ISL32475EIBZ-T

The ISL32475E is fault-protected, extended common mode range differential transceivers that exceed the RS-485 and RS-422 standards for balanced communication. The RS-485 bus pins (driver outputs and receiver inputs) are fault protected against overvoltages up to ±60V and are protected against ±16.5kV ESD strikes without latch-up. Additionally, these transceivers operate in environments with common mode voltages up to ±15V (exceeds the RS-485 requirement), making this fault-protected RS-485 family one of the more robust on the market. Transmitters (Tx) deliver an exceptional 2.5V (typical) differential output voltage into the RS-485 specified 54? load. This yields better noise immunity than standard RS-485 ICs or allows up to six 120? terminations in star 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. Rx outputs feature high drive levels; typically, 15mA @ VOL = 1V (to ease the design of opto-coupled isolated interfaces). Half duplex (Rx inputs and Tx outputs multiplexed together) and full duplex pinouts are available. See Table 1 on page 2 for key features and configurations by device number.

• 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 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 250kbps or 1Mbps
• Low Quiescent Supply Current 2.1mA Ultra Low Shutdown Supply Current 10µA