1 Features

1• Exceeds Requirements of EIA-485 Standard

• Bus-Polarity Correction Within 76 ms (tFS)

• Data Rate: 300 bps to 250 kbps

• Works With Two Configurations:

– Failsafe Resistors Only

– Failsafe and Differential Termination Resistors

• Up to 256 Nodes on a Bus (1/8 Unit Load)

• SOIC-8 Package for Backward Compatibility

• Bus-Pin Protection:

– ±16 kV HBM protection

– ±12 kV IEC61000-4-2 Contact Discharge

– +4 kV IEC61000-4-4 Fast Transient Burst

2 Applications

• E-Metering Networks

• Industrial Automation

• HVAC Systems

• DMX512-Networks

• Process Control

• Battery-Powered Applications

• Motion Control

• Telecom Equipment

3 Description

The SN65HVD888 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 76 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 SN65HVD888 is available

in an SOIC-8 package, and is characterized from

–40°C to 125°C.