描述 Description

The MC74LCX257 is a high performance, quad 2-input multiplexer with 3-state outputs operating from a 2.3 to 3.6V supply. High impedanceTTL compatible inputs significantly reduce current loading to input drivers while TTL compatible outputs offer improved switching noise performance. A VI specification of 5.5V allows MC74LCX257 inputs to be safely driven from 5.0V devices.Four bits of data from two sources can be selected using the Select input. The four outputs present the selected data in the true(non-inverted) form. The outputs may be switched to a high impedance state by placing a logic HIGH on the Output Enable (OEbar) input. Current drive capability is 24mA at the outputs.

特性 Features

? Designed for 2.3 to 3.6V VCC Operation
? 5V Tolerant - Interface Capability With 5V TTL Logic
? Supports Live Insertion and Withdrawal
? IOFF Specification Guarantees High Impedance When VCC = 0V
? LVTTL Compatible
? LVCMOS Compatible
? 24mA Balanced Output Sink and Source Capability
? Near Zero Static Supply Current in All Three Logic States (10mA) Substantially Reduces System Power Requirements
? Latchup Performance Exceeds 500mA
? ESD Performance:Human Body Model >2000V; Machine Model >200V
? Pb-Free Packages are Available*

簡(jiǎn)介

MC74LCX257屬于集成電路（IC）的信號(hào)開關(guān)多路復(fù)用器解碼器。由制造生產(chǎn)的MC74LCX257信號(hào)開關(guān)，多路復(fù)用器，解碼器邏輯型信號(hào)開關(guān)、多路復(fù)用器和編碼器 IC 可用于對(duì)以數(shù)字格式表示數(shù)據(jù)的電信號(hào)進(jìn)行路由和選擇。這些器件與設(shè)計(jì)用于模擬信號(hào)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。