ST485CD

低功耗RS - 485 / RS - 422收发器 LOW POWER RS-485/RS-422 TRANSCEIVER

Description

The ST485 is al low power transceiver for RS-485 and RS-422 communication. Each part contains

one driver and one receiver. This transceiver draw 300µA typ. of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5V 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 ST485 is designed for bi-directional data communications on multipoint bus transmission

line half-duplex applciations.

The ST485 is available in three temperature range: commercial 0°C to 70°C, industrial -40°C to 85°C and automotive -55°C to 125°C

General features

■ Low quiescent current: 300µA

■ Designed for RS-485 interface application

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

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

■ 70mV tipycal input hysteresis

■ 30ns propagation delay, 5ns skew

■ Operate from a single 5V supply

■ Current limiting and thermal shutdown for driver overload protection

■ Allows up to 64 transceivers on the bus