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The ISL32483E and ISL32485E 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 and are protected against ±16.5kV ESD strikes without latch-up. 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 (Tx) 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 ISL32483E and ISL32485E 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.

For fault protected RS-485 transceivers without the cable invert function, please see the ISL32470E and ISL32490E datasheets.

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
• ±16.5kV HBM ESD protection on RS-485 bus pins
• 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