I'm trying to setup two 4060 counter ICs, to run from internal rc oscillator. The first one will be set to 32Hz, and its pin 3 output (which divides the input clock by 1024), will be fed to pin 11 of the other 4060 IC, so from the pin 3 of the second counter, I can have 32768 seconds delays.(that's 32x32)
Since I don't want to use another chip or a crystal, i need to setup the first 4060 ic to run at 32 Hz.
From datasheet, pins 9,10,11 are used to set a frequency. I can't understand what are the R2 and C2 mentioned ? What value should they be?
I think I can use Rt=28.9k, and Ct=470nF From the formula I get: F = 1 ÷ (2.3 x 28900 x 0.00000047) which equals to 32.009 Hz
But I don't know if the conditions in datasheet are met or not. (R2 should be much greater that Rt , and Ct much bigger than C2)
IC part number : HEF4060BT by NXP View Datasheet