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RS-485 Transceivers

TP8485E - ± 18K ESD Protection, Full Fail-Safe RS-485 Transceiver


 Exceeds Requirements of EIA-485 Standard
 Hot Plug Circuitry - Tx and Rx Outputs Remain

      Three-State During Power-up/Power-down

 Data Rate: 300 bps 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:
       —  ±18 kV HBM protection
       —  ±13 kV IEC61000-4-2 Contact Discharge
       —  +4 kV IEC61000-4-4 Fast Transient Burst

Typical Application

The TP8485E are IEC61000 ESD protected, 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 ±18kV ESD strikes without latch-up.

Transmitters in this family deliver exceptional differential output voltages (2.5V min/5Vcc), into the RS-485 required 54Ω load, for better noise immunity, or to allow up to eight 120Ω terminations 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. Rxoutputs 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.


 E-Metering Networks
 Industrial Automation
 HVAC Systems
 Process Control
 DMX512-Networks
 Battery-Powered Applications

Application Notes
3PEAK_Selection Guide