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LTC1481 - Ultra-Low Power RS485 Transceiver with Shutdown

The LTC®1481 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.

Features 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 ±7VGround Difference Between Devices on the Data Line Thermal Shutdown Protection Power Up/Down Glitch-Free Driver Outputs PermitLive 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 Typical Application

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