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54LS279 Datasheet

  • 54LS279

  • Quad S-R Latches

  • 140.69KB

  • 6頁

  • NSC

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54LS279 DM54LS279 DM74LS279 Quad S-R Latches
May 1989
54LS279 DM54LS279 DM74LS279
Quad S-R Latches
General Description
The 鈥橪S279 consists of four individual and independent Set-
Reset Latches with active low inputs Two of the four latch-
es have an additonal S input ANDed with the primary S
input A low on any S input while the R input is high will be
stored in the latch and appear on the corresponding Q out-
put as a high A low on the R input while the S input is high
will clear the Q output to a low Simultaneous transistion of
the R and S inputs from low to high will cause the Q output
to be indeterminate Both inputs are voltage level triggered
and are not affected by transition time of the input data
Features
Y
Alternate military aerospace device (54LS279) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
TL F 6420 鈥?1
Order Number 54LS279DMQB 54LS279FMQB 54LS279LMQB
DM54LS279J DM74LS279M or DM74LS279N
See NS Package Number E20A J16A M16A N16E or W16A
Function Table
Inputs
S(1)
L
L
H
H
H
e
High Level
L
e
Low Level
Q
0
e
The Level of Q before the indicated input conditions were established
This output level is pseudo stable that is it may not persist when the S and R
inputs return to their inactive (high) level
Note 1
For latches with double S inputs
H
e
both S inputs high
L
e
one or both S inputs low
Output
R
L
H
L
H
Q
H
H
L
Q
0
C
1995 National Semiconductor Corporation
TL F 6420
RRD-B30M105 Printed in U S A

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