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.