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Rugged transceivers from Exar target industrial market

29 May 2013

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Exar Corp. has released what it says is a family of high reliability RS-485/RS-422 transceivers intended for harsh industrial environments with enhanced fault and voltage protection. Consisting of nine devices, the XR3080-88X family supports data rates up to 20Mb/s in either full or half duplex configurations, and is geared for remote utility metering, AC and DC motor drives, building automation, security systems, process control, and other industrial automation applications, detailed the firm.

The XR3080-88X family also offers extremely low power consumption that makes them ideal for high voltage isolated RS-485 applications by facilitating a smaller and lower cost transformer in the isolation power supply, added Exar.

The analogue bus pins can withstand direct shorts up to ±18V, and are protected from ESD events beyond ±15kV (IEC 61000-4-2 Air Gap Discharge). The Profibus compliant output drivers claim to deliver 40% greater SNR compared with standard RS-485/422, affording additional noise margin or extended cable lengths.

The XR3080-88X family are 1-driver/1-receiver RS-485 devices that operate from a 4.5-5.5V power supply. They feature enhanced ESD protection to ±15kV (IEC 61000-4-2 Air Gap Discharge, ±8kV IEC 61000-4-2 Contact Discharge, ±15kV Human Body Model), as well as short circuit current limiting and thermal shutdown. The XR3080-85X drivers are slew limited for reduced EMI and error-free communication over long or unterminated data cables (at 250kb/s and 1Mb/s data rates), while the XR3086-88X drivers operate at high speed (20Mb/s).

Devices with DE and RE pins include hot swap circuitry to prevent false transitions on the bus during power up or live insertion, and can enter a 1nA low current shutdown mode for extreme power savings. The transceivers draw less than 600μA from a 5V supply, and typically only 300μA when idling with the receivers active.

The XR3080-88X are available immediately in industry standard 8 NSOIC and 14 NSOIC packages. The suggested retail price for the XR3080X-88X family is $1.20 in 1,000-unit quantities.

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