unisonic technologies co., ltd UTRS3088 preliminary cmos ic www.unisonic.com.tw 1 of 8 copyright ? 2015 unisonic technologies co., ltd qw-r113-012.a fail-safe, 1.0mbps, rs-485 / rs-422 transceivers with 15kv esd-protected ? description the utc UTRS3088 is a half-duplex transceiver designed for rs-485 data bus network, which c ontains one transmitter and one receiver. the utc UTRS3088 features a fail-safe receiver, which guarantees the receiver to output hi gh when the receiver inputs are open, short or idle. the utc UTRS3088 also features a hot-swap glitch free protection circuits which guarantee outputs of both the transmitter and the receiver in a high impedance st ate during the power up period. so that the large short current from power to ground will be disable by glitch free function, which will save the power and enhance the efficiency of the power up. the utc UTRS3088 is optimized for signal rates up to 1.0mbps with differential voltage of 2.3v. the utc UTRS3088 also has the thermal shutdown function w hen the temperature is over 150 and the protection of the current limita tion in the transmitter to protect the itself from the damage by the sy stem-fault conditions during normal operation. ? features * meet the requirements of the eia/tia-485 standards. * 5.0v single power supply. * 1a low-current shutdown mode. * hbm 15kv esd protection. * true fail-safe receiver while maintaining eia/tia-485 compatibility. * hot-swap glitch free protection on control inputs. * up to 256 transceivers on the bus. * maximum baud rate up to 1.0mbps. * transmitter short circuit current limit. * thermal shutdown for overload protection. ? ordering information ordering number package packing UTRS3088g-s08-r sop-8 tape reel UTRS3088g-s08-r (1)packing type (2)package type (1) r: tape reel (2) s08: sop-8 (3) g: halogen free and lead free (3)green package
UTRS3088 preliminary cmos ic unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r113-012.a ? marking ? pin configuration 1 2 3 4 8 7 6 5 ro reb de di vcc b a gnd ? pin description pin no. pin name description 1 ro receiver output: when reb is low and if (a-b) -50mv, ro is high; if (a-b) -200mv, ro is low. 2 reb receiver output enable: reb is low to enabl e the receiver; reb is high to disable the receiver. 3 de transmitter output enable: de is high to enable the transmitter; de is low to disable the transmitter. 4 di transmitter input: when de is high, a low on di forces a output low and b output high. similarly, a high on di forces a output high and b output low. 5 gnd ground pin. must be connected to 0v. 6 a non-inverting receiver input and non-inverting transmitter output 7 b inverting receiver input and inverting transmitter output 8 vcc power supply input 5.0v.
UTRS3088 preliminary cmos ic unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r113-012.a ? block diagram 1 2 3 4 8 7 6 5 ro reb de di vcc b a gnd tx rx
UTRS3088 preliminary cmos ic unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r113-012.a ? absolute maximum rating parameter symbol ratings unit power supply v cc v cc -0.3~8.0 v control input voltage reb, de -0.3~ (v cc +0.3) v receiver input voltage a, b 13 v receiver output voltage ro -0.3~ (v cc +0.3) v transmitter output voltage a, b 13 v transmitter input di -0.3~ (v cc +0.3) v operating temperature t op -40~+85 c storage temperature t stg -65~+150 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? dc electrical characteristics (v cc =5.0v 5% with t a = t min to t max , , unless otherwise specified. typical values are at v cc =5.0v and t amb =25c.) parameter symbol test conditions min typ max unit transmitter differential transmitter output v od1 no load 5.0 v differential transmitter output v od2 fig.1, r l =27 ? 1.5 v change in magnitude of differential output voltage ? v od fig.1, r l =27 ? 0.2 v transmitter common- mode output voltage v oc fig.1, r l =27 ? 3.0 v change in magnitude of common- mode voltage ? v oc fig.1, r l =27 ? 0.2 v input high voltage v ih de, di, reb 2.0 v input low voltage v il de, di, reb 0.8 v input current i in1 di 1 a input current i in2 de, reb 50 a di input hysteresis v hys 100 mv input current (a and b) i in3 de=gnd, vcc=gnd or 5.25v v in =12v 125 a v in =-7v -75 a transmitter short-circuit output current i os -7v v out v cc -250 ma 0v v out 12v 250 ma receiver receiver differential threshold voltage v th -7v v 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 =4ma, v id =-200mv 0.5 v three- state output current at receiver i ozr 0.4v v cm 2.4v 1 a receiver input resistance r in -7v v cm +12v 96 k ? receiver output short-circuit current i osr fig.6 , 0v v ro vcc 7 95 m supply current supply current i cc no load, reb=gnd, di=vcc or gnd. de=v cc 420 600 a de=gnd 320 500 a supply current in shutdown mode i shdn reb=v cc , de=gnd 1.0 15 a
UTRS3088 preliminary cmos ic unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r113-012.a ? switching characteristics (v cc =5.0v 5% with t a = t min to t max , unless otherwise specified. typical values are at v cc =5.0v and t amb =25c.) parameter symbol test conditions min typ max unit transmitter input to output t dplh , t dphl fig.2 and 7, r diff =54 ? , c l1 =c l2 = 100pf 70 200 ns transmitter output skew | t dplh - t dphl | t dskew fig.2 and 7, r diff =54 ? , c l1 =c l2 = 100pf 10 ns transmitter rise or fall time t df , t dr fig.2 and 7, r diff =54 ? , c l1 =c l2 = 100pf 40 150 ns maximum data rate f ma x 1.0 mbps transmitter enable to output low t dzl fig.4 and 8, c dl =100pf, s1 closed 150 ns transmitter enable to output high t dzh fig.4 and 8, c dl =100pf, s2 closed 150 ns transmitter disable time from low t dlz fig.4 and 8, c dl =15pf, s1 closed 150 ns transmitter disable time from high t dhz fig.4 and 8, c dl =15pf, s2 closed 150 ns receiver input to output t rplh , t rphl fig.5 and 9 , |v id | 2.0v; rise and fall time of v id 15ns 900 1200 ns | t rplh ? t rphl | different receiver skew t rskd fig.5 and 9 , |v id | 2.0v; rise and fall time of v id 15ns 10 ns receiver enable to output low t rzl fig.3 and 10, c rl =100pf, s1 closed 60 150 ns receiver enable to output high t rzh fig.3 and 10, c rl =100pf, s2 closed 60 150 ns receiver disable time from low t rlz fig.3 and 10, c rl =100pf, s1 closed 60 150 ns receiver disable time from high t rhz fig.3 and 10, c rl =100pf, s2 closed 60 150 ns time to shutdown t shdn 500 1000 ns transmitter enable from shutdown to output low t dzl(shdn) fig.4 and 8, c dl =15pf, s1 closed 2500 ns transmitter enable from shutdown to output high t dzh(shdn) fig.4 and 8, c dl =15pf, s2 closed 2500 ns receiver enable from shutdown to output low t rzl(shdn) fig.3 and 10, c rl =100pf, s1 closed 3500 ns receiver enable from shutdown to output high t rzh(shdn) fig.3 and 10, c rl =100pf, s2 closed 3500 ns
UTRS3088 preliminary cmos ic unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r113-012.a ? function table table 1 transmitting inputs outputs reb de di a b x 1 0 0 1 x 1 1 1 0 0 0 x high-z high-z 1 0 x shutdown table 2 receiving inputs outputs reb de a-b ro 0 x -0.05v 1 0 x -0.2v 0 0 x open/shorted 1 1 1 x high-z 1 0 shutdown x = don?t care shutdown mode, driver and receiver outputs high impedance
UTRS3088 preliminary cmos ic unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r113-012.a ? test circuit rx a b reb c rl 1k s1 s2 1k vcc tx vdc de a b c dl 500 s1 s2 vcc fig. 3 receiver enable/disable timing test circuit fig. 4 transmitter enable/disable timing test circuit
UTRS3088 preliminary cmos ic unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r113-012.a ? test circuit (cont.) voh vol ro a -1v b 1.5v output t rphl input 1.5v t rplh 3v 0v reb v cc ro v ol v oh ro 0 1.5v t rzl 1.5v 1.5v t rzh output normally low output normally high t rlz 1.5v v ol +0.5v v oh -0.5v t rhz fig. 9 receiver propagation delays fig. 10 receiver enable and disable times utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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