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LTC1482 Low Power RS485 Transceiver with Carrier Detect and Receiver Fail-Safe

09/28/2022

Product Details

The LTC1482 is a low power RS485 compatible transceiver that offers an active low carrier detect output. The open-drain carrier detect pin allows several transceivers to share the same carrier detect line and can be used to detect the insertion or removal of a driven RS485/RS422 cable.

Enhanced ESD protection allows the LTC1482 to withstand ±15kV (human body model), IEC-1000-4-2 level 4 (±8kV) contact and level 3 (±8kV) air discharge ESD without latchup or damage.

The LTC1482 receiver stays alive at all times except in shutdown. The supply current is a maximum of 700µA and 900µA when the driver is disabled and enabled respectively. In shutdown, the quiescent current of the LTC1482 drops to a maximum of 20µA.

When the driver is disabled or the LTC1482 is in shutdown, the driver outputs are three-stated and remain in a high impedance state over the RS485 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 LTC1482 is fully specified over the commercial and industrial temperature ranges and is available in 8-lead MSOP, PDIP and SO packages.

Applications

  • Battery-Powered RS485/RS422 Applications
  • Low Power RS485/RS422 Transceiver
  • Level Translator

Features and Benefits

  • No Damage or Latchup to ±15kV (Human Body Model), IEC1000-4-2 Level 4 (±8kV) Contact and Level 3 (±8kV) Air Discharge
  • Active Low Carrier Detect Output
  • Guaranteed High Receiver Output State for Floating, Shorted or Terminated Inputs with No Signal Present
  • Drives Low Cost Residential Telephone Wires
  • Low Power: ICC = 700µA Max with Driver Disabled
  • ICC = 900µA Max in Driver Mode Without Load
  • 20µA Max Quiescent Current in Shutdown Mode
  • Single 5V Supply
  • –7V to 12V Common Mode Range Permits ±7V Ground Difference Between Devices on the Data Line
  • Maximum Data Rate of 4Mbps
  • Power Up/Down Glitch-Free Driver Outputs
  • Up to 32 Transceivers on the Bus
  • Available in 8-Lead MSOP, PDIP and SO Packages