Symbol

Parameter

Units

Min

Max

Propagation Delay

24

ns

24

Propagation Delay

12

ns

24

Propagation Delay

18

ns

Propagation Delay

24

ns

Functional Description

The ’9314 consists of four latches with a common active

LOW Enable input and active LOW Master Reset input

When the Enable goes HIGH data present in the latches is

stored and the state of the latch is no longer affected by the

rides all other input conditions forcing all latch outputs LOW

Each of the four latches can be operated in one of two

modes

D-TYPE LATCHFor D-type operation the S input of a latch

is held LOW While the common Enable is active the latch

output follows the D input Information present at the latch

output is stored in the latch when the Enable goes HIGH

SETRESET LATCHDuring setreset operation when the

common Enable is LOW a latch is reset by a LOW on the D

input and can be set by a LOW on the S input if the D input

is HIGH If both S and D inputs are LOW the D input will

dominate and the latch will be reset When the Enable goes

HIGH the latch remains in the last state prior to disable-

ment The two modes of latch operation are shown in the

Truth Table

Truth Table

MR

E

DS

Operation

H

L

L

L

L

D Mode

HL

H

L

H

HH

X

X

H

L

L

L

L

RS Mode

HL

H

L

H

HL

L

H

L

H

L

HH

X

X

L

X

X

X

L

Reset

3