ISL31483E: Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert

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
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN1979: Surge Protection simplified with Intersil’s Overvoltage Protected (OVP) TransceiversPDF24 Aug 2016250 KB
AN1978: Surge Protection for Intersil’s Standard RS-485 TransceiversPDF18 Aug 2016199 KB
AN1976: Important Transient Immunity Tests for RS-485 NetworksPDF10 Aug 2016156 KB
AN1977: Transient Voltage Suppressors: Operation and FeaturesPDF09 Aug 2016198 KB
AN1980: Ground Potential Differences: Origin and RemediesPDF29 Jul 2016198 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL31483E, ISL31485E DatasheetPDF13 May 2015684 KB
Tech Briefs
TitleTypeUpdatedSizeOther Languages
TB505: Understanding the Difference between HBM and IEC 61000-4-2 ESD ImmunityPDF29 Jul 2016121 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL31483EIBZ14 Ld SOIC0.13142260RoHS
ISL31483EIBZ-T14 Ld SOIC T+R0.13142260RoHS
ISL31483EIBZ-T7A14 Ld SOIC T+R0.13142260RoHS
ISL31483E, ISL31485E Datasheet 13 May 2015
14 Ld SOIC HI-303
ISL31483E IBIS Model 06 Nov 2014
ISL31485E
AN1979: Surge Protection simplified with Intersil’s Overvoltage Protected (OVP) Transceivers 24 Aug 2016
AN1978: Surge Protection for Intersil’s Standard RS-485 Transceivers 18 Aug 2016
AN1976: Important Transient Immunity Tests for RS-485 Networks 10 Aug 2016
AN1977: Transient Voltage Suppressors: Operation and Features 09 Aug 2016
AN1980: Ground Potential Differences: Origin and Remedies 29 Jul 2016
TB505: Understanding the Difference between HBM and IEC 61000-4-2 ESD Immunity 29 Jul 2016