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.