3.3/5V 20Mbps RS-485 transceivers provide ±60V fault protection

11th February 2016
Jordan Mulcare

Exar Corporation introduces a new family of ±60V fault protected RS-485/RS-422 (TIA-485/TIA-422) transceivers able to withstand direct shorts and achieve overvoltage protection with no external components. Designed for improved performance in noisy industrial environments and increased tolerance to system faults, these transceivers simplify design in building automation, HVAC networks, energy metering, process control and other industrial automation applications.

At initial launch, the family includes four parts: XR33053, XR33152, XR33156 and XR33158. The XR33156 is the most feature-rich ±60V tolerant device on the market with cable invert control to correct for reversed bus pins and a low voltage logic pin, eliminating the need for a level shifter in low voltage applications. Other inherent protection features include ±25V common mode voltage, hot swap glitch protection, overload protection and enhanced receiver fail-safe protection for open, shorted or terminated but idle data lines.

"These transceivers protect against wiring faults up to ±60V and simultaneously protect against ESD events exceeding ±15kV," said Dale Wedel, Vice President, analogue products, Exar. "This family is a welcome addition to Exar’s rich portfolio of serial transceiver products and enhances our excellent support to our broad industrial customer base."

The XR33053, XR33152, XR33156 and XR33158 operate over a wide 3 to 5.5V supply voltage range and feature the industry’s lowest standby current of 1uA (max), 1nA (typ). They support data rates up to 20Mbps in either full- or half-duplex configurations, exceed ±15kV ESD protection on the bus pins and operate over the standard industrial temperature range of -40 to 85˚C.

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