RS latch attached to divide by 4 circuit

Discussion in 'Homework Help' started by daskywalker, Apr 5, 2010.

  1. daskywalker

    Thread Starter New Member

    Mar 28, 2010
    Consider this circuit:

    Now instead of the CPU the output is attached to a synchronous divide by 4 counter made of two JK flip flops.

    The question is to explain why there is no bounce in the output of the RS latch used as a debounce switch. Use the RS latch state table to assist your explanation. You can assume that the switch moves and repeatedly returns to each contact as it is physically transferred from one contact to the other, but it never bounces (or oscillates) from one contact to the other. As the switch leaves the upper contact, it may return to it a couple of times and then when it finally breaks free it moves to the lower contact and then bounces once again a few times.

    Does it have something to do the fact that the latch is able to lock states at a certain high/low combination?
  2. beenthere

    Retired Moderator

    Apr 20, 2004