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

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

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

Bistable Mode


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