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Date: 21-05-13

high-rel RS-485/422 transceivers supporting data rates up to 20Mbps

Exar has unveiled nine high-rel RS-485/RS-422 transceivers supporting data rates up to 20Mbps in either full or half duplex configurations. The applications suggested includes remote utility metering, AC and DC motor drives, building automation, security systems, process control, and other industrial automation applications.

The analog 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 deliver 40% greater SNR (Signal-to-Noise Ratio) compared with standard RS-485/422, affording additional noise margin or extended cable lengths.

"These products provide our customers with greater assurance that their systems will operate correctly in the real world, not just in a clean lab environment," said Jack Roan, strategic marketing manager, Exar. "Industrial applications are highly unpredictable when it comes to noise, electromagnetic interference, cable length, or other power sources which could come in contact with the bus wiring. The XR3080-88X family provides an additional measure of safety for these types of installations."

Product Details:

The XR3080-88X family are 1-driver/1-receiver RS-485 devices that operate from a +4.5V to +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 250kbps and 1Mbps data rates), while the XR3086-88X drivers operate at high speed (20Mbps).

Devices with DE and RE pins include hot swap circuitry to prevent false transitions on the bus during powerup or live insertion, and can enter a 1nA low current shutdown mode for extreme power savings. The transceivers draw less than 600?A from a +5.0V supply, and typically only 300?A when idling with the receivers active.

Product Availability and Pricing: 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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