: Because it is an inverter, a LOW input results in a HIGH output (approximately equal to the supply voltage, VCCcap V sub cap C cap C end-sub
tlow=R⋅C⋅ln(VT+VT−)t sub l o w end-sub equals cap R center dot cap C center dot l n open paren the fraction with numerator cap V sub cap T plus end-sub and denominator cap V sub cap T minus end-sub end-fraction close paren Step 3: Total Period ( ) and Frequency (
For a more accurate theoretical calculation that accounts for the actual thresholds of your specific device, use the following formula, which is derived from the capacitor's charge/discharge equations:
Below is a visualization of the capacitor voltage oscillating strictly between the VT−cap V sub cap T minus end-sub VT+cap V sub cap T plus end-sub thresholds alongside the matching output square wave. 5. Component Selection & Constraints
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Duty Cycle (%)=(thighthigh+tlow)⋅100%Duty Cycle (%) equals open paren the fraction with numerator t sub h i g h end-sub and denominator t sub h i g h end-sub plus t sub l o w end-sub end-fraction close paren center dot 100 % 4. Standard 74HC14 Parameter Values The threshold voltages ( VT+cap V sub cap T plus end-sub VT−cap V sub cap T minus end-sub ) change dynamically depending on your supply voltage ( VCCcap V sub cap C cap C end-sub
This mode works identically to solving for R, but is used when you already have a resistor value selected. Input your target frequency, resistor value (R), and supply voltage, and the calculator will determine the needed capacitance (C). This method is particularly useful when you want to use a specific resistor to set the frequency, such as a potentiometer for a variable oscillator.