Features

? Exceeds Requirements of EIA-485 Standard

? Data Rate: 500 kbps

? Support Failsafe function

? Low Power Consumption: < 1 μA Standby

Supply Current

? Large Receiver Hysteresis: 60mV

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

? Wide Supply Voltage 4.5V to 5.5V

? SOP8 Package for Backward Compatibility

? Bus-Pin Protection:

? ±18 kV HBM protection

? ±12 kV IEC61000-4-2 Contact Discharge

Applications

? E-Metering Networks

? HVAC Systems

? Video Surveillance Systems

? DMX512-Networks

Description

The TPT485E is 4.5V~5.5V powered transceivers that

meet the RS-485 and RS-422 standards for balanced

communication. Driver outputs and receiver inputs are

protected against ±18 kV ESD strikes without latch-up.

Transmitters in this family deliver exceptional differential

output voltages as 2.5V (min) in 5Vcc power supplier, into

the RS-485 required 54Ω load, for better noise immunity.

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.

The TPT485E is available in an SOP8 package, and is

characterized from –40°C to 125°C.