Part # 74LS279 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: 54LS279 DM54LS279 DM74LS279 Quad - Latches

Part Details:

54LS279DM54LS279DM74LS279 May 1989 54LS279 DM54LS279 DM74LS279Quad S-R Latches General DescriptionThe LS279 consists of four individual and independent Set- to be indeterminate Both inputs are voltage level triggered Reset Latches with active low inputs Two of the four latch- and are not affected by transition time of the input data es have an additonal S input ANDed with the primary Sinput A low on any S input while the R input is high will be Features stored in the latch and appear on the corresponding Q out- Y Alternate military aerospace device (54LS279) is avail- put as a high A low on the R input while the S input is high able Contact a National Semiconductor Sales Office will clear the Q output to a low Simultaneous transistion of Distributor for specifications the R and S inputs from low to high will cause the Q output Connection Diagram Dual-In-Line Package Quad S-RLatches 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 6420 RRD-B30M105 Printed in U S A

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74LS279.pdf Datasheet