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What is the maximum counting speed of a $4$-bit binary counter which is composed of Flip-Flop with a propagation delay of $25\:ns$?

  1. $1 \text{MHz}$
  2. $10 \text{MHz}$
  3. $100 \text{MHz}$
  4. $4 \text{MHz}$
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Question is about frequency of the counter.
Frequency = 1/ Time
Binary counter is ripple counter where the output one flip flop is clock input to next flip flop.
So, maximum delay(time)= 4*25ns = 100 ns.
frequency=1/100 ns
= 10 MHz.
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(B) 10 MHz...

 

4 Bit binary counter(asynchronous counter) means..

There are 4 flip flops and each flip flop delay is 25ns …

 

So total delay 4*25ns

= 100ns …

 

Counting speed

= frequency of the output

= 1/100

=10Mhz …

 

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