© 2005 Fairchild Semiconductor Corporation

DS005106

www.fairchildsemi.com

September 1983

Revised January 2005

MM74HC74A

Dual D-Type Flip-Flop with Preset and Clear

General Description

The MM74HC74A utilizes advanced silicon-gate CMOS

technology to achieve operating speeds similar to the

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

nity and low power consumption of standard CMOS inte-

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

loads.

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-

going transition of the clock pulse. Preset and clear are

independent of the clock and accomplished by a low level

at the appropriate input.

The 74HC logic family is functionally and pinout compatible

with the standard 74LS logic family. All inputs are protected

from damage due to static discharge by internal diode

Features

s Typical propagation delay: 20 ns

s Wide power supply range: 2–6V

s Low quiescent current: 40

µA maximum (74HC Series)

s Low input current: 1

µA maximum

s Fanout of 10 LS-TTL loads

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Pb-Free package per JEDEC J-STD-020B.

Connection Diagram

Pin Assignments for DIP, SOIC, SOP and TSSOP

Truth Table

Note: Q0

= the level of Q before the indicated input conditions were estab-

lished.

Note 1: This configuration is nonstable; that is, it will not persist when pre-

set and clear inputs return to their inactive (HIGH) level.

Order Number

Package

Package Description

Number

MM74HC74AM

M14A

14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

MM74HC74AMX_NL

M14A

Pb-Free 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

MM74HC74ASJ

M14D

Pb-Free 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

MM74HC74AMTC

MTC14

14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

MM74HC74AMTCX_NL

MTC14

Pb-Free 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm

Wide

MM74HC74AN

N14A

14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Inputs

Outputs

PR

CLR

CLK

D

Q

Q

LH

X

X

H

L

HL

X

X

L

H

L

L

X

X

H (Note 1)

H (Note 1)

HH

↑

HH

L

HH

↑

LL

H

HH

L

X

Q0

Q 0