74hc14 Oscillator Calculator Full [best] Jun 2026

Happy oscillating!

The 74HC14 can realistically oscillate up to 10 MHz – 20 MHz at 6V. Beyond this, the internal propagation delays of the logic gates become the limiting factor rather than your RC network. 74hc14 oscillator calculator full

Selecting the correct resistor and capacitor values is the most critical step in designing a reliable 74HC14 oscillator. Happy oscillating

[ f \approx \frac1R \cdot C \cdot 0.809 ] [ f \approx \frac1.236R \cdot C ] Selecting the correct resistor and capacitor values is

At very high frequencies (approaching 10 MHz), the internal propagation delay of the inverter (approx 15–30 ns) becomes a significant fraction of the period. A full calculator must include a term for ( t_pd ).

Discharging (output low): capacitor discharges from Vth+ to Vth− toward 0: Vc(t) = Vth+·e^(−td/(R·C)) Solve for tdis when Vc(tdis) = Vth−: Vth− = Vth+·e^(−td/(R·C)) => tdis = R·C · ln(Vth+/Vth−)

The fundamental 74HC14 oscillator requires only three components: