TL/F/9785
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/9785–1
Order Number 54279DMQB, 54279FMQB or DM74279N
NS Package Number J16A, N16E or W16A
Pin Names Description
R
n
Reset Inputs (Active Low)
S
n
Set Inputs (Active Low)
Q Outputs
Truth Table
Inputs Output
S1S2R Q
LLL h
LXH H
XL
HHL L
H H H No Change
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
h e The output is HIGH as long as S1orS2 is LOW. If all inputs go HIGH
simultaneously, the output state is indeterminate; otherwise, it follows the
Truth Table.
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.