The ISL31483E and ISL31485E 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. 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 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 ISL31483E and ISL31485E 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.
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
- 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
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
Order Information| Part Number | Package Type | Weight(g) | Pins | MSL Rating | Peak Temp (°C) | RoHS Status |
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| ISL31485EIBZ | 8 Ld SOIC | 0.072 | 8 | 2 | 260 | RoHS |
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| ISL31485EIBZ-T | 8 Ld SOIC T+R | 0.072 | 8 | 2 | 260 | RoHS |
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| ISL31485EIBZ-T7A | 8 Ld SOIC T+R | 0.072 | 8 | 2 | 260 | RoHS |
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