The ISL32483E and ISL32485E 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 datasheets.
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
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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| ISL32485EIBZ | 8 Ld SOIC | 0.072 | 8 | 2 | 260 | RoHS |
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| ISL32485EIBZ-T | 8 Ld SOIC T+R | 0.072 | 8 | 2 | 260 | RoHS |
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| ISL32485EIBZ-T7A | 8 Ld SOIC T+R | 0.072 | 8 | 2 | 260 | RoHS |
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