ISL32452E
±60V Fault Protected, 3.3V to 5V, ±20V Common Mode Range, RS-485/RS-422 Transceivers with Cable Invert and ±15kV ESD
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 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
- Pb-Free (RoHS Compliant)
Description
The ISL32450E through ISL32457E 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 VCC ≥ 4.5V and deliver a 1.1V differential output voltage into the RS-485 specified 54Ω load even with VCC = 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).
The ISL32457E 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.
Applications
- Utility Meters/Automated Meter Reading Systems
- Air Conditioning Systems
- Security Camera Networks
- Building Lighting and Environmental Control Systems
- Industrial/Process Control Networks
