View UM3085E_8993850.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 1 / 12 u m 3085e/um3088e 15kv esd - protected, slew - rate - limited, fail - safe, true rs - 485 transceiver s um308 5 e /um3088e sop8 /dip8 general description the um 3085e, um3088e are 15kv esd - protected, high - speed transceivers for rs - 485 communication that contain one driver and one recei ver. t h e se device s f ea ture 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 disab led (h igh impedance). the um3 085 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. while partially slew - rate limited um3088e speeds up to 2.5 mbps. all devices feature enhanced esd protection. 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 transceivers typically draw 4 00a 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 tra nsceivers on the bus and are intended for half - duplex communications. applications f e atures ? rs - 485 transceivers ? level translators ? industrial - control local area networks ? transceivers for emi - sensitive applications ? esd protection for rs - 485 i/o pins 15kv ? true fail - safe receiver while maintaining eia/tia - 485 compatibility ? enhanced slew - rate limiting facilitates error - free data transmission ? 2na low - current shutdown mode ? - 7v to +12v common - mode input voltage range ? allows up to 256 transceivers on the bus ? thermal shutdown ? current - limiti ng for driver overload protection o rdering information part number operating temperature mark ing code packag ing type UM3085Eesa - 40 c to +85 c UM3085Eesa sop8 UM3085Eepa - 40 c to +85 c UM3085Eepa dip8 um3088eesa - 40 c to +85 c um3088eesa sop8 um3088eep a - 40 c to +85 c um3088eepa dip8 selection guide part number guaranteed date rate (mbps) low - power shutdown slew - rate limited driver/ receiver enable shutdown current (na) transceivers o n bus 15kv esd protection UM3085E 0.5 yes yes yes 2 256 yes um308 8e 2.5 yes yes yes 2 256 yes
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 2 / 12 u m 3085e/um3088e 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 volt age (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 + 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) parameter symbol test conditions min typ max unit supply current supply current i cc no l oad, di = gnd or v cc de=v cc , re ______ =0v or v cc 0.3 ma de=0v, re ______ =0 v 0.25 supply current in shutdown mode i shdn de=gnd, re ______ =v cc 0.002 10 a logic input high voltage v ih1 de, di, re ______ 2.0 v input low voltage v il1 de, di, re ______ 0.8 v di input hysteresis v hys UM3085E 100 mv driver differential driver output v od1 no load, figure 2 5 v differential driver ou tput v od 2 figure 2 , r= 50 od figure 2 , r= 50 o c figure 2 , r = 50 o c figure 2, r = 50 osd v out = - 7v - 250 ma v out = 12v 250
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 3 / 12 u m 3085e/um3088e 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 th v cm =0v 25 mv receiver input resistance r in - 7v cm in2 de=gnd, v cc =gnd or 5v v in = 12v 1.0 ma v in = - 7v - 0.8 receiver output high voltage v oh i o = - 1.5m a, 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 o cc 1 a receiver output short circuit current i osr 0v ro cc 8 60 ma esd protection esd protection for a, b human body model 15 kv iec61000 - 4 - 2 air discharge 15 iec61000 - 4 - 2 contact 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 othe rwise 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 fold back current limiting; minimum current level applies during current limiting.
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 4 / 12 u m 3085e/um3088e switching characteristics (UM3085E) (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 kbps driver input - to - output t dplh figure 3 and 7 , r diff = 54 , c l1 = c l2 = 100pf 250 720 1000 ns t dphl 250 720 1000 driver output skew | t dplh - t dphl | t dskew figure 3 and 7 , r diff = 54, c l1 = c l2 = 100 pf 3 100 ns driver rise or fall time t dr , t df figure 3 and 7 , r diff = 54, c l1 = c l2 = 100pf 200 530 750 ns driver enable to output high t dzh figure 4 and 8 , c l = 100pf, s2 c losed 2500 ns driver enable to output low t dzl figure 4 and 8 , c l = 100pf, s1 c losed 2500 ns driver disable time from low t dlz figure 4 and 8 , c l = 15pf, s1 c losed 100 ns driver disable time from high t dhz figure 4 and 8 , c l = 15pf, s2 c losed 100 ns receiver input to output t rplh , t rphl |v id | 2.0v , r ise and f all t ime of v id 15ns 127 200 ns differential receiver skew |t rplh - t rphl | t rskd figure 6 and 9 , |v id | 2.0v , r ise and f all t ime of v id 15ns 3 30 ns receiver enable to output low t rzl figure 5 and 10 , c l = 100pf, s1 c losed 20 50 ns rece iver enable to output high t rzh figure 5 and 10 , c l = 100pf, s2 c losed 20 50 ns receiver disable time from low t rlz figure 5 and 10 , c l = 100pf, s1 c losed 20 50 ns receiver disable time from high t rhz figure 5 and 10 , c l = 100pf, s2 c losed 20 50 ns time to shutdown t shdn (note 4 ) 50 200 600 ns driver enable from shutdown to output high t dzh(shdn) figure 4 and 8 , c l = 15pf, s2 c losed 4500 ns driver enable from shutdown to output low t dzl(shdn) figure 4 and 8 , c l = 15pf, s1 c losed 4500 ns receiver enable f rom shutdown to output high t rzh(shdn) figure 5 and 10 , c l = 100pf, s2 c losed 3500 ns receiver enable from shutdown to output low t rzl(shdn) figure 5 and 10 , c l = 100pf, s1 c losed 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 i s guaranteed to have entered shutdown.
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 5 / 12 u m 3085e/um3088e switching characteristics (um3088e) (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 2.5 mbps driver input - to - output t dplh figure 3 and 7, r diff = 54 , c l1 = c l2 = 100pf 34 60 ns t dphl 34 60 driver output skew | t dplh - t dphl | t dskew figure 3 and 7 , r diff = 54, c l1 = c l2 = 100 pf 2.5 10 ns driver rise or fall time t dr , t df figure 3 and 7 , r diff = 54, c l1 = c l2 = 100pf 14 25 ns driver enable to output high t dzh figure 4 and 8 , c l = 100pf, s2 c losed 150 ns driver enable to output low t dzl figure 4 and 8 , c l = 100pf, s1 c losed 150 ns driver disable time from low t dlz figure 4 and 8 , c l = 15pf, s1 c losed 100 ns driver disable time from high t dhz figure 4 and 8 , c l = 15pf, s2 c losed 100 ns receiver input to output t rplh , t rphl |v id | 2.0v, r ise and f all t ime of v id 15ns 106 150 ns differential receiver skew | t rplh - t rphl | t rskd figure 6 and 9 , |v id | 2.0v , r ise and f all t ime of v id 15ns 0 10 ns receiver enable to output low t rzl figure 5 and 10 , c l = 100pf, s1 c losed 20 50 ns rece iver enable to output high t rzh figure 5 and 10 , c l = 100pf, s2 c losed 20 50 ns receiver disable time from low t rlz figure 5 and 10 , c l = 100pf, s1 c losed 20 50 ns receiver disable time from high t rhz figure 5 and 10 , c l = 100pf, s2 c losed 20 50 ns time to shutdown t shdn (note 4 ) 50 200 600 ns driver enable from shutdown to output high t dzh(shdn) figure 4 and 8 , c l = 15pf, s2 c losed 250 ns driver enable from shutdown to output low t dzl(shdn) figure 4 and 8 , c l = 15pf, s1 c losed 250 ns receiver enable fro m shutdown to output high t rzh(shdn) figure 5 and 10, c l =100pf, s2 closed 3500 ns receiver enable from shutdown to output low t rzl(shdn) figure 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 shutdown.
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 6 / 12 u m 3085e/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 wil l be low. 2 re ______ receiv er output enable. drive re ______ low to enable r eceiver, 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 driver s . 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 - i nverting receiver inpu t and non - i nverting driver output . 7 b inverting receiver input and inverting driver output . 8 v cc power supply for rs - 485 t ransceiver . rs - 485 communication function table table1. transmit t ing inputs outputs mode re ______ de di b a 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 i mpedance table2. receiving inputs outputs mode re ______ de a, b ro 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 i mpedance
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 7 / 12 u m 3085e/um3088e typical operating circuit figure 1 . typical half - duplex rs - 485 net work 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 pr opagation delay test circuit r d d i d e r o r e r d d i d e r o r e r d d e r o r e d i b a b a b a r d d e d i r o r e b a 1 2 0 o h m 1 2 0 o h m b a m a s t e r n o d e s l a v e n o d e 1 s l a v e n o d e n t e r m i n a l s l a v e n o d e b a 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 receiver output b a 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 ate v d r b a receiver output
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 8 / 12 u m 3085e/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 descriptio n the UM3085E, um3088e high - speed transceivers for rs - 485 communication 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 or shorted, or when the y are connected to a terminated transmission line with all drivers disabled. the um3 085e features reduced slew - rate driver that minimizes emi and reduces reflections caused by improperly terminated cables, allowing error - free data transmission up to 500kbp s. 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 against excessive power dissipation. when ac tivated, the thermal shutdown circuitry places the driver outputs into a high impedance state. fail - safe the um3 085e, 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 - 20 0mv, 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, um3088e, this results in a logic high with a 50 mv 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 agai nst electrostatic discharges encountered during 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 are tested with reference to the ground pin in a powered - down condition. they are tested to 15kv using the human body model. di 5 v b 0 v a 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 b - v a t skew = | t dplh - t dphl | output normally low output normally high de 5 v b 0 v a 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 b a 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 5 sep .20 1 5 9 / 12 u m 3085e/um3088e applications information 256 transceivers on the bus the s tandard rs - 485 receiver input imped ance 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 li ne. 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, minimizing emi and reducing reflections caused by impro perly terminated cables. in general, a transmitter 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 relationship conservatively: length=t rise / (101.5ns/ft) where t rise is the transmitter s rise time. a system can work well with longer unterminated stubs, even with severe reflections, if the waveform settles out before the uart samples them. low - power shutdown mode low - power shutdown mode is in itiated by bringing both re ______ high and de low. in shutdown, the dev ice typically draw s only 2n a 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 shut down. it takes drivers and receivers longer to become enabled from low - power shutdown mode (t zh(shdn ), t z l (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 whole 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 um308 5e, um3088e transceive rs are designed for bidirectional data communications on multipoint bus transmission lines. to minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as p ossible.
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 10 / 12 u m 3085e/um3088e package information sop8 outline drawing dimensions symbol millimeters inches min max min max a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.004 0.010 a2 1.35 1.55 0.053 0.061 b 0.33 0.51 0.013 0.020 c 0.17 0.25 0.006 0.010 d 4.70 5.10 0.185 0.200 e 3.80 4.00 0.150 0.157 e1 5.80 6.2 0 0.228 0.244 e 1.27 bsc 0.050 bsc l 0.40 1.27 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 x x x x x x x x x x x x
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 11 / 12 u m 3085e/um3088e 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 d d 1 a 3 a 2 a 1 a l e b b 1 e 1 e e a e b c t o p v i e w e n d v i e w s i d e v i e w
__________________________________________________________ ______________ http://www.union - ic.com rev.0 5 sep .20 1 5 12 / 12 u m 3085e/um3088e green compliance unio n semiconductor is committed to environmental excellence in all aspects of its operations including meeting or exceeding regulatory requirements with respect to the use of hazardous substances. numerous successful programs have been implemented to reduce t he use of hazardous substances and/or emissions. all union components are compliant with the rohs directive, which helps to support customers in their compliance with environmental directives. for more green compliance information, please visit: http://www.union - ic.com/index.aspx?cat_code=rohsdeclaration important notice the information in this document has been carefully reviewed and is believed to be accurate. nonetheless, thi s 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 organizati on 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 : unit 606, no.570 sheng xia r oa d, shanghai 2012 10 tel: 021 - 51093966 fax: 021 - 51026018 website: www.union - ic.com

▲Up To Search▲

Price & Availability of UM3085E

	To Download UM3085E Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .