Based on the design approach in Exercise 1 and the answer to Exercise 2, what is the maximum counting speed (frequency) for a 4-bit ripple counter using 74HCT flip-flops? Repeat, using 74AHCT and 74LS74 flip-flops.
Exercise 1
Design a 4-bit ripple down counter using four D flip-flops and no other components.
Exercise 2
What limits the maximum counting speed of a ripple counter, if you don’t insist on being able to read the counter value at all times?
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