HD74LVC74

2

Function Table

Inputs

Outputs

PR

CLR

CK

D

Q

Q

L

H

XXH

L

H

L

XXL

H

L

L

XXH

*1

H

*1

HH

↑

HH

L

HH

↑

LL

H

HH

L

X

Q

0

Q

0

HH

HX

Q

0

Q

0

HH

↓

XQ

0

Q

0

H :

High level

L :

Low level

X :

Immaterial

↓ :

High to Low transition

↑ :

Low to high transition

Q

Level to Q before the indicated steady input conditions were established.

Note:

1. Q and

Q will remain high as long as preset and clear are low, but Q and Q are unpredictable, if

preset and clear go high simultaneously.

Pin Arrangement

(Top view)

11

12

13

2CLR

2D

2CK

2PR

2Q

1

2

3

4

5

6

7

8

9

10

1CLR

GND

1D

1CK

1PR

1Q

1Q

2Q

D

CK

PR CLR

Q

Q

D

CK

CLR

PR

Q

Q