1. ©2004 Brooks/Cole FIGURES FOR CHAPTER 11 LATCHES AND FLIP-FLOPS Click the mouse to move to the next page. Use the ESC key to exit this chapter. This chapter in the book includes: Objectives Study Guide 11.1Introduction 11.2Set-Reset Latch 11.3Gated D Latch 11.4Edge-Triggered D Flip-Flop 11.5S-R Flip-Flop 11.6J-K Flip-Flop 11.7T Flip-Flop 11.8Flip-Flops with Additional Inputs 11.9Summary Problems Programmed Exercise

2. ©2004 Brooks/Cole Figure 11-1

3. ©2004 Brooks/Cole Figure 11-2

4. ©2004 Brooks/Cole Figure 11-3

5. ©2004 Brooks/Cole Figure 11-4

6. ©2004 Brooks/Cole Figure 11-5: S-R Latch

7. ©2004 Brooks/Cole Figure 11-6: Improper S-R Latch Operation

8. ©2004 Brooks/Cole Figure 11-7: Timing Diagram for S-R Latch

9. ©2004 Brooks/Cole Table 11-1. S-R Latch Operation

10. ©2004 Brooks/Cole Figure 11-8: Map for Q(t + )

11. ©2004 Brooks/Cole Figure 11-9: Switch Debouncing with an S-R Latch

12. ©2004 Brooks/Cole Figure 11-10: S-R Latch

13. ©2004 Brooks/Cole Figure 11-11: Gated D Latch

14. ©2004 Brooks/Cole Figure 11-12 (left): Symbol and Truth Table for Gated Latch

15. ©2004 Brooks/Cole Figure 11-12 (continued)

16. ©2004 Brooks/Cole Figure 11-13: D Flip-Flops (c) truth table Q = D +

17. ©2004 Brooks/Cole Figure 11-14: Timing for D Flip-Flop (Falling Edge Trigger)

18. ©2004 Brooks/Cole Figure 11-15: D Flip-Flop (Rising Edge Trigger)

19. ©2004 Brooks/Cole Figure 11-16: Setup and Hold Times for an Edge-Triggered D Flip-Flop

20. ©2004 Brooks/Cole Figure 11-17: Determination of Minimum Clock Period

21. ©2004 Brooks/Cole Figure 11-18: S-R Flip-Flop Operation summary: S = R = 0no state change S = 1, R = 0set Q to 1 (after active Ck edge) S = 0, R = 1reset Q to 0 (after active Ck edge) S = R = 1not allowed

22. ©2004 Brooks/Cole Figure 11-19: S-R Flip-Flop Implementation and Timing

23. ©2004 Brooks/Cole Figure 11-20ab: J-K Flip-Flop (Q Changes on the Rising Edge) (b)

24. ©2004 Brooks/Cole Figure 11-20c: J-K Flip-Flop (Q Changes on the Rising Edge)

25. ©2004 Brooks/Cole Figure 11-21: Master-Slave J-K Flip-Flop (Q Changes on Rising Edge)

26. ©2004 Brooks/Cole Figure 11-22ab: T Flip-Flop Q + = T'Q + TQ' = Q  T (b)

27. ©2004 Brooks/Cole Figure 11-23: Timing Diagram for T Flip-Flop (Falling-Edge Trigger)

28. ©2004 Brooks/Cole Figure 11-24: Implementation of T Flip-Flops

29. ©2004 Brooks/Cole Figure 11-25: D Flip-Flop with Clear and Preset ↑ ↑ ↓

30. ©2004 Brooks/Cole Figure 11-26: Timing Diagram for D Flip-Flop with Asynchronous Clear and Preset

31. ©2004 Brooks/Cole Figure 11-27: D Flip-Flop with Clock Enable