The 74HC14 is a hex inverter with Schmitt-trigger inputs, which can be used to create an oscillator circuit. The IC contains six independent inverters, each with a Schmitt-trigger input that provides hysteresis, allowing the circuit to be used as an oscillator. The 74HC14 oscillator circuit is a simple and popular choice for many applications, including clock generation, timing circuits, and signal processing.
If you assume the 74HC14 is powered at 5V and has typical threshold voltages (approx 2.0V and 3.0V), the formula simplifies significantly. This is the formula used by most online calculators: 74hc14 oscillator calculator full
f equals the fraction with numerator 1 and denominator cap T end-fraction equals the fraction with numerator 1.25 and denominator cap R cap C end-fraction For example, using a F capacitor 0.00000001 Hz (12.5 kHz) The 74HC14 is a hex inverter with Schmitt-trigger