74LS279

54LS279 DM54LS279 DM74LS279 Quad S-R Latches May 1989 54LS279 DM54LS279 DM74LS279 Quad S-R Latches General Description The ’LS279 consists of four individual and independent SetReset 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 Connection Diagram Dual-In-Line Package TL F 6420 – 1 Order Number 54LS279DMQB 54LS279FMQB 54LS279LMQB DM54LS279J DM74LS279M or DM74LS279N See NS Package Number E20A J16A M16A N16E or W16A Function Table Inputs Output S(1) R Q L L H L H H H L L H H Q0 H e High Level L e Low Level Q0 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 C1995 National Semiconductor Corporation TL F 6...