MC74LCX74 Low-Voltage CMOS Dual D-Type Flip-Flop With 5 VTolerant Inputs The MC74LCX74 is a high performance, dual Dtype flipflop MC74LCX74 4 SD1 SD 2 5 D1 D O1 Q 6 3 O1 Q CP1 CP V CD2 D2 CP2 SD2O2 O2 CC CD 14 13 12 11 10 9 8 1 CD1 10 SD2 1 2 34567 SD CD1 D1 CP1 SD1O1 O1 GND 12 9 D2 D Figure 1. Pinout: 14Lead (Top View) O2 Q 8 11 O2 Q CP2 CP CD 13 CD2 Figure 2. Logic Diagram PIN NAMES Pins Function CP1, CP2 Clock Pulse Inputs D1 D2 Data Inputs CD1, CD2 Direct Clear Inputs SD1, SD2 Direct Set Inputs OnOn Outputs TRUTH TABLE Inputs Outputs SDn CDn CPn Dn On On Operating Mode L H X X H L Asynchronous Set H L X X L H Asynchronous Clear L L X X H H Undetermined H H h H L Load and Read Register H H l L H H H X NC NC Hold H = High Voltage Level h = High Voltage Level One Setup Time Prior to the LowtoHigh Clock Transition L = Low Voltage Level l = Low Voltage Level One Setup Time Prior to the LowtoHigh Clock Transition NC = No Change X = High or Low Voltage Level and Transitions are Acceptable = LowtoHigh Transition = Not a LowtoHigh Transition For I reasons, DO NOT FLOAT Inputs CC