DM54LS279J National Semiconductor, DM54LS279J Datasheet

DM54LS279J

Manufacturer Part Number

DM54LS279J

Description

Quad S-R Latches

Manufacturer

National Semiconductor

Datasheets

1.DM74LS279.pdf (6 pages)

2.DM54LS279J.pdf (6 pages)

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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

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

Low Level

High Level

The Level of Q before the indicated input conditions were established

one or both S inputs low

both S inputs high

DM54LS279J DM74LS279M or DM74LS279N

S(1)

Dual-In-Line Package

Inputs

to be indeterminate Both inputs are voltage level triggered

and are not affected by transition time of the input data

Features

Alternate military aerospace device (54LS279) is avail-

able Contact a National Semiconductor Sales Office

Distributor for specifications

Output

TL F 6420 – 1

RRD-B30M105 Printed in U S A

May 1989

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