描述 Description

The MC74AC257/74ACT257 is a quad 2-input multiplexer with 3-state outputs.Four bits of data from two sources can be selected using a Common Data Selectinput. The four outputs present the selected data in true (noninverted) form. Theoutputs may be switched to a high impedance state by placing a logic HIGH onthe common Output Enable (OE) input, allowing the outputs to interface directlywith bus-oriented systems.

特性 Features

? Multiplexer Expansion by Tying Outputs Together
? Noninverting 3-State Outputs
? Outputs Source/Sink 24 mA
? ACT257 Has TTL Compatible Inputs
? These devices are available in Pb-free package(s). Specifications herein apply to both standard and Pb-free devices. Please see our website at www.onsemi.com for specific Pb-free orderable part numbers, or contact your local ON Semiconductor sales office or representative.

簡介

MC74ACT257屬于集成電路（IC）的信號開關(guān)多路復(fù)用器解碼器。由制造生產(chǎn)的MC74ACT257信號開關(guān)，多路復(fù)用器，解碼器邏輯型信號開關(guān)、多路復(fù)用器和編碼器 IC 可用于對以數(shù)字格式表示數(shù)據(jù)的電信號進(jìn)行路由和選擇。這些器件與設(shè)計(jì)用于模擬信號的類似產(chǎn)品有所不同，它們保留的信息表示為兩個(gè)電狀態(tài)之一，而不是兩個(gè)外部界限內(nèi)的無窮變化量。