DM93L14N FAIRCHILD [Fairchild Semiconductor], DM93L14N Datasheet - Page 2

• Manufacturer Part Number: DM93L14N
• Description: Quad Latch
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

www.fairchildsemi.com
Functional Description
The DM93L14 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
activated overrides all other input conditions forcing all
latch outputs LOW. Each of the four latches can be oper-
ated 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 dis-
ablement. The two modes of latch operation are shown in
the Truth Table.
Logic Diagram
n
and D
n
inputs. the Master Reset when
2
Truth Table
H
L
X
Q
Q
n 1
n
LOW Voltage Level
HIGH Voltage Level
Immaterial
Present Output State
Previous Output State
MR
H
H
H
H
H
H
H
H
L
E
H
H
X
L
L
L
L
L
L
D
H
X
H
H
X
X
L
L
L
S
X
H
H
X
X
L
L
L
L
Q
Q
Q
Q
H
L
L
L
L
L
n-1
n-1
n-1
n
Operation
D Mode
R/S Mode
RESET