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

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

Description
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
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. 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.