This input should remain connected to Vcc when IC is not in used. The voltage will be 1.7V lower than the main supply voltage.įor example, if the supply voltage is 5V output high voltage will be 3.3 volts and the output can source or sink up to 200 mA (maximum depends on supply voltage).Ī low voltage (less than 0.7V) is applied to the reset pin that will cause the output (pin 3) to go low.
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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