unisonic technologies co., ltd UTRS485 preliminary cmos ic www.unisonic.com.tw 1 of 8 copyright ? 2015 unisonic technologies co., ltd qw-r113-011.c fail-safe, 2.5mbps, rs-485 / rs-422 transceivers with 15kv esd-protected ? description the utc UTRS485 is a half-duplex transceiver designed for rs-485 data bus network, which c ontains one transmitter and one receiver. the utc UTRS485 features a fail-safe receiver, which guarantees the receiver to output hi gh when the receiver inputs are open, short or idle. the utc UTRS485 also features a hot-swap glitch free protection circuits which guarantee outputs of both the transmitter and the receiver in a high impedance state dur ing 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 UTRS485 is optimized for signal rates up to 2.5mbps with differential voltage of 2.3v. the utc UTRS485 also has the thermal shutdown function when t he 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. * 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. * driver short circuit current limit. * thermal shutdown for overload protection. sop-8 ? ordering information ordering number package packing UTRS485g-s08-r sop-8 tape reel UTRS485g-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
UTRS485 preliminary cmos ic unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r113-011.c ? marking ? pin configuration 1 2 3 4 8 7 6 5 ro re de di v cc b a gnd ? pin description pin no. pin name description 1 ro receiver output: if a>b by 200mv, ro w ill be high; if a UTRS485 preliminary cmos ic unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r113-011.c ? block diagram 1 2 3 4 8 7 6 5 ro re de di v cc b a gnd tx rx
UTRS485 preliminary cmos ic unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r113-011.c ? absolute maximum rating parameter symbol ratings unit supply voltage v cc 12 v control input voltage ( re , de) -0.5~(v cc +0.5) v driver input voltage (di) di -0.5~(v cc +0.5) v driver output voltage (a, b) -8~+12.5 v receiver input voltage (a, b) -8~+12.5 v receiver output voltage (ro) -0.5~(v cc +0.5) v continuous power dissipation (t a =+70c) derate 5.88mw/c above +70c 471 mw lead temperature (soldering, 10sec) t l +300 c operating temperature ranges t opr -40~+85 c storage temperature range t stg -65~+160 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%, t a =t min to t max , unless otherwise noted. (note 1, 2) parameter symbol test conditions min typ max unit differential driver output (no load) v od1 5.0 v r=50 ? (rs-422) 2.0 v differential driver output (with load) v od2 fig.1, r=27 ? (rs-485) 1.5 5 v change in magnitude of driver differential output voltage for complementary output states ? v od fig.1, r=27 ? or 50 ? 0.2 v driver common-mode output voltage v oc fig.1, r=27 ? or 50 ? 3.0 v change in magnitude of driver common-mode output voltage for complementary output states ? v od fig.1, r=27 ? or 50 ? 0.2 v input high voltage v ih1 de, di, re 2.0 v input low voltage v il1 de, di, re 0.8 v input current i in1 de, di, re 2.0 a v in =12v 1.0 ma input current (a, b) i in2 de=0v; v cc =0v or 5.25v v in =-7v -0.8 ma receiver differential threshold voltage v th -7v v cm +12v -0.2 0.2 v receiver input hysteresis ? v th v cm =0v 70 mv receiver output high voltage v oh i o =-4ma, v id =200mv 3.5 v receiver output low voltage v ol i o =4ma, v id =-200mv 0.5 v three-state (high impedance) output current at receiver i ozr 0.4v v o 2.4v 1.0 a receiver input resistance r in -7v v cm +12v 12 k ? de=v cc 500 900 a no-load supply current (note 3) i cc re =0v or v cc de=0v 300 500 a driver short-circuit current, v o =high i osd1 -7v v o 12v (note 4) 35 250 ma driver short-circuit current, v o =low i osd2 -7v v o 12v (note 4) 35 250 ma receiver short-circuit current i osr 0v v o v cc 7 95 ma
UTRS485 preliminary cmos ic unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r113-011.c ? switching characteristics (v cc =+5.0v 5%, t a =t min to t max , unless otherwise noted.) (note 1, 2) parameter symbol test conditions min typ max unit t plh 10 50 100 ns driver input to output t phl fig.3 and 5, r diff =54 ? , c l1 =c l2 =100pf 10 50 100 ns driver output skew to output t skew fig.3 and 5, r diff =54 ? , c l1 =c l2 =100pf 10 ns driver rise or fall time t dr , t df fig.3 and 5, r diff =54 ? , c l1 =c l2 =100pf 3 15 40 ns driver enable to output high t zh fig.4 and 6, c l =100pf, s2 closed 80 150 ns driver enable to output low t zl fig.4 and 6, c l =100pf, s1 closed 80 150 ns driver disable time from low t lz fig.4 and 6, c l =15pf, s1 closed 80 150 ns driver disable time from high t hz fig.4 and 6, c l =15pf, s2 closed 80 150 ns receiver input to output t plh , t phl fig.3 and 7, r diff =54 ? , c l1 =c l2 =100pf 20 500 1000 ns |t plh - t phl | differential receiver skew t skd fig.3 and 7, r diff =54 ? , c l1 =c l2 =100pf 100 ns receiver enable to output low t zl fig.2 and 8, c rl =15pf, s1 closed 30 60 ns receiver enable to output high t zh fig.2 and 8, c rl =15pf, s2 closed 30 60 ns receiver disable time from low t lz fig.2 and 8, c rl =15pf, s1 closed 30 60 ns receiver disable time from high t hz fig.2 and 8, c rl =15pf, s2 closed 30 60 ns notes: 1. all currents into the devic e are positive; all current s out of the device are negat ive. all voltages are referenced to device ground unless otherwise specified. 2. all typical specifications are given for v cc =5v and t a =+25c 3. supply current specification is valid for loaded transmitters when de=0v 4. applies to peak current
UTRS485 preliminary cmos ic unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r113-011.c ? function table table 1 transmitting inputs outputs re de di b a x 1 1 0 1 x 1 0 1 0 0 0 x high-z high-z 1 0 x high-z high-z table 2 receiving inputs outputs re de a-b ro 0 0 +0.2v 1 0 0 -0.2v 0 0 0 inputs open 1 1 0 x high-z x = don?t care high-z = high impedance
UTRS485 preliminary cmos ic unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r113-011.c ? test circuit y z v od r r v oc fig. 1 driver dc test load c rl 1k s1 s2 v cc fig. 2 receiver timing test load 1k + 15pf test point receiver output c l 500 s1 s2 v cc fig. 4 driver timing test load y z r diff c l1 c l2 fig. 3 driver/receiver timing test circuit di de 3v v id + output under test ro re a b v oh v ol ro a-b 1.5v output t phl input 1.5v t plh 3v 0v re v cc ro ro 0v 1.5v t zl(shdn) , t zl 1.5v 1.5v t zh(shdn) , t zh output normally low output normally high t lz 1.5v v ol +0.5v v oh -0.5v t hz fig. 7 receiver propagation delays fig. 8 receiver enable and disable times v id -v id 0v 0v
UTRS485 preliminary cmos ic unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r113-011.c ? typical application circuit 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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