描述 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).

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).

特性 Features

? Operate from a single 5 V supply
? 30 ns propagation delay, 5 ns skew
? Allows up to 64 transceivers on the bus
? Low quiescent current: 300 μA
? - 7 V to 12 V common mode input voltage range
? Designed for RS-485 interface application
? 70 mV typical input hysteresis
? Current limiting and thermal shutdown for driver overload protection
? Driver maintains high impedance in 3-state or with the power OFF

簡介

ST485B屬于集成電路（IC）的驅動器接收器收發(fā)器。由制造生產(chǎn)的ST485B驅動器，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。