# Clock signal - how to calculate

#### Morten Andersen

Joined Jun 7, 2019
25
Hello, i´m and engineering student at a danish University, and we have been given an assignment that requires the calculation of a clock signal.
Me and my work buddy is having some difficulties with this, as we have never tried calculating one before, but only worked with one handed to us.
We are to use a 74HC4060 chip for it, and there by needs to calculate the resistors and condensators size for a given frequency of the clock. Any one able to explain to me how we accomplish that? if there is a better way to generate a specific clock signal, im also interested in hearing about that.
-Morten.

#### djsfantasi

Joined Apr 11, 2010
8,779
Hello, i´m and engineering student at a danish University, and we have been given an assignment that requires the calculation of a clock signal.
Me and my work buddy is having some difficulties with this, as we have never tried calculating one before, but only worked with one handed to us.
We are to use a 74HC4060 chip for it, and there by needs to calculate the resistors and condensators size for a given frequency of the clock. Any one able to explain to me how we accomplish that? if there is a better way to generate a specific clock signal, im also interested in hearing about that.
-Morten.
As this is an university assignment, it belongs in Homework Help and will likely be moved there.

There are specific rules for Homework Help. No one should give you the answer, but can lead you to find the solution yourself. In order to get any benefit, you need to supply us with the work you have done thus far.

#### WBahn

Joined Mar 31, 2012
28,149
Hello, i´m and engineering student at a danish University, and we have been given an assignment that requires the calculation of a clock signal.
Me and my work buddy is having some difficulties with this, as we have never tried calculating one before, but only worked with one handed to us.
We are to use a 74HC4060 chip for it, and there by needs to calculate the resistors and condensators size for a given frequency of the clock. Any one able to explain to me how we accomplish that? if there is a better way to generate a specific clock signal, im also interested in hearing about that.
-Morten.
What frequency are you trying to get the clock to run at?

No one can even start to help you figure out component values unless you show the schematic of the circuit you are planning to use.

Try Googling for something like "generating clock using 4060" or similar.

#### BobTPH

Joined Jun 5, 2013
6,277
Have you looked at the datasheet? The formula is in there, though I admit it was a bit hard to find.

Bob

#### djsfantasi

Joined Apr 11, 2010
8,779
Have you looked at the datasheet? The formula is in there, though I admit it was a bit hard to find.

Bob

#### JohnInTX

Joined Jun 26, 2012
4,712
Welcome to AAC!
Here's the datasheet.
Good luck!

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#### BobTPH

Joined Jun 5, 2013
6,277
Ah, that one has the formula much better documented than the datasheet I looked at.

Bob

#### Morten Andersen

Joined Jun 7, 2019
25
I did look at a datasheet, but was unable to find a way to calculate the clock, and I looked at several pages too, but nothing useful was found. This datasheet however, it got exactly what i was looking for, thanks a lot!

#### BobTPH

Joined Jun 5, 2013
6,277
In the first datasheet, I looked at it was in the diagram showing how to connect for an RC oscillator. A note said:

T = 2.2 R C

This gives the period of oscillation and is equivalent to the:

f = 0.45 / RC