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Description

The ST75C176B/C is al low power transceiver for RS-485 and RS-422 communication. Each part contains one driver and one receiver.

This transceiver draw 300 mA (typ.) of supply current when unloaded or fully loaded with disabled drivers.

It operates from a single 5 V supply.

Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that placed the driver outputs into a high-impedance state. The receiver input has a fail safe feature that guarantees a logic-high output if the input is open circuit.

The ST75C176B/C is designed for bidirectional data communications on multipoint bus transmission line (half-duplex applications).

Features

■ Low quiescent current: 300 mA

■ Designed for RS-485 interface applications

■ -7 V to 12 V common mode input voltage range

■ Driver maintains high impedance in 3-state or with the power OFF

■ 70 mV typical input hysteresis

■ 30 ns propagation delays, 5 ns skew

■ Operate from a single 5 V supply

■ Current limiting and thermal shutdown for driver overload protection

■ Allows up to 32 transceivers on the bus

■ BiCMOS technology