ISL32459E: ±60V Fault Protected, 3.3V to 5V, ±20V CMR, 20Mbps RS-485 With Cable Invert, ±15kV ESD

The ISL32450E through ISL32459E 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 and ISL32459E).

The ISL32457E and ISL32459E include a cable invert function that reverses the polarity of the Rx and Tx bus pins in case the cable is misconnected during installation.

Key Differences in Family
ProductsSpeed (Mbps)DuplexSlew Rate LimitedEnable PinsCable InvertLow Power ShutdownPackagesDatasheet
ISL32450E0.25FullYesYesNoYesSOIC-14, MSOP-10isl32450e-52e-53e- 55e-57e-58e-59e.pdf
ISL32452E0.25HalfYesYesNoYesSOIC-8, MSOP-8
ISL32453E1FullYesYesNoYesSOIC-12, MSOP-10
ISL32455E1HalfYesYesNoYesSOIC-8, MSOP-8
ISL32457E0.25HalfYesTx OnlyYesNoSOIC-8, MSOP-8
ISL32458E20HalfNoNoNoYesSOIC-8
ISL32459E20HalfNoTx OnlyYesNoSOIC-8
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 and ISL32459E 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: up to 20Mbps
  • Low quiescent supply current: 2.1mA
Applications
  • Utility meters/automated meter reading systems
  • Air conditioning systems
  • 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
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E DatasheetPDF01 Dec 2015839 KB
Tech Briefs
TitleTypeUpdatedSizeOther Languages
TB505: Understanding the Difference between HBM and IEC 61000-4-2 ESD ImmunityPDF29 Jul 2016121 KB
White Papers
TitleTypeUpdatedSizeOther Languages
Over-Voltage Protection for RS-485 Bus NodesPDF15 Apr 2016457 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL32459EIBZ8 Ld SOIC0.07282260RoHS
ISL32459EIBZ-T8 Ld SOIC T+R0.07282260RoHS
ISL32459EIBZ-T7A8 Ld SOIC T+R0.07282260RoHS
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E Datasheet 01 Dec 2015
ISL32459E 5V IBIS Model 18 Mar 2016
ISL32459E 3.3V IBIS Model 18 Mar 2016
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
Over-Voltage Protection for RS-485 Bus Nodes 15 Apr 2016