54AC378 Datasheet | National Semiconductor

Description The ’AC378 is a 6-bit register with a buffered mon Enable This device is similar to the ’AC174 but with mon Enable rather than mon Master Reset Features Y Y Y Y Y 6-bit high-speed parallel register Positive edge-triggered D-type inputs Fully buffered mon clock and enable inputs Input clamp diodes limit high-speed termination effects Standard Military Drawing (SMD) ’AC378 5962-91605 Logic Symbols Connection Diagrams Pin Assignment for DIP SOIC and Flatpak Pin Assignment for LCC TL F 10231- 1 TL F 10231 - 3 IEEE IEC TL F 10231 - 2 TL F 10231- 4 Pin Names E D0 - D5 CP Q0 - Q5 Description Enable Input (Active LOW) Data Inputs Clock Pulse Input (Active Rising Edge) Outputs FACTTM is a trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 10231 RRD-B30M75 Printed in U S A Functional Description The ’AC378 consists of six edge-triggered D-type flip-flops with individual D inputs and Q inputs The Clock (CP) and Enable (E) inputs are mon to all flip-flops When the E input is LOW new data is entered into the register on the LOW-to-HIGH transition of the CP input When the E input is HIGH the register will retain the present data independent of the CP input Truth Table Inputs E H L L CP L L L Dn X H L Output Qn No Change H L H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial L e LOW-to-HIGH Clock Transition Logic Diagram TL F 10231 - 5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays Absolute Maximum Ratings (Note 1) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage (VCC) DC Input Diode Current (IIK) VI e b0 5V VI e VCC a 0 5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO e b0 5V VO e VCC a 0 5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground...