54F138DM

更新时间： 2024-02-23 18:55:10

品牌	Logo	应用领域
美国国家半导体 - NSC		解码器驱动器解复用器逻辑集成电路输入元件
页数	文件大小	规格书
10页	177K
描述
1-of-8 Decoder/Demultiplexer

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技术参数
数据手册

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54F138DM 技术参数

生命周期：	Active	包装说明：	,
Reach Compliance Code：	compliant	风险等级：	5.75
Is Samacsys：	N	Base Number Matches：	1

54F138DM 数据手册

Unit Loading/Fan Out

54F/74F

Pin Names

Description

U.L.

Input I /I

IH IL

Output I /I

HIGH/LOW

OH OL

20 mA/ 0.6 mA

A –A

Address Inputs

1.0/1.0

50/33.3

E , E

Enable Inputs (Active LOW)

Enable Input (Active HIGH)

Outputs (Active LOW)

O –O

1 mA/20 mA

Functional Description

The ’F138 high-speed 1-of-8 decoder/demultiplexer ac-

of the device to a 1-of-32 (5 lines to 32 lines) decoder with

just four ’F138 devices and one inverter (See Figure 1 ). The

’F138 can be used as an 8-output demultiplexer by using

one of the active LOW Enable inputs as the data input and

the other Enable inputs as strobes. The Enable inputs which

are not used must be permanently tied to their appropriate

active HIGH or active LOW state.

cepts three binary weighted inputs (A A ) and, when

0, 1,

enabled, provides eight mutually exclusive active LOW out-

puts (O –O ). The ’F138 features three Enable inputs, two

active LOW (E E ) and one active HIGH (E ). All outputs

will be HIGH unless E and E are LOW and E is HIGH.

This multiple enable function allows easy parallel expansion

Truth Table

Inputs

Outputs

HIGH Voltage Level

LOW Voltage Level

Immaterial

123 4 5 6 7...10

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