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The ISL31483E and ISL31485E are fault protected, 5V powered differential transceivers that exceed the RS-485 and RS-422 standards for balanced communication. The RS-485 transceiver pins (driver outputs and receiver inputs) are fault protected up to ±60V. Additionally, the extended common mode range allows these transceivers to operate in environments with common mode voltages up to ±25V (>2x the RS-485 requirement), making this fault protected RS-485 family one of the most robust on the market.

Transmitters deliver an exceptional 2.5V (typical) differential output voltage into the RS-485 specified 54Ω load. This yields better noise immunity than standard RS-485 ICs, or allows up to six 120Ω terminations in star network topologies.

Receiver (Rx) inputs feature a “Full Fail-Safe” design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus.

The ISL31483E and ISL31485E include cable invert functions that reverse the polarity of the Rx and/or Tx bus pins in case the cable is misconnected. Unlike competing devices, Rx full fail-safe operation is maintained even when the Rx input polarity is switched.

Key Features

• Fault protected RS-485 bus pins:up to ±60V
• Extended common mode range: ±25V More than twice the range required for RS-485
• Cable invert pins corrects for reversed cable connections while maintaining Rx full fail-safe functionality
• Full fail-safe (open, short, terminated) RS-485 receivers
• 1/4 unit load (UL) for up to 128 devices on the bus
• High Rx IOL for opto-couplers in isolated designs
• Hot plug circuitry - Tx and Rx outputs remain three-state during power-up/power-down
• Slew rate limited RS-485 data rate: 1Mbps
• Low quiescent supply current: 2.3mA
• Ultra low shutdown supply current: 10µA

Applications

• Utility meters/automated meter reading systems
• High node count RS-485 systems
• PROFIBUS™ and RS-485 based field bus networks and factory automation
• Security camera networks
• Building lighting and environmental control systems
• Industrial/process control networks