74hc14 Oscillator Calculator

74HC14

The is a hex Schmitt trigger inverter frequently used to create simple, low-cost relaxation oscillators. Because it has built-in hysteresis (two separate switching thresholds), it can oscillate with just one resistor and one capacitor . Oscillator Circuit Design To build the oscillator, connect the components as follows:

Choose $C = 100 \text nF (1 \times 10^-7 \text F)$.
Rearranged: $R = \frac10.55 \times f \times C = \frac10.55 \times 1000 \times 1 \times 10^-7$
$R = 18.18 \text k\Omega$ (Use 18k or 20k standard value).

(Note: Some datasheets, like NXP or Texas Instruments, might specify a constant closer to $0.7$ or $1.0$ depending on their specific internal hysteresis values. Always check the specific datasheet for critical timing applications.) 74hc14 oscillator calculator

f=1.2100,000×0.00001=1.2 Hzf equals the fraction with numerator 1.2 and denominator 100 comma 000 cross 0.00001 end-fraction equals 1.2 Hz This results in a time period ( ) of approximately per cycle. Why the 74HC14? 74HC14 The is a hex Schmitt trigger inverter

Inverter pin: 1 → 2
R from output (pin 2) to input (pin 1)
C from input (pin 1) to GND
No second inverter – output is square wave (good for driving up to ~1 MHz).

2. The High-Frequency Limit ( > 1 MHz )