LTC490

PRODUCTION

Differential Driver and Receiver Pair

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Overview

  • Low Power: ICC = 300µA Typical
  • Designed for RS485 or RS422 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 Package
  • Driver Maintains High Impedance with the Power Off
  • Combined Impedance of a Driver Output and Receiver Allows up to 32 Transceivers on the Bus
  • 70mV Typical Input Hysteresis
  • 28ns Typical Driver Propagation Delays with 5ns Skew for 2.5MB Operation
  • Pin Compatible with the SN75179
  • Available in 8-Lead PDIP and SO Packages

The LTC490 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.

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.

Both AC and DC specifications are guaranteed from 0°C to 70°C and 4.75V to 5.25V supply voltage range.

Applications

  • Low Power RS485/RS422 Transceiver
  • Level Translator
LTC490
Differential Driver and Receiver Pair
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Documentation

Data Sheet 1

Reliability Data 1

Data Sheet

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Hardware Ecosystem

Parts Product Life Cycle Description
Interface Transceivers 2
LTM2881
PRODUCTION Complete Isolated RS485/RS422 μModule Transceiver + Power
LTC2863
PRODUCTION ±60V Fault Protected 3V to 5.5V RS485/RS422 Transceivers
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Evaluation Kits

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EVAL-RS485FD8EBZ

Standard RS-485 Full-Duplex (8-lead SOIC) Evaluation Board, EVAL-RS485FD8EBZ

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Product Details

The EVAL-RS485FD8EBZ allows quick and easy evaluation of full-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) and receiver output (RO). Bus signals A, B, Y and Z (full-duplex bus) can be connected to a bus screw terminal block. Termination resistors are fitted across A and B, as well as Y and Z. These can be connected in half-duplex configuration (A to Y, B to Z), in order to evaluate the RS-485 driver. Footprints are provided for pull-up and pull-down (biasing resistors) on the receiver inputs in order to provide the option to evaluate an RS-485 receiver with this configuration.

Devices for evaluation on the board must be ordered separately.
EVAL-RS485FD8EBZ
Standard RS-485 Full-Duplex (8-lead SOIC) Evaluation Board, EVAL-RS485FD8EBZ
Eval-RS485FD8EBZ

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