A strange problem with CMOS Up/Down counter

Hey all,

Been searching for topics relating to what I have been experiencing and
to no avail.

Hopefully some of you might have a hint or tip. I am using a TI
CD40110B CMOS Up/Down decade counter. It has a separate clock up and
clock down. I connected to a Kingston 7-segment LED and here's what I
have been observing:

1. Counting up from 0 to 9 is ok.

2. Counting from 0 to 1 to 2 to 3 back to 2, when clock up is activated
nothing happens. When activated AGAIN, it jumps to 3.

3. Counting down from 9 to 2 to 3 then back to 2. Then clock up is
activated, nothing happens. When activated again, it jumps to 3.

I can't seem to figure out what's the problem. It only happens when one
returns from 3 to 2 and making an attempting back to 3.

If you have any suggestion, please post. Thanks for reading.

.

Relevant Pages

  • Re: A strange problem with CMOS Up/Down counter
    ... Been searching for topics relating to what I have been experiencing and ... Hopefully some of you might have a hint or tip. ... It has a separate clock up and ... When activated AGAIN, it jumps to 3. ...
    (sci.electronics.design)
  • Re: A strange problem with CMOS Up/Down counter
    ... It has a separate clock up and ... When activated AGAIN, it jumps to 3. ... transition during your step 1 and what should be the ...
    (sci.electronics.design)