# Need Help Finding the Output Frequencies for Two 4-Bit Binary Counters

May 13, 2015
4

I need some help on figuring out how to find the output frequencies (Q0-Q3) for these two counters (Z1 and Z2), which are made up of 2, 4-Bit Binary IC 74LS293 chips. I found the frequency of Q3 on Z1 by performing 44.8 freq. / 16 mod# = 2.8. Though I am unsure on how the obtain the rest of these required frequencies.

Any assistance is most definitely appreciated!

Last edited:

#### Arouse1973

Dec 18, 2013
5,178
Hello do you have a circuit diagram of how you have it all connected.

May 13, 2015
4
As in the pin diagram? I can get you that, I'm only utilizing the two IC chips.

#### Arouse1973

Dec 18, 2013
5,178
How have you connected them?

May 13, 2015
4

#### Arouse1973

Dec 18, 2013
5,178
Can you tell me if CLK0 is the same as CLKA on the datasheet? And I am guessing Q0-Q3 is QA-QD. It's just the datasheet is different to your drawing.

May 13, 2015
4
Yeah CLK0 would be CLKA. And yes, the outputs you wrote are right.

#### Arouse1973

Dec 18, 2013
5,178
Tricky one this is so I had a go and simulated it and counted the pulses. Your output x appears to change state every 24 clock pulses and the other output goes low after 8 and high after 16. This adds up to 24, which make sense. Don't know if this helps.

#### Laplace

Apr 4, 2010
1,252
It appears to me that the circuit has four separate counter sections wired in series in the following order: ÷4,÷2,÷6,÷2 for a total ÷96. Have not done much work to verify correctness, but that is my first impression.

Replies
11
Views
1K
Replies
4
Views
1K
Replies
3
Views
2K
Replies
3
Views
2K
Replies
6
Views
2K