LTC1481

PRODUCTION

Ultra-Low Power RS485 Transceiver with Shutdown

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Overview

  • Low Power: ICC = 120µA Max with Driver Disabled
  • Drivers/Receivers Have ±10kV ESD Protection
  • 1µA Quiescent Current in Shutdown Mode
  • High Speed: Up to 2.5Mbits/s Data Rate
  • ICC = 500µA Max with Driver Enabled, No Load
  • Single 5V Supply
  • -7V to 12V Common-Mode Range Permits ±7V Ground Difference Between Devices on the Data Line
  • Thermal Shutdown Protection
  • Power Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Transceiver
  • Driver Maintains High Impedance in Three-State or with the Power Off
  • Up to 32 Transceivers on the Bus
  • 30ns Typical Driver Propagation Delays with 5ns Skew
  • Pin Compatible with the LTC485

The LTC1481 is an ultralow power differential line transceiver designed for data transmission standard RS485 applications. It will also meet the requirements of RS422. The CMOS design offers significant power savings over its bipolar counterparts without sacrificing ruggedness against overload or ESD damage. Typical quiescent current is only 80µA while operating and less than 1µA in shutdown.

The driver and receiver feature three-state outputs, with the driver outputs maintaining high impedance over the entire common mode range. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state. The receiver has a fail-safe feature which guarantees a high output state when the inputs are left open.

The LTC1481 is fully specified over the commercial and extended industrial temperature range and is available in 8-pin PDIP and SO packages.

Applications

  • Battery-Powered RS485/RS422 Applications
  • Low Power RS485/RS422 Transceiver
  • Level Translator
LTC1481
Ultra-Low Power RS485 Transceiver with Shutdown
Supply Current vs Temperature Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Data Sheet

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Hardware Ecosystem

Parts Product Life Cycle Description
Interface Transceivers & Isolators 1
LTM2881
PRODUCTION Complete Isolated RS485/RS422 μModule Transceiver + Power
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Evaluation Kits

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EVAL-RS485HDEBZ

Standard RS-485 Half-Duplex Evaluation Board, EVAL-RS485HDEBZ

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Product Details

The EVAL-RS485HDEBZ allows quick and easy evaluation of half-duplex RS-485 transceivers with standard 8-lead SOIC footprints. The evaluation board allows interfacing via screw terminal block to digital I/O for driver input (DI), receiver output (RO), driver enable (DE) and receiver output (RO). Bus signals A and B (half-duplex bus) can be connected to a bus screw terminal block. One or two termination resistors can be connected to A and B via jumper settings, in order to evaluation the half-duplex RS-485 driver and receiver. Footprints are provided for pull-up and pull-down (biasing resistors) on the bus.

Devices for evaluation on the board must be ordered separately.
EVAL-RS485HDEBZ
Standard RS-485 Half-Duplex Evaluation Board, EVAL-RS485HDEBZ
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