Fremont, Calif. -- Exar Corp. introduces the XR3070-78X family of ruggedized RS-485/RS-422 transceivers for harsh industrial environments. The analog bus pins can withstand direct shorts up to +/-18V and are protected from electrostatic discharge (ESD) events exceeding IEC Level 4. Operating from 3.3V with a 300-uA idle current, these devices consume half the power of a comparable +/-18V fault tolerant solution. The family of nine devices supports data rates up to 20 Mbps in either full or half duplex configurations. Applications include energy metering, building automation, security systems, process control, and other industrial automation applications.
The XR3070-78X are 1-driver/1-receiver RS-485/422 devices operating from a 3.0V to 3.6V power supply (3.3V +/-10%) and are fully compliant to the TIA/EIA-485 and TIA/EIA-422 standards. The bus pins feature ESD protection to +/-15kV (+/-15kV IEC 61000-4-2 Air Gap Discharge, +/-8kV IEC 61000-4-2 Contact Discharge, +/-15kV Human Body Model); non-bus pins are protected up to +/-4kV Human Body Model.
"ESD and over-voltage events are leading causes of field failures and equipment returns in industrial communication applications," said Jack Roan, product marketing manager, Exar, in a statement. "The XR3070-78X family delivers robust protection in both these areas, providing our customers with an additional measure of safety against installation errors or cable faults and at the same time significantly reducing system power consumption."
The XR3070-78X provides insurance against wiring faults up to +/-18V, while protecting against ESD events exceeding IEC Level 4. Exar said the "common practice in these applications is to route 15Vdc or 12Vac power in the same cable pack as the RS-485 data lines. Damaged cables or incorrect wiring can expose the transceiver to these voltages, which will permanently damage standard RS-485 devices."
Availability: The XR3070-78X family is available in industry standard 8 NSOIC and 14 NSOIC packages.
Pricing: The suggested retail price for the XR3070-78X family is $1.25 in quantities of 1,000.