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How many types of sequential circuits are?

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in Digital Circuits by (773k points)
How many types of sequential circuits are?

(a) 2

(b) 3

(c) 4

(d) 5

I had been asked this question during an interview.

This interesting question is from Flip Flops topic in chapter Flip-Flops of Digital Circuits

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Correct answer is (a) 2

The best explanation: There are two type of sequential circuits viz., (i) synchronous or clocked and (ii) asynchronous or unclocked. Synchronous Sequential Circuits are triggered in the presence of a clock signal, whereas, Asynchronous Sequential Circuits function in the absence of a clock signal.

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