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Product Descriptions

The LTCe485 is a low power differential bus/ine trans-ceiverdesignedformultipoint data transmission standardRS485 applications with extended common mode range(12V to -7V). lt also meets the requirements of RS422.

The CMOS design offers significant power savings overits bipolar counterpart without sacrificing ruggednessagainst overload or ESD damage.

The driver and receiver feature three-state outputs, withthe driver outputs maintaining high impedance over theentire common mode range.

Excessive power dissipa-tion caused by bus contention or faults is prevented by athermal shutdown circuit which forces the driver outputsinto a high impedance state.

The receiver has a fail-safe feature which guarantees ahigh output state when the inputs are left open.The LTC485 is fully specified over the commercial andextended industrial temperature range.

Products Features

Low Power: lcc = 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 lmpedance in Three-Stateor 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 0peration

Pin Compatible with +60V Protected LTC2862

Specifications

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