Features

? Exceeds Requirements of EIA-485 Standard

? Bus-Polarity Correction within 100 ms meet

SGCC spec

? Data Rate: 300 bps to 500 kbps

? Works with Two Configurations:

– Failsafe Resistors Only

– Failsafe and Differential Termination Resistors

? 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

– ±12 kV IEC61000-4-2 Contact Discharge

– ±15 kV IEC61000-4-2 Air Discharge

Applications

? E-Metering Networks

? HVAC Systems

? DMX512-Networks

Description

The TPT485N is a low-power RS-485 transceiver with

automatic bus-polarity correction and transient protection.

Upon hot plug-in, the device detects and corrects the

bus polarity within the first 100 ms of bus idling. On-chip

transient protection protects the device against IEC61000

ESD and EFT transients. This device has robust drivers

and receivers for demanding industrial applications. The

bus pins are robust to electrostatic discharge (ESD)

events, with high levels of protection to Human-Body

Model (HBM), Air-Gap Discharge, and Contact Discharge

specifications. The device combines a differential driver

and a differential receiver, which operate together from a

single 5-V power supply. The driver differential outputs

and the receiver differential inputs are connected

internally to form a bus port suitable for half-duplex

(two-wire bus) communication. The device features a

wide common-mode voltage range making the device

suitable for multi-point applications over long cable runs.

The TPT485N is available in SOP8 package, and is

characterized from –40°C to 125°C.