The 555 has three operating modes:
- Monostable mode: in this configuration, the IC 555 works as a trigger. Applications include timers, pulse detector, keys immune to noise, touch switches, etc..
Astable mode: the IC 555 operates as an oscillator. Uses include LED flasher, pulse generators, clocks, tone generators, security alarms, etc..
Bistable mode: CI 555 can operate as a flip-flop, if the DIS pin is not connected and no capacitor is used. Applications include switches immune to noise, etc..
Curiosity: the name "555" was adopted in allusion to the fact that there is an internal network (voltage divider) three 5k resistors (1K = 1000) ohms that serve as reference voltage for the integrated circuit comparators.
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