Rev.3.00, Jul.22.2005, page 1 of 4

HD74LS77

4-bit Bistable Latches

REJ03D0418–0300

Rev.3.00

Jul.22.2005

The HD74LS77 is ideally suited for use as temporary storage for binary information between processing units and

input / output or indicator units. Information present at a data (D) input is transferred to the Q output when the enable

(G) is high and the Q output will follow the data input as long as the enable remains high. When the enable goes low,

the information (that was present at the data input at the time the transition occurred) is retained at the Q output until the

enable is permitted to go high.

Features

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74LS77FPEL

SOP-14 pin (JEITA)

PRSP0014DF-B

(FP-14DAV)

FP

EL (2,000 pcs/reel)

Pin Arrangement

(Top view)

1Q

2Q

Enable 1-2

GND

3Q

NC

1D

NC

2D

Enable 3-4

3D

4D

4Q

1

2

3

4

5

6

7

14

8

9

10

11

12

13

Q

Q

G

D

G

D

Q

G

D

Q

G

D

Function Table

Inputs

Outputs

D

G

Q

L

H

L

H

H

H

X

L

H; high level, L; low level, X; irrelevant