Digital Electronics - Flip-Flops - Discussion


Two J-K flip-flops with their J-K inputs tied HIGH are cascaded to be used as counters. After four input clock pulses, the binary count is ________.

[A]. 00
[B]. 11
[C]. 01
[D]. 10

Answer: Option A


No answer description available for this question.

Gurpreet said: (Jun 13, 2012)  
Every O/P repeats after its mod here mod is 4 so after 4 clk pulses the O/P repeats i.e. 00.

Prashanth Pj said: (Jun 25, 2016)  
Since the flip-flop is in toggle state(j=k=1), count starts from 00, 11, 00, 11, 00. So after the fourth pulse the state is 00.

Neha said: (Oct 8, 2017)  
Thanks @Prashanth.

Prateek said: (Jul 26, 2018)  
Since it is cascaded i guess output q from 1st jk flip-flop drives clock of 2nd flip-flop. So if we assume initially q2q1=00.

Then further count sequence will be 11..10...01...00.

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