MM74HC74A

更新时间： 2024-11-16 05:08:31

品牌	Logo	应用领域
美国国家半导体 - NSC		触发器
页数	文件大小	规格书
4页	114K
描述
Dual D Flip-Flop with Preset and Clear

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数据手册

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MM74HC74A 数据手册

January 1988

MM54HC74A/MM74HC74A

Dual D Flip-Flop with Preset and Clear

General Description

The MM54HC74A/MM74HC74A utilizes advanced silicon-

gate CMOS technology to achieve operating speeds similar

to the equivalent LS-TTL part. It possesses the high noise

immunity and low power consumption of standard CMOS

integrated circuits, along with the ability to drive 10 LS-TTL

loads.

The 54HC/74HC logic family is functionally and pinout com-

patible with the standard 54LS/74LS logic family. All inputs

are protected from damage due to static discharge by inter-

nal diode clamps to V

and ground.

Features

This flip-flop has independent data, preset, clear, and clock

inputs and Q and Q outputs. The logic level present at the

data input is transferred to the output during the positive-go-

ing transition of the clock pulse. Preset and clear are inde-

pendent of the clock and accomplished by a low level at the

appropriate input.

Typical propagation delay: 20 ns

Wide power supply range: 2–6V

Low quiescent current: 40 mA maximum (74HC Series)

Low input current: 1 mA maximum

Fanout of 10 LS-TTL loads

Connection and Logic Diagrams

Truth Table

Dual-In-Line Package

Inputs

Outputs

CLR

CLK

Note: Q0 the level of Q before the indicated input condi-

tions were established.

* This configuration is nonstable; that is, it will not persist

when preset and clear inputs return to their inactive (high)

level.

TL/F/5106–1

Order Number MM54HC74A or MM74HC74A

TL/F/5106–2

1995 National Semiconductor Corporation

TL/F/5106

RRD-B30M105/Printed in U. S. A.

12 3 4

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