The 74HC14 contains 6 inverters. If you only use one for the oscillator, . Floating inputs can cause oscillations or excessive power draw.
f≈10.8⋅R⋅Cf is approximately equal to the fraction with numerator 1 and denominator 0.8 center dot cap R center dot cap C end-fraction Alternatively, a more simplified version often used is 1. Identify the Circuit Components 74hc14 oscillator calculator full