MC74LCX257数据手册集成电路（IC）的信号开关多路复用器解码器规格书PDF

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*

简介

MC74LCX257属于集成电路（IC）的信号开关多路复用器解码器。由制造生产的MC74LCX257信号开关，多路复用器，解码器逻辑型信号开关、多路复用器和编码器 IC 可用于对以数字格式表示数据的电信号进行路由和选择。这些器件与设计用于模拟信号的类似产品有所不同，它们保留的信息表示为两个电状态之一，而不是两个外部界限内的无穷变化量。