LTC485

PRODUCTION

Low Power RS485 Interface Transceiver

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Overview

  • Low Power: ICC = 300μA Typ
  • Designed for RS485 Interface Applications
  • Single 5V Supply
  • –7V to 12V Bus Common Mode Range Permits ±7V Ground Difference Between Devices on the Bus
  • 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
  • Combined Impedance of a Driver Output and Receiver Allows Up to 32 Transceivers on the Bus
  • 70mV Typical Input Hysteresis
  • 30ns Typical Driver Propagation Delays with 5ns Skew for Up to 2.5MB Operation
  • Pin Compatible with ±60V Protected LTC2862

The LTC485 is a low power differential bus/line transceiver designed for multipoint data transmission standard RS485 applications with extended common mode range (12V to –7V). It also meets the requirements of RS422.

The CMOS design offers significant power savings over its bipolar counterpart without sacrificing ruggedness against overload or ESD damage.

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 LTC485 is fully specified over the commercial and extended industrial temperature range.

Applications

  • Low Power RS485/RS422 Transceiver
  • Level Translator
LTC485
Low Power RS485 Interface Transceiver
Driver Outputs Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Interface Transceivers & Isolators 2
LTM2881
PRODUCTION Complete Isolated RS485/RS422 μModule Transceiver + Power
LTC2862
PRODUCTION ±60V Fault Protected 3V to 5.5V RS485/RS422 Transceivers
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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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