描述 Description

High-Performance Silicon-Gate CMOS The MC74HC139A is identical in pinout to the LS139. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs.This device consists of two independent 1-of-4 decoders, each of which decodes a two-bit Address to one-of-four active-low outputs. Active-low Selects are provided to facilitate the demultiplexing and cascading functions. The demultiplexing function is accomplished by using the Address inputs to select the desired device output, and utilizing the Select as a data input.

特性 Features

? Output Drive Capability: 10 LSTTL Loads
? Outputs Directly Interface to CMOS, NMOS and TTL
? Operating Voltage Range: 2.0 to 6.0 V
? Low Input Current: 1.0 mA
? High Noise Immunity Characteristic of CMOS Devices
? In Compliance with the Requirements Defined by JEDEC Standard No. 7A
? Chip Complexity: 100 FETs or 25 Equivalent Gates
? Pb-Free Packages are Available*

簡介

MC74HC139A屬于集成電路（IC）的信號開關多路復用器解碼器。由制造生產的MC74HC139A信號開關，多路復用器，解碼器邏輯型信號開關、多路復用器和編碼器 IC 可用于對以數(shù)字格式表示數(shù)據(jù)的電信號進行路由和選擇。這些器件與設計用于模擬信號的類似產品有所不同，它們保留的信息表示為兩個電狀態(tài)之一，而不是兩個外部界限內的無窮變化量。