Re: How to design a crystall oscilator circuit using CMOS 40106 DESIGN
The capacitor values come from the crystal manufacturers data sheet, if you use 33pF or 39pF it should work fine, the values are not particularly critical.
Likewise, use the resistor values for 5MHz, R1 will stay the same regardless of the frequency, it is just to provide some DC feedback for the inverter, R2 governs the feedback (drive) level to the crystal but using 5K should be fine to keep the level within a safe range.
Brian.