描述 Description

The ST485ERB 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 (HBM) ± 8 kV (IEC-1000-4-2 contact discharge) shocks, without latch-up. These parts contain one driver and one receiver.

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.

The driver is a short-circuit current which is limited and protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state.

The ST485ERB is designed for bi-directional data communication on multipoint bus transmission lines (half-duplex applications).

特性 Features

? Low quiescent current: 300 μA
? Designed for RS-485 interface applications
? - 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
? Operates from a single 5 V supply
? Current limiting and thermal shutdown for driver overload protection
? ESD protection:
?± 15 kV (HBM)
?± 8 kV (IEC-1000-4-2 contact discharge)
? Allows up to 64 transceivers on the bus

簡(jiǎn)介

ST485ERB屬于集成電路（IC）的驅(qū)動(dòng)器接收器收發(fā)器。由制造生產(chǎn)的ST485ERB驅(qū)動(dòng)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(guò)延長(zhǎng)電纜或印制線進(jìn)行通信。確切的功能會(huì)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(duì)于通信用途可能并非絕對(duì)必要，但對(duì)于可能的使用環(huán)境卻是明智之選。