DM74LS74A Datasheet | National Semiconductor

Description This device contains two independent positive-edge-triggered D flip-flops with plementary outputs The information on the D input is accepted by the flip-flops on the positive going edge of the clock pulse The triggering occurs at a voltage level and is not directly related to the transition time of the rising edge of the clock The data on the D input may be changed while the clock is low or high without affecting the outputs as long as the data setup and hold times are not violated A low logic level on the preset or clear inputs will set or reset the outputs regardless of the logic levels of the other inputs Features Alternate military aerospace device (54LS74) is available Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package TL F 6373 - 1 Order Number 54LS74DMQB 54LS74FMQB 54LS74LMQB DM54LS74AJ DM54LS74AW DM74LS74AM or DM74LS74AN See NS Package Number E20A J14A M14A N14A or W14B Function Table Inputs PR L H L H H H CLR H L L H H H CLK X X X D X X X H L X Outputs Q H L H H L Q0 Q L H H L H Q0 u u H e High Logic Level X e Either Low or High Logic Level L e Low Logic Level u e Positive-going Transition e This configuration is nonstable that is it will not persist when either the preset and or clear inputs return to their inactive (high) level Q0 e The output logic level of Q before the indicated input conditions were established C1995 National Semiconductor Corporation TL F 6373 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range b 55 C to a 125 C DM54LS and 54LS DM74LS 0 C to a 70 C Storage Temperature Range b 65 C to a 150 C Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed...