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The ISL32450E through ISL32459E are 3.3V to 5V powered, fault protected, extended common-mode range differential transceivers for balanced communication. The RS-485 bus pins (driver outputs and receiver inputs) are protected against overvoltages up to ±60V, and against ±15kV ESD strikes. These transceivers operate in environments with common-mode voltages up to ±20V (exceeds the RS-485 requirement), making this RS-485 family one of the more robust on the market.

Transmitters are RS-485 compliant with V_CC ≥ 4.5V and deliver a 1.1V differential output voltage into the RS-485 specified 54Ω load even with V_CC = 3V. 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. Rx full fail-safe operation is maintained even when the Rx input polarity is switched (cable invert function on ISL32457E and ISL32459E).

The ISL32457E and ISL32459E include a cable invert function that reverses the polarity of the Rx and Tx bus pins in case the cable is misconnected during installation.

Key Features

• Fault protected RS-485 bus pins: up to ±60V
• Extended common-mode range: ±20V larger than required for RS-485
• ±15kV HBM ESD protection on RS-485 bus pins
• Wide supply range: 3V to 5.5V
• Cable invert pin (ISL32457E and ISL32459E only) corrects for reversed cable connections while maintaining Rx full fail-safe functionality
• 1/4 unit load for up to 128 devices on the bus
• High transient overvoltage tolerance: ±80V
• Full fail-safe (open, short, terminated) RS-485 receivers
• Choice of RS-485 data rates: up to 20Mbps
• Low quiescent supply current: 2.1mA

Applications

• Utility meters/automated meter reading systems
• Air conditioning systems
• Security camera networks
• Building lighting and environmental control systems
• Industrial/process control networks