[ T = R C \left[ \ln\left( \fracV_OH - V_T-V_OH - V_T+ \right) + \ln\left( \fracV_T+V_T- \right) \right] ]
A 74HC14 oscillator functions by exploiting the chip's internal . 74hc14 oscillator calculator full
To make it easier to calculate the oscillator frequency, you can use an online calculator or create a simple spreadsheet with the following formulas: [ T = R C \left[ \ln\left( \fracV_OH
[ \boxedf \approx \frac10.8 \cdot R \cdot C ] 74hc14 oscillator calculator full
The magic comes from the . Unlike a regular logic gate, the 74HC14 has two distinct threshold voltages:
Because the 74HC14 has a hysteresis window that is roughly centered around $V_DD/2$ (but rarely perfectly centered), the output duty cycle is . It is typically between 40% and 60%.