ISL83070E: ±15kV HBM ESD, 3.3V, Full-duplex, 250kbps RS-485/RS-422 Transceiver with Tx/Rx enable

The Intersil ISL8307XE are BiCMOS 3.3V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. These devices have very low bus currents (+125mA/-100mA), so they present a true “1/8 unit load” to the RS-485 bus. This allows up to 256 transceivers on the network without violating the RS-485 specification’s 32 unit load maximum, and without using repeaters. For example, in a remote utility meter reading system, individual meter readings are routed to a concentrator via an RS-485 network, so the high allowed node count minimizes the number of repeaters required.

Receiver (Rx) inputs feature a “Full Fail-Safe” design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or terminated but undriven.

Hot Plug circuitry ensures that the Tx and Rx outputs remain in a high impedance state while the power supply stabilizes.

The ISL83070E through ISL83075E utilize slew rate limited drivers which reduce EMI, and minimize reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications. Slew rate limited versions also include receiver input filtering to enhance noise immunity in the presence of slow input signals.

The ISL83070E, ISL83071E, ISL83073E, ISL83076E, ISL83077E are configured for full duplex (separate Rx input and Tx output pins) applications. The half duplex versions multiplex the Rx inputs and Tx outputs to allow transceivers with output disable functions in 8 lead packages.

Key Features
  • Pb-Free (RoHS Compliant)
  • RS-485 I/O Pin ESD Protection: ±15kV HBM
    • Class 3 ESD Level on all Other Pins: >7kV HBM
  • Full Fail-safe (Open, Short, Terminated/Floating) Receivers
  • Hot Plug - Tx and Rx Outputs Remain Three-state During Power-up (Only Versions with Output Enable Pins)
  • True 1/8 Unit Load Allows up to 256 Devices on the Bus
  • Single 3.3V Supply
  • High Data Rates: up to 20Mbps
  • Low Quiescent Supply Current: 800μA (Max)
    • Ultra Low Shutdown Supply Current: 10nA
  • -7V to +12V Common Mode Input/Output Voltage Range
  • Half and Full Duplex Pinouts
  • Three State Rx and Tx Outputs Available
  • Current Limiting and Thermal Shutdown for driver Overload Protection
  • Tiny MSOP package offering saves 50% board space
Applications
  • Automated Utility Meter Reading Systems
  • High Node Count Systems
  • Field Bus Networks
  • Security Camera Networks
  • Building Environmental Control/Lighting 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
AN1593: Add a Loss of Signal (LOS) Indicator to Your RS-485 or RS-422 TransceiverPDF12 May 2015386 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL8307xE DatasheetPDF18 Dec 2014762 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
ISL83070EIBZA14 Ld SOIC0.131143260RoHS
ISL83070EIBZA-T14 Ld SOIC T+R0.131143260RoHS
ISL8307xE Datasheet 18 Dec 2014
14 Ld SOIC HI-303
ISL83070E IBIS Model 12 Nov 2014
ISL83072E
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
AN1593: Add a Loss of Signal (LOS) Indicator to Your RS-485 or RS-422 Transceiver 12 May 2015
TB505: Understanding the Difference between HBM and IEC 61000-4-2 ESD Immunity 29 Jul 2016