74LS279/54LS279 pdf datasheet

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 latches
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 output
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 available.
Contact a National Semiconductor Sales Office/
Distributor for specifications.