Hi ariakovo,
I understand how datasheets can be confusing, because other applications than the one you want may also be presented. In the case of the 567, go to its page 8.
You will see a circuit called AC test circuit and application information on the right side that gives the formula for calculating the frequency you need. In this case, it is:
1/(1.1*R1*C1)
I have attached a part of a schematic from a circuit I built with actual values. I don't recall at the moment what its frequency was. On that circuit, the components to adjust the frequency are labeled C4, R7, and R8. That is, the RC filter attached to pins CT and RT. YOu will need to calculate appropriate values for the frequency you decide to use. Good luck. John