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LTC1484 - Low Power RS485 Transceiver with Receiver Fail-Safe

The LTC®1484 is a low power RS485 compatible transceiver. In receiver mode, it offers a fail-safe feature which guarantees a high receiver output state when the inputs are left open, shorted together or terminated with no signal present. No external components are required to ensure the high receiver output state. Both driver and receiver feature three-state outputs with separate receiver and driver control pins. The driver outputs maintain high impedance over the entire common mode range when three-stated. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit that forces the driver outputs into a high impedance state. Enhanced ESD protection allows the LTC1484 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 LTC1484 is fully specified over the commercial and industrial temperature ranges and is available in 8-lead MSOP, PDIP and SO packages.

Features No Damage or Latchup to ±15kV ESD (Human Body Model), IEC-1000-4-2 Level 4 Contact (±8kV) and Level 3 (±8kV) Air Gap Specifications 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 for Driver Enable with No 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 Power Up/Down Glitch-Free Driver Outputs Up to 32 Transceivers on the Bus Pin Compatible with the LTC485 Available in 8-Lead MSOP, PDIP and SO Packages Typical Application

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