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Chapter 5

Chapter 5. Flip Flop. Flip Flop. Flip flop is the most important memory element and its made of an assembly of logic gates. NAND Gate Latch. NAND Gate Latch. EXAMPLE 5-1. The waveform below are applied to NAND latch. Assume initially Q=0, and determine Q waveform. NOR GATE LATCH.

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Chapter 5

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  1. Chapter 5 Flip Flop

  2. Flip Flop • Flip flop is the most important memory element and its made of an assembly of logic gates.

  3. NAND Gate Latch

  4. NAND Gate Latch

  5. EXAMPLE 5-1 • The waveform below are applied to NAND latch. Assume initially Q=0, and determine Q waveform.

  6. NOR GATE LATCH

  7. Example 5-3 • Assume that Q=0 initially, determine the Q waveform for the NOR latch input shown below:

  8. Clock Signals & Clocked Flip-Flop • In synchronous systems, the exact times at which any output can change states are determined by a signal called the Clock. • When the clock changes from 0 to 1, this is called positive-going transition (PGT). • When the clock changes from 1 to 0, this is the negative going transition.

  9. Clock Signals & Clocked Flip-Flop

  10. CLOCKED S-C FLIP FLOP

  11. CLOCKED S-C FLIP FLOP

  12. CLOCKED J-K FLIP FLOP

  13. CLOCKED D FLIP FLOP

  14. D-LATCH (TRANSPARENT LATCH)

  15. EXAMPLE: Determine Q waveform for the given EN and D inputs.

  16. ASYNCHRONOUS INPUTS • Asynchronous inputs can be used to set the FF to the 1 state or clear the FF to the 0 state at any time.

  17. Example:

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