Question

What does the circle on the clock input of a J-K flip-flop mean?

(a) Level enabled

(b) Positive edge triggered

(c) negative edge triggered

(d) Level triggered

This question was posed to me in final exam.

The origin of the question is Triggering of Flip Flops topic in chapter Flip-Flops of Digital Circuits

Answer 1

Right option is (c) negative edge triggered

Explanation: The circle on the clock input of a J-K flip-flop mean negative edge triggered. Whereas the absence of triangle symbol implies that the flip-flop is level-triggered.