The LM555 timer comprises of 8-pins and function of the each pin are discussed below
555 Timer IC Pin Configuration
Pin1 is a GND pin
Pin2 is a trigger pin, which is liable
for conversion of the flip flop from set to reset. The timer’s o/p
depending on the external trigger pulse amplitude which is applied to
this trigger pin.
Pin3 is the output pin.
Pin4 is the reset pin. When the
negative pulse is applied to this pin to reset the timer or disable, and
false triggering can be avoided by connecting this pin to VCC.
Pin5 is the control voltage pin, this
pin controls the trigger and threshold levels. This pin controls the
pulse width of the o/p waveform. When an external voltage is applied,
then the o/p waveform will be modulated.
Pin6 is the threshold pin, when the
voltage is applied to this pin, then it compares with a reference
voltage. The amplitude of this pin is responsible for the flip flop’s
set state.
Pin7 is the discharge pin, when the
open collector o/p discharges a capacitor among the intervals, then it
toggles the o/p from high to low.
Pin8 is the V+ pin which is used to supply the voltage with respect to GND terminal.
