描述 Description

The ST485E is a low power transceiver for RS-485 and RS-422 communication. Each driver output and receiver input is protected against ±15 kV electrostatic discharge (H.B.M.) (ESD) shocks, without latch-up. These parts contain one driver and one receiver in half duplex configuration.

This transceiver draws 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 place the driver outputs into a high-impedance state.

The ST485E is designed for bi-directional data communications on multipoint bus transmission lines (half-duplex applications).

特性 Features

? Allows up to 256 transceivers on the bus
? ESD protection: ±15 kV (H.B.M.) ±8 kV (IEC-1000-4-2 contact discharge)
? Operates from a single 5 V supply
? 30 ns propagation delay, 5 ns skew
? 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

ST485EX屬于集成電路（IC）的驅動器接收器收發(fā)器。由制造生產的ST485EX驅動器，接收器，收發(fā)器該系列產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。