So it is called as “MOD-4 counter” or “Modulus 4 counter”. The maximum number of states that a counter can have is 2n where n represents the number of flip flops used in counter.įor example, if we have 2 flip flops, the maximum number of outputs of the counter is 4 i.e. The number of output states of counter is called “Modulus” or “MOD” of the counter. The number of flip flops used in a ripple counter is depends up on the number of states of counter (ex: Mod 4, Mod 2 etc). Another name for Asynchronous counters is “Ripple counters”. The required number of logic gates to design asynchronous counters is very less. Because the flip flops in asynchronous counters are supplied with different clock signals, there may be delay in producing output.
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