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
to be indeterminate. Both inputs are voltage level triggered
and are not affected by transition time of the input data.
• Alternate military/aerospace device (54LS279) is avail-
able. Contact a National Semiconductor Sales Office/
Distributor for specifications.
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