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Which of the following statements regarding binary counters are correct? (a) Clock inputs of all the flip - flops of a synchronous counter are applied from the same source whereas those in an asynchronous counter are from different sources. (b) The asynchronous counter has ripple effects whereas the synchronous counter does not. (c) Only J-K flip-flops can be used in synchronous counters whereas asynchronous counters can be designed with any kind of flip flops. (d) Latches can be used for designing asynchronous counters. Code :

Which of the following statements regarding binary counters are correct? (a) Clock inputs of all the flip - flops of a synchronous counter are applied from the same source whereas those in an asynchronous counter are from different sources. (b) The asynchronous counter has ripple effects whereas the synchronous counter does not. (c) Only J-K flip-flops can be used in synchronous counters whereas asynchronous counters can be designed with any kind of flip flops. (d) Latches can be used for designing asynchronous counters. Code : Correct Answer (a), (b) and (d) only

Concept:

Synchronous counter:

  • It can be designed with any flipflop.
  • The synchronous counter doesn’t have a ripple effect
  • Some clock pulse is applied to all flip flops.

Asynchronous counter:

  • It can be designed with any flipflop.
  • It has a ripple effect.
  • Different clock pulses are provided to flipflops.

 

Delay Problem:

  • In asynchronous counters, the output of the previous stage serves as the clock of the next stage.
  • As the number of stages increases the propagation delay of each flip flop stage adds up resulting in the propagation delay to become significant.

[ alt="26 June 1" src="//storage.googleapis.com/tb-img/production/19/08/26%20June_1.png" style="width: 160px; height: 46px;">

Synchronous UP-DOWN counter:

[ alt="D1" src="//storage.googleapis.com/tb-img/production/19/03/D1.PNG" style="width: 400px; height: 182px;">

Johnson Counter:

[ alt="D2" src="//storage.googleapis.com/tb-img/production/19/03/D2.PNG" style="width: 400px; height: 158px;">

Ring counter:

[ alt="d4" src="//storage.googleapis.com/tb-img/production/19/03/d4.PNG" style="width: 400px; height: 149px;">

 

Ripple Counter:

[ alt="d3" src="//storage.googleapis.com/tb-img/production/19/03/d3.PNG" style="width: 398px; height: 163px;">

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