ISL32277E: QUAD, ±16.5kV ESD Protected, 3.0V to 5.5V, RS-485/RS-422 Receivers

These Intersil devices are ±16.5kV IEC61000-4-2 ESD protected, 3.0V to 5.5V powered, quad receivers for balanced communication using the RS-485 and RS-422 standards. Each receiver has low input currents (±200µA), so it presents a 1/4 unit load to the RS-485 bus and allows up to 128 receivers on the bus.

The ISL32173E, ISL32175E, ISL32177E are high data rate receivers that operate at data rates up to 80Mbps. Their 8ns maximum propagation delay skew (tolerance) guarantees excellent part-to-part matching. The ISL32273E, ISL32275E, ISL32277E are reduced supply current versions that operate at data rates up to 20Mbps.

Receiver outputs are tri-statable and incorporate a hot plug feature to keep them disabled during power-up and power-down. Versions are available with a common EN/EN (ISL32173E pinout), a two channel EN12/EN34 (ISL32175E pinout), or a vers atile individual channel enable (see Table 1).

A 26% smaller footprint is available with the ISL32177E and ISL32277E QFN packages and these two devices also feature a logic supply pin (VL). The VL supply sets the switching points of the enable inputs and the receiver outputs’ VOH, to levels compatible with a lower supply voltage in mixed voltage systems. Individual channel and group enable pins increase the ISL32177E and ISL32277E’s flexibility.

Key Features
  • IEC61000 ESD protection (RS-485 inputs): ±16.5kV
    • Class 3 ESD on all other pins: >8kV HBM
  • Wide supply range: 3.0V to 5.5V
  • Wide common-mode range: -7V to +12V
  • Low part-to-part propagation delay tolerance (ISL3217XE): 8ns (max)
  • Specified for +125°C operation
  • Fail-safe open Rx inputs
  • 1/4 unit load allows 128 devices on the bus
  • Available in industry standard pinouts (ISL32173E/ ISL32175E ) and a 4x4 QFN (ISL32X77E) with added features
  • Logic supply pin (VL) eases operation in mixed supply systems (ISL32X77E)
  • High data rates: up to 80Mbps or 20Mbps
  • Low shutdown supply current: 60µA
  • Tri-statable Rx outputs
  • 5V tolerant logic inputs when VCC = 3.3V
Applications
  • Telecom equipment
  • Motor controllers/encoders
  • Programmable logic controllers
  • 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
ISL32173E, ISL32273E, ISL32175E, ISL32275E, ISL32177E, ISL32277E DatasheetPDF25 Apr 20161021 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
ISL32277EFRZ24 Ld QFN0.044243260RoHS
ISL32277EFRZ-T24 Ld QFN T+R0.044243260RoHS
ISL32277EIRZ24 Ld QFN0.044243260RoHS
ISL32277EIRZ-T24 Ld QFN T+R0.044243260RoHS
ISL32173E, ISL32273E, ISL32175E, ISL32275E, ISL32177E, ISL32277E Datasheet 25 Apr 2016
24 Ld QFN T+R ISL6567
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