Question

The designation  means that the ________

(a) Up count is active-HIGH, the down count is active-LOW

(b) Up count is active-LOW, the down count is active-HIGH

(c) Up and down counts are both active-LOW

(d) Up and down counts are both active-HIGH

The question was asked in a national level competition.

Origin of the question is Up Down Counter topic in section Counters of Digital Circuits

Answer 1

Correct answer is (a) Up count is active-HIGH, the down count is active-LOW

To explain: The designation means that the up count is active-HIGH, the down count is active-LOW. Active-High means that up-count would be triggered when clock is 1 else when clock is 0, down-count would be triggered, which is referred to as Active-low.