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TP8485E-SR ±12K ESD Protection, Full Fail-Safe RS-485 Transceiver

　　The TP8485E are 3V~5.5V powered transceivers that meet the RS-485 and RS-422 standards for balanced communication.Driver outputs and receiver inputs are protected against±12kV ESD strikes without latch-up.Transmitters in this family deliver exceptional differential output voltages(2.5V min/5Vcc),into the RS-485 required 54Ωload,for better noise immunity,or to allow up to eight 120Ωterminations in“star”topologies.These devices have very low bus currents so they present a true“1/8 unit load”to the RS-485 bus.This allows up to 256 transceivers on the network without using repeaters.Receiver(Rx)inputs feature a“Full Fail-Safe”design,which ensures a logic high Rx output if Rx inputs are floating,shorted,or on a terminated but undriven bus.Rx outputs feature high drive levels-typically 25mA VOL=1V(to ease the design of optocoupled isolated interfaces).The TP8485E is available in an SOIC-8 and MSOP-8 package,and is characterized from–40°C to 125°C.

　　Features

　　-Exceeds Requirements of EIA-485 Standard

　　-Hot Plug Circuitry-Tx and Rx Outputs Remain

　　Three-State During Power-up/Power-down

　　-Data Rate:Up to 250 kbps

　　-Full Fail-safe(Open,Short,Terminated)

　　Receivers

　　-Up to 256 Nodes on a Bus(1/8 unit load)

　　-Wide Supply Voltage 3V to 5.5V

　　-SOIC-8 Package for Backward Compatibility

　　-Bus-Pin Protection:

　　–±12 kV HBM protection