Question

With regard to a D latch ________

(a) The Q output follows the D input when EN is LOW

(b) The Q output is opposite the D input when EN is LOW

(c) The Q output follows the D input when EN is HIGH

(d) The Q output is HIGH regardless of EN’s input state

This question was posed to me in exam.

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

Answer 1

Correct choice is (c) The Q output follows the D input when EN is HIGH

The best explanation: Latch is nothing but flip flop which holds the o/p or i/p state. And in D flip-flop output follows the input. It stores the value on the data line.