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Ic 555 Unit 5 Essay

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The IC 555 has 8 pins and the function of each pin is as follows[4]:
Pin-1: The ground terminal pin. All voltages are measured in respect to the ground terminal.[3]
Pin-2: The trigger pin. This pin is used to feed the trigger input only when the IC 555 is set up as a monstable multivibrator. It is responsible for the transition of the flip-flop from set to reset. The amplitude of the external pulse applied to this pin determines the output of the timer. A negative pulse which has a DC level greater than Vcc/3 is applied at this terminal, as the trigger pulse passes through the Vcc/3, the output of the lower comparator becomes high and the complimentary of Q becomes zero. The IC 55 output therefore gets a high voltage and is then in the astable mode. …show more content…
This produces the output of the timer. The load can be connected in two ways to the pin. One way is for the connection to take place between the output pin and the ground pin which is called the normally on load or between the output pin and the supply pin called the normally off the load.
Pin-4: The reset terminal. A negative pulse is applied to this pin in order to reset the IC.
Pin-5: The control voltage terminal: This pin controls the threshold and trigger levels. The external voltage which is applied to this pin is used to modulate the output waveform. The amount of voltage which is applied to this terminal decides when the comparator is to be switched. It is connected to a 0.01 micro Farad resistor through the ground to avoid any noise problem.
Pin-6: The threshold terminal: This pin is the non- inverting input terminal which is of comparator 1 and it compares the voltage that is applied to the terminal with a reference voltage of 2/3 VCC. The magnitude of the voltage applied is responsible for the set state of flip- flop. The output gets reset when the voltage applied is greater than 2/3Vcc and the upper comparator switches to

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