Question

What control signals may be necessary to operate a 1-line-to-16 line decoder?

(a) Flasher circuit control signal

(b) A LOW on all gate enable inputs

(c) Input from a hexadecimal counter

(d) A HIGH on all gate enable circuits

I had been asked this question at a job interview.

I would like to ask this question from Parity Generators/Checkers in chapter Combinational Circuits of Digital Circuits

Answer 1

Correct answer is (b) A LOW on all gate enable inputs

To explain: A LOW on all gate enable inputs is necessary to operate a 1-line-to-16 line decoder because enable pins are usually, active-low pins.