ELEVATE SKILLS!
Q: 1 The number of unused states in a 4-bit switch tail ring counter, (Johnson Counter) are
2
4
8
12
[ Option C ]
In a 4-bit Johnson counter (also called a switch-tail ring counter), the total number of possible states is 24=16. However, a Johnson counter produces only 2n unique states, where n is the number of flip-flops. For n=4, the number of valid states is 2×4=8. Therefore, the number of unused or invalid states is 16−8=8.
Q: 2 In a 4-stage ripple counter, the propagation delay of a flip-flop is 50ns. If the pulse width of the strobe is 30ns, find the maximum frequency at which the counter operates reliably.
10.0 MHz
20.0 MHz
7.5 MHz
4.35 MHz
[ Option D ]
Q: 3 How many unique states can a K-bit switch tail ring counter generate?
2K
Kn
2K
K
[ Option A ]
Q: 4 How many decade counters are connected in cascade to count from 0 to 999?
5
6
9
3
[ Option D ]
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