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The ISL32430E through ISL32437E 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 ±40V, and against ±15kV ESD strikes. Additionally, these transceivers operate in environments with common mode voltages up to ±15V (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 ISL32437E).

The ISL32437E includes a cable invert function that reverses the polarity of the Rx and Tx bus pins in case the cable is misconnected during installation.

See Table 1 on page 2 for key features and configurations by device number.

Key Features

• Fault Protected RS-485 Bus Pins: up to ±40V
• Extended Common Mode Range: ±15V 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 (ISL32437E 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: ±60V
• Full Fail-safe (Open, Short, Terminated) RS-485 Receivers
• Choice of RS-485 Data Rates: 250kbps or 1Mbps
• Low Quiescent Supply Current: 2.1mA Ultra Low Shutdown Supply Current: 10µA
• Pb-Free (RoHS Compliant)

Applications

• Utility Meters/Automated Meter Reading Systems
• Air Conditioning Systems
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks