Monostable Multivibrator 555. When the ic 555 is used as a monostable multivibrator a positive going rectangular pulse is available at the output when a negative going pulse of short duration is applied at the trigger input. The ic 555 is one of the most popular and most widely used ic s.
A monostable multivibrator mmv often called a one shot multivibrator is a pulse generator circuit in which the duration of the pulse is determined by the r c network connected externally to the 555 timer. The output pulse width t is calculated with the following formula t 1 1 r c. The ic 555 is one of the most popular and most widely used ic s.
In such a vibrator one state of output is stable while the other is quasi stable unstable.
4 th pin is the reset pin of 555 timer which is active low so it is connected to vcc to avoid accidental resets. It is a versatile and extremely robust integrated circuit that is used in many applications like timers wave generators pulse and oscillators. The stable state can be chosen either high or low by the user. The 555 timer is capable of being used in astable and monostable circuits.
