ISL32485E
Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert and ±16.5kV ESD
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
Description
The ISL3248xE 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 data sheets.
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
