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ISRO | ISRO CS 2007 | Question 5
  • Last Updated : 20 Nov, 2018

The characteristic equation of an SR flip-flop is given by
(A) Qn+1 = S + RQn
(B) Qn+1= RQ’n + SQn
(C) Qn+1= S’ + RQn
(D) Qn+1 = S + R’Qn


Answer: (D)

Explanation: The characteristic table of an SR flip-flop is:

So, by simplifying using k-maps:
characteristic equation of an SR flip-flop = Qn+1 = S + R’Qn

Option(D) is correct.


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