ST485B集成電路（IC）的驅(qū)動器接收器收發(fā)器規(guī)格書PDF中文資料

ST485B屬于集成電路（IC）的驅(qū)動器接收器收發(fā)器。由意法半導(dǎo)體集團制造生產(chǎn)的ST485B驅(qū)動器，接收器，收發(fā)器該系列產(chǎn)品的主要功能是提供必需的硬件資源，以通過延長電纜或印制線進行通信。確切的功能會因所采用的通信協(xié)議而異，可能包括諸如瞬態(tài)抑制之類的功能，這些功能對于通信用途可能并非絕對必要，但對于可能的使用環(huán)境卻是明智之選。

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 300 μA (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 ST485 is designed for bi-directional data communications on multipoint bus transmission

line (half-duplex applications).

Features

■ Low quiescent current: 300 μA

■ Designed for RS-485 interface application

■ -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 delay, 5 ns skew

■ Operate from a single 5 V supply

■ Current limiting and thermal shutdown for driver overload protection

■ Allows up to 64 transceivers on the bus