Problem with 74LS390 counter

Discussion in 'The Projects Forum' started by PraveshKoirala, Mar 8, 2012.

  1. PraveshKoirala

    Thread Starter New Member

    Jan 25, 2012
    Me and my friends are developing a digital clock for our Project. The problem is that the counter we are using 74LS390 produces unexpected results. For instance, when the expected output from the counter is 2, it oscillates between 2 and 6. And then when the counter transitions from one value to another, the transition is not *clean*. It first transitions from one to another but some traces of the previous inputs are still present and then they vanish slightly. In some cases it just oscillates. Can anyone help??
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    Please post a circuit diagram.