54279 DM74279 Quad Set-Reset Latch
June 1989
54279 DM74279 Quad Set-Reset Latch
General Description
This device contains four independent set-reset type flip-
flops with one Q output each
Connection Diagram
Dual-In-Line Package
TL F 9785 鈥?1
Order Number 54279DMQB 54279FMQB or DM74279N
NS Package Number J16A N16E or W16A
Pin Names
R
n
S
n
Q
Description
Reset Inputs (Active Low)
Set Inputs (Active Low)
Outputs
Truth Table
S1
L
L
X
H
H
Inputs
S2
L
X
L
H
H
R
L
H
H
L
H
Output
Q
h
H
H
L
No Change
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
h
e
The output is HIGH as long as S1 or S2 is LOW If all inputs go HIGH
simultaneously the output state is indeterminate otherwise it follows the
Truth Table
C
1995 National Semiconductor Corporation
TL F 9785
RRD-B30M115 Printed in U S A