ST485AB数据手册集成电路（IC）的驱动器接收器收发器规格书PDF

描述 Description

The ST485A is a low power, high speed transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration. The ST485A draws 3 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 place the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic high output if both inputs are open circuit.

The ST485A is designed for bi-directional data communications or multipoint bus transmission lines.

特性 Features

• Latch-up free up to 500 mA
• Current limiting and thermal shutdown for driver overload protection
• Operate from single 5 supply
• 70mV typical input hysteresis
• Low supply current: 5 mA max
• Designed for RS 485 interface applications
• High data rate > 30 Mbps
• Driver maintains high impedance in 3-state or with the power off
• ±4 kV ESD protection
• -7 to 12 common mode input voltage range

简介

ST485AB属于集成电路（IC）的驱动器接收器收发器。由制造生产的ST485AB驱动器，接收器，收发器该系列产品的主要功能是提供必需的硬件资源，以通过延长电缆或印制线进行通信。确切的功能会因所采用的通信协议而异，可能包括诸如瞬态抑制之类的功能，这些功能对于通信用途可能并非绝对必要，但对于可能的使用环境却是明智之选。