzl(shdn) figures 5 and 10 , c l = 100pf, s1 closed 3500 ns note 4: the device is put into shutdown by bringing r e _______ 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.03jun.2013 6/12 um3085e/um3088e pin description pin number symbol function 1 ro receiver output. if a b by -50mv, ro will be high; if a b by 200mv, ro will be low. 2 re _______ receiver output enable. drive re ______ low to enable receiver, ro is high impedance when re ______ is high. drive re ______ high and de low to enter low-power shutdown mode. 3 de driver enable. drive de high to enable drivers. the outputs are high impedance when de is low. drive re ______ high and de low to enter low-power shutdown mode. 4 di driver input. a low on di forces output a low and output b high. similarly, a high on di forces output a high and output b low. 5 gnd ground 6 a non-inverting receiver input and non-inverting driver output 7 b inverting receiver input and inverting driver output, 8 v cc power supply for rs-485 transceiver rs-485 communication function table table1. transmitting inputs outputs re ______ de di b a mode x 1 1 0 1 normal x 1 0 1 0 normal 0 0 x high-z high-z normal 1 0 x high-z high-z shutdown x=don?t care; high-z=high impedance table2. receiving inputs outputs re ______ de a, b ro mode 0 x >-50mv 1 normal 0 x <-200mv 0 normal 0 x inputs open 1 normal 1 0 x high-z shutdown x=don?t care; high-z=high impedance
________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 7/12 um3085e/um3088e typical operating circuit figure 1. typical half-duplex rs-485 network test circuit figure 2. driver dc test load figure 3. driver timing test circuit figure 4. driver enable/disable timing test load figure 5. receiver enable/disable timing test load figure 6. receiver propag ation delay test circuit b a r load/2 r load/2 v od v oc 1k 1k v cc s1 s2 + c rl 15pf test point receive output b a di de 3v v od2 c l2 c l1 r diff + c l s1 s2 v cc driver output under test 500ohm r d di de ro re r d di de ro re r d de ro re di b a ba b a r d de di ro re b a 120ohm 120ohm b a master node slave node1 slave node n terminal slave node ate v d r b a receiver output
________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 8/12 um3085e/um3088e figure 7. driver propagation delays figure 8. driver enable and disable times figure 9. receiver propagation delays figure 10. receiver enable and disable times detail description the um3085e, um3088e high-speed transceivers for rs-485 communication contain one driver and one receiver. these devices feature fail-safe circ uitry, 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 um3085e features reduced slew-rate driver that minimizes emi and reduces reflections caused by improperly terminated cables, allowing error-free data transmission up to 500kbps. while partially slew-rate limited um3088e speeds up to 2.5mbps. all of the parts operate from a single +5v supply. drivers are output short-circuit current limited. thermal shutdown circuitry protects drivers agai nst excessive power dissipation. when activated, the thermal shutdown circuitry places the driv er outputs into a high impedance state. fail-safe the um3085e, um3088e 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 and -200mv. if the differential receiver input voltage (a-b) is greater than or equal to -50mv, ro is logic high. if a-b is less than or equal to -200mv, ro is logic low. in the case of a terminated bus with all transmitters disabled, the receiver?s differential input voltage is pulled to 0v by the termination. with the receiver thresholds of the um3085e, um30 88e, this results in a logic high with a 50mv minimum noise margin. unlike previous fail-safe devices, the -50mv to -200mv threshold complies with the 200mv eia/tia-485 standard. 15kv esd protection as with all union devices, esd-protection structures are incorporated on all pins to protect against electrostatic discharges encountered dur ing handling and assembly. the driver outputs and receiver inputs of the um3085e, um3088e 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 ar e tested with reference to the ground pin in a powered-down condition. they are tested to 15kv using the human body model. di 5v b 0v a v o 1.5v 1.5v t dplh t dphl 1/2v o 1/2v o -v o v o 0v v diff 90% 90% 10% 10% t df t dr v diff = v b - v a t skew =|t dplh - t dphl | output normally low output normally high de 5v b 0v a 1.5v 1.5v v ol v oh v ol v oh 2.3v 2.3v t dlz t dzl(shdn) , t dzl t dhz t dzh(shdn) , t dzh v ol +0.5v v oh -0.5v v oh v ol ro 1v -1v b a 1.5v 1.5v output input t rplh t rphl output normally low output normally high re 5v 0v ro 1.5v v oh v ol 1.5v 1.5v t rlz t rzl(shdn) , t rzl t rhz t rzh(shdn) , t rzh v ol +0.5v v oh -0.5v 1.5v
________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 9/12 um3085e/um3088e applications information 256 transceivers on the bus the standard rs-485 receiver input impedance is 12k ? (one unit load), and the standard driver can drive up to 32 unit loads. the union family of transceivers have a 1/8 unit load receiver input impedance (96k ? ), allowing up to 256 transceivers to be connected in parallel on one communication line. any combination of these devices and/or other rs-485 transceivers with a total of 32 unit loads or less can be connected to the line. reduced emi and reflections the um3085e is slew-rate limited, minimi zing emi and reducing reflections caused by improperly terminated cables. in general, a transm itter?s rise time relates directly to the length of an unterminated stub, which can be driven with only minor waveform reflections. the following equation expresses this rela tionship conservatively: length=t rise /(101.5ns/ft) where t rise is the transmitter?s rise time. a system can work well with longer unterminate d stubs, even with severe reflections, if the waveform settles out before the uart samples them. low-power shutdown mode low-power shutdown mode is initiated by bringing both r e ______ high and de low. in shutdown, the device typically draws only 2na of supply current. r e ______ and de may be driven simultaneously; the parts are guaranteed not to enter shutdown if r e ______ is high and de is low for less than 50ns. if the inputs are in this state for at least 600ns, th e 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 shut down. it takes drivers and receivers longer to become enabled from low-power shutdown mode (t zh(shdn ), t zl(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 circuits over the w hole common-mode voltage range. the second, a thermal shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature becomes excessive. line length vs. data rate the rs-485/rs-422 standard covers line lengths up to 4000 feet. for line lengths greater than 4000 feet, repeater is required. typical applications the um3085e, um3088e transceivers are designed for bidirectional data communications on multipoint bus transmission lines. to minimize refl ections, the line should be terminated at both ends in its characteristic impedance, and stub le ngths off the main line should be kept as short as possible.
________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 10/12 um3085e/um3088e package information sop8 outline drawing dimensions millimeters inches symbol 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: 4.903.90 ; 2. unit: mm; 3. general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation
________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 11/12 um3085e/um3088e dip8 outline drawing a3 a2 a1 a l dimensions millimeters inches symbol 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 pin) 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
________________________________________________________________________ http://www.union-ic.com rev.03jun.2013 12/12 um3085e/um3088e important notice the information in this document has been ca refully reviewed and is believed to be accurate. nonetheless, this document is subjec t to change 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: 2f, building 3, lane 647, songtao road, shanghai 201203 tel: 021-51093966 fax: 021-51026018 website: www.union-ic.com

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