The output of the timer depends upon the amplitude of the external trigger pulse applied to this pin. This pin is responsible for transition of the flip-flop from set to reset. The output will remain high until a high voltage is applied to the threshold input (pin number 6). ground reference voltage.Ī low voltage (less than 1/3 the supply voltage) applied for a very short time to the trigger input that causes the output (pin 3) go high. This pin is connected to ground of the circuit i.e. ![]() The 555 timer IC is an integrated circuit (chip) which is used in a variety of timer, delay, pulse generation, and oscillator applications.įigure below shows the input and output signals of the 555 timer as they are arranged around a standard 8 pin dual inline package (DIP).
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