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                                                                                                 SN54/74LS279
QUAD SET-RESET LATCH


               VCC   S1        R         Q        S1     S2     R    Q
                16   15        14        13       12     11     10   9                            QUAD SET-RESET LATCH
                                                                                                      LOW POWER SCHOTTKY




               1     2         3         4        5       6     7     8
               R     S1       S2         Q        R       S1    Q    GND                                                J SUFFIX
                                                                                                                        CERAMIC
                                                                                                                       CASE 620-09
                                TRUTH TABLE                                                      16
                                                                                                       1
                                INPUT                  OUTPUT
                          S1        S2        R          (Q)
                                                                                                                        N SUFFIX
                          L         L         L            h                                                            PLASTIC
                          L         X         H            H                                     16                    CASE 648-08
                          X         L         H            H
                                                                                                       1
                          H         H         L            L
                          H         H         H        No Change
                      L = LOW Voltage Level
                      H = HIGH Voltage Level                                                                            D SUFFIX
                      X = Don't Care                                                                                      SOIC
                                                                                                      16
                      h = The output is HIGH as long as                                                    1          CASE 751B-03
                      h = S1 or S2 is LOW. If all inputs go
                      h = HIGH simultaneously, the output
                      h = state is indeterminate; otherwise,
                      h = it follows the Truth Table
                                                                                                      ORDERING INFORMATION
                                                                                                       SN54LSXXXJ   Ceramic
                                                                                                       SN74LSXXXN   Plastic
                                                                                                       SN74LSXXXD   SOIC



GUARANTEED OPERATING RANGES
      Symbol                                  Parameter                                   Min              Typ      Max        Unit
 VCC            Supply Voltage                                                    54      4.5              5.0      5.5         V
                                                                                  74      4.75             5.0      5.25
 TA             Operating Ambient Temperature Range                               54      

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