Question

Which of the following describes the operation of a positive edge-triggered D flip-flop?

(a) If both inputs are HIGH, the output will toggle

(b) The output will follow the input on the leading edge of the clock

(c) When both inputs are LOW, an invalid state exists

(d) The input is toggled into the flip-flop on the leading edge of the clock and is passed to the output on the trailing edge of the clock

This question was posed to me in an interview for job.

Enquiry is from D Flip Flop in division Flip-Flops of Digital Circuits

Answer 1

Correct choice is (b) The output will follow the input on the leading edge of the clock

Explanation: Edge-triggered flip-flop means the device will change state during the rising or falling edge of the clock pulse. The main phenomenon of the D flip-flop is that the o/p will follow the i/p when the enable pin is HIGH.