MC74HCT138A集成電路（IC）的信號(hào)開(kāi)關(guān)多路復(fù)用器解碼器規(guī)格書(shū)PDF中文資料

MC74HCT138A屬于集成電路（IC）的信號(hào)開(kāi)關(guān)多路復(fù)用器解碼器。由安森美半導(dǎo)體公司制造生產(chǎn)的MC74HCT138A信號(hào)開(kāi)關(guān)，多路復(fù)用器，解碼器邏輯型信號(hào)開(kāi)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(wú)窮變化量。

The MC74HCT138A is identical in pinout to the LS138. The HCT138A may be used as a level converter for interfacing TTL or

NMOS outputs to High Speed CMOS inputs. The HCT138A decodes a three?bit Address to one?of?eight active?lot outputs. This device features three Chip Select inputs, two active?low and one active?high to facilitate the demultiplexing, cascading, and chip?selecting functions. The demultiplexing function is accomplished by using the Address inputs to select the desired

device output; one of the Chip Selects is used as a data input while the other Chip Selects are held in their active states.

Features

? Output Drive Capability: 10 LSTTL Loads

? TTL/NMOS Compatible Input Levels

? Outputs Directly Interface to CMOS, NMOS, and TTL

? Operating Voltage Range: 4.5 to 5.5 V

? Low Input Current: 1.0 A

? In Compliance with the Requirements Defined by JEDEC Standard

No. 7A

? Chip Complexity: 122 FETs or 30.5 Equivalent Gates

? Pb?Free Packages are Available*