DM9314N NSC [National Semiconductor], DM9314N Datasheet - Page 3

• Manufacturer Part Number: DM9314N
• Description: Quad Latch
• Manufacturer: NSC [National Semiconductor]

Switching Characteristics
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
S
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 LATCH For 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
SET RESET LATCH During set reset 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
n
and D
Symbol
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
n
inputs The Master Reset when activated over-
Propagation Delay
E to Q
Propagation Delay
D
Propagation Delay
MR to Q
Propagation Delay
S
n
n
to Q
to Q
Parameter
n
n
n
n
V
CC
e a
5 0V T
A
3
e a
Truth Table
H
L
X
Q
Q
25 C (See Section 1 for waveforms and load configurations)
n
n
e
e
e
b
Min
MR
e
1
H
H
H
H
H
H
H
H
L
LOW Voltage Level
Immaterial
HIGH Voltage Level
e
Present Output State
Previous Output State
C
L
E
H
H
X
L
L
L
L
L
L
e
15 pF
D
H
X
H
H
X
X
L
L
L
Max
24
24
12
24
18
24
S
X
H
H
X
X
L
L
L
L
Q
Q
Q
Q
n
n
n
H
H
L
L
L
L
b
b
b
n
1
1
1
D Mode
R S Mode
Reset
Operation
Units
ns
ns
ns
ns