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________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 1 / 14 u m 3089 e 15kv esd - protected, fail - safe, hot - swappable a uto polarity reversal rs - 485 transceiver s um3089 e sop 14 general description the um 308 9 e series are +5.0v powered , 15kv esd protected, fail - safe , hot - swap pable , auto p olarity reversal rs - 485 transceivers. t h e device include s 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 i f all transmitters on a terminated bus are disab led (high impedance). the um3 08 9 e features reduced slew - rate driver that minimizes emi and reduces reflections caused by improperly terminated cables, allowing error - free data transmission up to 500kbps. all transmitter outputs and receiver inputs are protected to 15kv using the human body model and iec 6 1000 - 4 - 2, air - gap discharge . the um308 9 e include s cable auto - invert functions that reverse the polarity of the rs485 bus pins in case the cable is misconnec t e d. r eceiver s full fail - safe features are m aintained even when the r eceiver polarity has been revers ed. the transceivers typically draw 3 00a of supply current when unloaded, or when fully loaded with the drivers disabled , and 1 a of supply current when s hutdown . the device ha s a 1/8 - unit - load receiver input impedance that allows up to 256 tra nsceivers on the bus and is intended for half - duplex communications. the device also has over current protection and thermal shutdown protection. applications feat ures ? air - c ondition , building lighting and environmental control systems ? industrial - control local area networks ? profibus? and other rs - 485 based field bus networks ? high node count rs - 485 systems ? transceivers for emi - sensitive applications ? smart meters/au tomated meter reading systems ? automatic polarity reversal rs - 485 transceivers ? 1a shutdown current and 300ua receiver ? true fail - safe receiver and hot - swap pable ? enhanced slew - rate limiting ? allows up to 256 transceivers on the bus ? thermal shutdown ? current - limiting for driver overload protection . ? esd protection for rs - 485 i/o pins 15kv pin configurations top view xx: week code o rdering information part number marking code package type shipping qty um3089 eesd um3089 eesd sop14 2500pcs/13 inch tape & reel n c r o d e l 1 l 2 n c v c c 1 2 3 4 1 4 1 3 1 2 1 1 d i n c n c n c 5 6 9 1 0 g n d n c 7 8 r e 1 2 3 4 1 4 1 3 1 2 1 1 5 6 9 1 0 7 8 u m 3 0 8 9 e e s d x x
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 2 / 14 u m 3089 e 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 (v cc + 0.3v) v driver input voltage (di) - 0.3v to (v cc + 0.3v) v driver output voltage ( l1 , l2 ) - 7.5 to +12.5 v receiver input voltage ( l1 , l2 ) - 7.5 to +12.5 v receiver output voltage (ro) - 0.3v to (v cc + 0.3v) v t a amb ient temperature - 40 to +85 c t stg storage temperature range - 65 to + 1 6 0 c t l lead temperature for soldering 10 seconds +300 c dc electrical characteristics (v cc = + 5 v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = + 5 v and t a = +25c.) (note 1) p arameter s ymbol test c onditions m in t yp m ax u nit supply current supply current i cc no load, di = gnd or v cc de = v cc , /re =0v or v cc 0.3 ma de = 0v, /re =0v 0.25 supply current in shutdown mode i shdn de = gnd, /re = v c c 0.002 10 a logic input high voltage v ih1 de, di, /re 2.0 v input low voltage v il1 de, di, /re 0.4 v di input hysteresis v hys 300 mv driver differential driver output v od1 no load , figure 2 4.9 5 v differential driver output v od2 figure 2 , r l = 54 2.0 2.2 v change - in - magnitude of differential output voltage v od figure 2 , r l = 54 ; (note 2) 0.1 v driver common - mode output voltage v oc figure 2 , r l = 54 2.2 2.5 v change - in - magnitude of common - mode voltage v oc figure 2, r l = 54 ; ( note 2) 0.1 v driver short - circuit output current (note 3) i osd v out = - 7v - 250 ma v out = 12v 250
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 3 / 14 u m 3089 e dc electrical characteristics ( continued ) (v cc = + 5 v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = + 5 v and t a = + 25c.) (note 1) parameter symbol test conditions min typ max unit receiver receiver differential threshold voltage v th - 7vv 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 input current (l1 and l2) i in2 de = gnd, v cc = gnd or 5v v in = 12v 0.1 1.0 ma v in = - 7v 0.08 - 0.8 receiver output high volta ge v oh i o = - 1.5 ma, v id = 200mv v cc - 1.5 v receiver output low voltage v ol i o = 2.5 ma, v id = 200mv 0.4 v three - state output current at receiver i ozr 0v v o v cc 1 a receiver output short circuit current i osr 0v v ro v cc 8 60 ma thermal shu tdown temperature t shdn 140 c thermal shutdown hystersis t shdn 20 c esd protection esd protection for l1 , l2 human body model 15 kv iec61000 - 4 - 2 air - gap discharge 15 iec61000 - 4 - 2 contact discharge 8 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 cu rrent level applies to peak current just prior to fold back current limiting; minimum current level applies during current limiting.
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 4 / 14 u m 3089 e switching characteristics (v cc = + 5 v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = + 5 v and t a = +25c.) parameter symbol test conditions min typ max unit maximum data rate f max 500 k bps driver input - to - output t dplh figures 3 and 7 , r diff = 54 , c l1 = c l2 = 100pf 50 100 200 ns t dphl 50 100 200 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 1 00 200 500 ns driver enable to output high t dzh figures 4 and 8 , c l = 100pf, s2 closed 100 2500 ns driver enable to output low t dzl figures 4 and 8 , c l = 100pf, s1 closed 100 2500 ns driver disable time from low t dlz figures 4 and 8 , c l = 15pf, s1 closed 50 100 ns driver disable time from high t dhz figures 4 and 8 , c l = 15pf, s2 closed 50 100 ns receiver input to output t rplh , t rphl | v id | 2.0v; rise and fall time of v id 1 5ns 100 200 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 4 30 ns receiver enable to output low t rz l figures 5 and 10 , c l = 100pf, s1 closed 20 2 00 ns receiver enable to output high t rzh figures 5 and 10 , c l = 100pf, s2 closed 20 200 ns receiver disable time from low t rlz figures 5 and 10 , c l = 100pf, s1 closed 20 200 ns receiver disable time from high t rhz figures 5 and 10 , c l = 100pf, s2 closed 20 200 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 c losed 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 /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 sh utdown.
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 5 / 14 u m 3089 e non - polarity features t he polarities of driver and receiver are always kept the same status. when de= /re =logic 0 a nd ro is standing logic 0 for t s time, the polarities will be reversed automatically . parameter symbol test conditions min typ max u nit w ait ing t ime for i nverting t s de= /re =l, ro keep s l 150 200 250 ms pin description pin number symbol function 1 nc not connected. 2 ro receiver output. 3 /re receiver enable. drive /re low to enable receivers, ro is high impedance when /re is hi gh. drive /re high and de low to enter low - power shutdown mode. 4 de driver enable. drive de high to enable driver s . the outputs are high impedance when de is low. drive /re high and de low to enter low - power shutdown mode. 5 di driver input 6 nc not co nnected. 7 gnd ground 8 nc not connected. 9 nc not connected. 10 nc not connected. 11 l1 rs 485 receiver input and driver output pin. n ormal ly l2 is non - inverting b us i/o for transceiver ( r eferred as a in traditional rs485 t ransceiver) and l1 is in verting b us i/o for transceiver ( r eferred as b in traditional rs485 t ransceiver). under p olarity reversal status , l2 becomes inverting bus i/o and l1 becomes non - inverting bus i/o. 12 l2 13 nc not connected. 14 v cc power supply for rs - 485 transceiver
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 6 / 14 u m 3089 e rs - 485 communication function table table1. transmitting inputs outputs /re de di a b x h h/o h l x h l l h l l/o x z z h l/o x shutdown table2. receiving h: high, l: low, x: do not care, z: high impedance. v a : input voltage of rs485 non - inverting bus i/o terminal, v b : input voltage of rs485 inverting bus i/o terminal. inputs outputs /re de v id =v a - v b ro l x - 50mv h l x - 200mv l l x open/shorted h h h x z h l x shutdown
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 7 / 14 u m 3089 e typical ope rating characteristics (v cc =5v, driver output and receiver output no load, unless otherwise noted.) r load =5 4 r load =5 k r load =5 k
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 8 / 14 u m 3089 e r load =5 4 r load =5 4 t s
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 9 / 14 u m 3089 e typical operating circuit figure 1 . typi cal half - duplex non - polarity 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 tim ing test load l 1 l 2 r load / 2 r load / 2 v od v oc 1 k 1 k v cc s 1 s 2 + c rl 15 pf test point receive output l 1 l 2 di de 3 v v od 2 c l 2 c l 1 r diff + c l s 1 s 2 v cc driver output under test 500 ohm r d di de ro re r d di de ro re r d de ro re di b a l 1 l 2 l 1 l 2 r d de di ro re l 1 l 2 120 ohm 120 ohm 5 0 0 o h m 5 0 0 o h m + 5 v gnd l 1 l 2 master node slave node 1 slave node n terminal slave node all um 3089 e ' s l 1 l 2 pin can interchange each other ;
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 10 / 14 u m 3089 e figure 6 . receiver propagation delay test circuit figure 7 . driver propagation delays figure 8 . driver enable and disable times figure 9 . receiver propagation delays figure 10 . receiver en able and disable times ate v d r l 1 l 2 receiver output di 5 v l 1 0 v l 2 v o 1 . 5 v 1 . 5 v t dplh t dphl 1 / 2 v o 1 / 2 v o - v o v o 0 v v diff 90 % 90 % 10 % 10 % t df t dr v diff = v l 1 - v l 2 t skew = | t dplh - t dphl | output normally low output normally high de 5 v l 1 0 v l 2 1 . 5 v 1 . 5 v v ol v oh v ol v oh 2 . 3 v 2 . 3 v t dlz t dzl ( shdn ) , t dzl t dhz t dzh ( shdn ) , t dzh v ol + 0 . 5 v v oh - 0 . 5 v v oh v ol ro 1 v - 1 v l 1 l 2 1 . 5 v 1 . 5 v output input t rplh t rphl output normally low output normally high re 5 v 0 v ro 1 . 5 v v oh v ol 1 . 5 v 1 . 5 v t rlz t rzl ( shdn ) , t rzl t rhz t rzh ( shdn ) , t rzh v ol + 0 . 5 v v oh - 0 . 5 v 1 . 5 v
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 11 / 14 u m 3089 e detail description polarity reversal function with large node count rs485 network, it is common for some cable data lines to be wired backwards during installation. when this happens, the node is unable to communicate over network , and must be rewire d to the connector, which is time consuming. the um308 9 e simplifies this task by including an automatic polarity reversal function inside. upon um308 9 e power s up, when de= /re =logic low, if ro keeps logic low over a predefined time t s (i .e t s =200ms in um308 9 e), the chip reverse s its bus pins polarity, so l1 become s non - inverting, and l2 become s inverting. otherwise, the chip operates like any standard rs485 transceiver, and the bus pins have their normal polarity definition of l2 as non - inverting pin and l1 as inverting pin . union semi s unique automatic polarity reversal function is superior to that found on competing devices, because the receiver s full fail safe function is maintained, even when the rx polarity is reversed. fail - safe and hot - swap the um308 9 e 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 input threshold betw een - 50mv and - 200mv. if the differential receiver input voltage v id is greater than or equal to - 50mv, ro is logic high. if v id 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 threshold of um308 9 e, this results in logic high with a 50mv minimum noise margin, and this - 50mv to - 200mv threshold complies wi th the 200mv eia/tia - 485 standard. when cir cuit boards with rs485 transceiver are inserted into a hot or powered backplane, differential disturbances to the data bus can lead to data errors. upon initial circuit board insertion, the microprocessor undergoes its own power - up sequence. du ring this pe riod, the processor s logic output drivers are hig h impedance and unable to drive the de and /re inputs of these devices to a defined logic level. leakage currents up to 1 0 a from the high impedance state of processor s logic drivers could cause standard cmos enable inputs of a transceiver to drift to an incorrect logic level. additionally , parasitic circuit board capacitance could cause coupling of v cc or gnd to the enable inputs. without the hot - swap capability, these facts could improperly enable the transceiver s driver or receiver. when v cc rises, an internal pull down circuit holds de low and /re high. after the initial power up sequence, the pull down/pull up circuit becomes transparent, resetting the hot - swap tolerable input. this hot - swap input circuit enhances um308 9 e s performance in harsh environment application. 15kv esd protection all pins on um 308 9 e device include esd protection structures, and the family inc orporates advanced structures which allow the rs - 485 pins ( l1, l2 ) to survive esd events up to 15kv. the rs - 485 pins are particularly vulnerable to esd damage because they typically connect to an exposed port on the exterior of the finished product. the e sd structures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, c ircuits keep working without latch up. the esd protection can be tested in various ways and with reference to the ground pin . t he l1 , l2 are characterized for protection to the following limits: 15kv using the human body model and iec 6 1000 - 4 - 2 , air - gap discharge , and 8kv contact discharge. t he logic pin s (ro, /re , de, di) are characterized for protection to the following limits: 2kv using th e human body model .
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 12 / 14 u m 3089 e applications information n on - polarity transceiver when establish ed the n on - polarity rs - 485 net, you should pay attention to two conditions. first, a pair of bias r esistance (pull - up to +5v for r s - 48 5 a bus, p ush - down to gnd for rs - 485 b bus) mu st be required, usually be buil t in the master node, or independently , 500 ? resistance is recommend ed . t he other node s don t need bias resistance anymore . second, the transcei ver rat e must be higher than 100 bps or the maxim um transmitt ing time for low logic should be less than 100m s . 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. low - power shutdown mode low - power shutdown mode is initiated by bringing both /re high and de low. in shutdown, the dev ice typically draw s only 10u a of supply current. /re and de may be driven s imultaneously; 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 charact eristics 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 z l (shdn) ) than fr om 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 p rotection against short circuits over the whole common - mode voltage range (see typical operating characteristics) . 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 um308 9 e transceivers are designed for bidirectional data communications on multip oint bus transmission lines. to minimize reflections, the line should be terminated at both ends in its characteristic impedance, a nd stub lengths of the main line should be kept as short as possible.
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 13 / 14 u m 3089 e package information um 308 9 eesd sop 14 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 just 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 0 8 9 e e s d x x
________________________________________________________________________ http://www.union - ic.com rev.0 2 jan .20 14 14 / 14 u m 3089 e important notice the information in this document has been carefully reviewed and is believed to be accurate. nonetheless, this document is subject 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 reserves 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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