SCEA094 October 2020 SN74AUP1G17 , SN74LVC1G17 , SN74LVC1G17-Q1
Many physical switches can bounce for hundreds of microseconds after being pressed, while most logic devices respond in just a few nanoseconds. This can result in false triggers and erroneous output. By adding an appropriate debounce circuit between a button and a CMOS input, these bounces can be eliminated.
See more about this use case in the Logic Minute video Debounce a Switch.
Capacitor (μF) | Time Constant (ms)(1) | ||
---|---|---|---|
R = 10 kΩ | R = 100 kΩ | R = 1 MΩ | |
1 | 10 | 100 | 1000 |
0.1 | 1 | 10 | 100 |
0.01 | 0.1 | 1 | 10 |