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Mod-N counter
How can we identify how many states the ripple counter is having by looking at the figure as it can also have some invalid states?


  
Total Answers and Comments: 1 Last Update: November 24, 2009     Asked by: mir_747 
  
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November 24, 2009 05:30:06   
RZara Member Since: November 2009   Contribution: 10    

RE: Mod-N counter
If in the ripple counter there are 3 flip flops it is a mod-8 counter which counts from 0-7(binary). If additional circuitry is used then it is a counter where few states have been trapped. Usually this is done by connecting a Nand gate output to the clear inputs of all the flip flops in a ripple counter. The clear signal is a active low signal and hence clears the flip flops to 000 when the output of the Nand gate goes low. The inputs to the Nand gates come from the flip flop outputs when they represent the count which we need to eliminate.

For ex: If a mod-8 counter is to be altered to count from 000-011 (0-6) i.e. we need to build a mod-7 counter from a mod-8 counter. To do this we need to clear the counter to 000 once the count reaches 7. In effect the counter needs to count from 0-6 and recycle back to 0. To do this connect the outputs of the flip flops which go high on a count of 7. This makes the output of the Nand gate high when a count of 7 is attempted and hence clears the count back to 000.

 
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In a ripple counter using edge-triggered JK flip-flop. the pulse input is applied to the 1. clock input of oll flip-flops 2. clock input of one flip-flop 3. J and K input of 
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in a ripple counter using edge-triggered JK flip-flop. the pulse input is applied to the 1. clock input of oll flip-flops 2. clock input of one flip-flop 3. J and K input of one 
Latest Answer : clock input of one flipflop ...
Read Answers (1) | Asked by : Rujul

How can we identify how many states the ripple counter is having by looking at the figure as it can also have some invalid states? 
Latest Answer : If in the ripple counter, there are 3 flip flops, it is a mod-8 counter which counts from 0-7(binary). If additional circuitry is used, then it is a counter where few states have been trapped. Usually this is done by connecting a Nand gate output to the ...
Read Answers (1) | Asked by : mir_747


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