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 An eight stage ripple counter uses a flip-flop with propagation delay of 75 nano-seconds. The pulse width of the strobe is 50 nano-seconds. The frequency of the input signal which can be used for proper operation of the counter is approximately equal to
  • a)
    500 MHz
  • b)
    2 MHz
  • c)
    4 MHz
  • d)
    1.5 MHz
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
An eight stage ripple counter uses a flip-flop with propagation delay ...
Maximum time taken for all flip-flops to stabilize is (75 ns x 8) + 50 ns = 650 ns.
Frequency of operation must be less than

Thus, option (d) is correct.
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Most Upvoted Answer
An eight stage ripple counter uses a flip-flop with propagation delay ...
Propagation delay and pulse width
- The propagation delay of a flip-flop is the time it takes for the output to respond to a change in the input.
- In this case, the flip-flop used in the ripple counter has a propagation delay of 75 nanoseconds.
- The pulse width of the strobe signal, which is the input signal to the counter, is given as 50 nanoseconds.

Proper operation of the counter
- For proper operation of the counter, the pulse width of the strobe signal should be longer than the propagation delay of the flip-flop.
- This ensures that the flip-flop has enough time to respond to the input signal before it changes again.

Calculating the maximum frequency
- The maximum frequency that can be used for proper operation of the counter can be calculated by finding the inverse of the total time required for one cycle.
- The total time required for one cycle is the sum of the propagation delay and the pulse width.
- In this case, the total time required for one cycle is 75 nanoseconds + 50 nanoseconds = 125 nanoseconds.
- The maximum frequency is the inverse of the total time required for one cycle.
- Therefore, the maximum frequency is 1 / (125 nanoseconds) = 8 MHz.

Approximating the frequency
- The question asks for the approximate frequency that can be used for proper operation of the counter.
- Among the given options, the closest option to 8 MHz is 1.5 MHz (option D).
- Therefore, the approximate frequency that can be used for proper operation of the counter is 1.5 MHz.

Conclusion
- The frequency of the input signal that can be used for proper operation of the eight-stage ripple counter is approximately 1.5 MHz.
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An eight stage ripple counter uses a flip-flop with propagation delay of 75 nano-seconds. The pulse width of the strobe is 50 nano-seconds. The frequency of the input signal which can be used for proper operation of the counter is approximately equal toa)500 MHzb)2 MHzc)4 MHzd)1.5 MHzCorrect answer is option 'D'. Can you explain this answer?
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