dm74ls279 National Semiconductor Corporation, dm74ls279 Datasheet

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dm74ls279

Manufacturer Part Number
dm74ls279
Description
Quad S-r Latches
Manufacturer
National Semiconductor Corporation
Datasheet

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Part Number:
dm74ls279N
Manufacturer:
NS
Quantity:
3 318
C 1995 National Semiconductor Corporation
54LS279 DM54LS279 DM74LS279
Quad S-R Latches
General Description
The ’LS279 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
Connection Diagram
Function Table
Order Number 54LS279DMQB 54LS279FMQB 54LS279LMQB
H
L
Q
inputs return to their inactive (high) level
Note 1 For latches with double S inputs
TL F 6420
This output level is pseudo stable that is it may not persist when the S and R
See NS Package Number E20A J16A M16A N16E or W16A
0
e
e
e
H
L
Low Level
High Level
The Level of Q before the indicated input conditions were established
e
e
one or both S inputs low
both S inputs high
DM54LS279J DM74LS279M or DM74LS279N
S(1)
H
H
Dual-In-Line Package
L
L
Inputs
R
H
H
L
L
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
Output
H
Q
Q
H
L
0
TL F 6420 – 1
RRD-B30M105 Printed in U S A
May 1989

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dm74ls279 Summary of contents

Page 1

... 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 Connection Diagram Order Number 54LS279DMQB 54LS279FMQB 54LS279LMQB DM54LS279J DM74LS279M or DM74LS279N See NS Package Number E20A J16A M16A N16E or W16A Function Table H e ...

Page 2

... CC Max Max Max Max DM54 DM74 20 b Max (Note DM74LS279 Units Nom Max Typ Max Units (Note ...

Page 3

Switching Characteristics Symbol Parameter t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL High to Low Level Output t Propagation Delay Time PHL High to Low Level Output and T 25 ...

Page 4

Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS279DMQB or DM54LS279J Order Number 54LS279LMQB NS Package Number E20A NS Package Number J16A 4 ...

Page 5

... Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS279M NS Package Number M16A Order Number DM74LS279N NS Package Number N16E 5 ...

Page 6

Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS279FMQB or DM54LS279W LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF ...

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