555 Timer LED Flasher - Operating Modes of 555 Timer
Operating Modes of 555 Timer
The 555 Timer IC has basically three operating modes.
- Monostable Mode
- Astable Mode
- Bistable Mode
Monostable Mode
- In this mode, the IC generates only single pulse when the timer obtains a signal from the triggers input button.
- Period of the pulse depends upon the Resistor and Capacitor values.
Monostable Mode
Astable Mode
- In this mode, the IC generates nonstop pulses with exact frequency depends on the values of the two Resistors and Capacitors.
Astable Mode
Bistable Mode
In this mode, the IC generates two stable states :
- High
- Low
The output signal of these two states are forbidden by a trigger and reset input pins, not by the charging and discharging of the capacitors.
Bistable Mode