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CSL 202, Counters using Flipflops
- 1. 1 CSL 202, CountersUsing Flipflops MEC
- 2. 2 Contents • Counters usingFlipflop ICs. • Ring and Johnson Counters. • Asynchronous Counters. • Synchronous Counters. • UP/Down Counters. • Decade Counters. • Timing Diagrams. • Counter Applications.
- 3. 3 Counters using Flipflops •Use of D flipflops or JK flipflops in T flipflop configuration. • Each flipflop divides input frequency by two – frequency divider. • Counters can be binary or biquinary. • Binary Counters – straight sequence. • Biquinary Counters – skip interim states. • Counters can be synchronous (clock driven) or asynchronous (ripple counter).
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- 5. 5 Asynchronous Counters • Alsocalled ripple counters. • Clock trigger to toggle LSB. • Output of one flipflop to serve as clock for succeeding flipflop. • Number of flipflops depend on maximum count and the total number of states of the counter. • Maximum number of states = 2N, N – number of flipflops.
- 6. 6 Synchronous Counter • Allflipflops clocked from a single source. • Clock common to all flipflops. • Flipflops change states in synchronism with the clock. • Number of flipflops depend on the maximum count and total number of states of the counter. • Maximum number of states = 2N, N – number of flipflops.
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- 8. 8 Johnson Counter (Twisted RingCounter)
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- 10. 10 4 bit AsynchronousUp Counter
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- 12. 12 4 bit AsynchronousDown Counter FF0 FF1 FF2 FF3
- 13. 13 4 bit AsynchronousDown Counter
- 14. 14 3 bit AsynchronousUp/Down Counter
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- 17. 17 4 bit SynchronousUp Counter FF0 FF1 FF2 FF3
- 18. 18 4 bit SynchronousUp Counter
- 19. 19 4 bit SynchronousDown Counter FF0 FF1 FF2 FF3
- 20. 20 4 bit SynchronousDown Counter
- 21. 21 3 bit SynchronousUp/Down Counter
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- 27. 27 Procedure • Assemble thecircuits on the breadboard provided along with the trainer kit. • Initial reset/clear and LSB preset for the ring counter. • Clock input to be applied from the clock source provided in the trainer kit. • Outputs to be observed using LEDs provided in the trainer kit. • Verify the state tables and draw timing diagrams.
- 28. 28 Youtube Resources • https://www.youtube.com/watch?v=KAPdy K1LxHg •https://www.youtube.com/watch?v=UHkR1 0Tvz5w • https://www.youtube.com/watch?v=uUVj5j CQMdc • https://www.youtube.com/watch?v=Kk78Z PskzTw • https://www.youtube.com/watch?v=- SFU5voStlw
- 29. 29 Youtube Resources • https://www.youtube.com/watch?v=4PoFz srA834 •https://www.youtube.com/watch?v=Qp2C- 3kw_xk • https://www.youtube.com/watch?v=Qp2C- 3kw_xk • https://www.youtube.com/watch?v=4PoFz srA834
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