Pin 1 (GND) – ground, usually connected to the circuit common ground.
Pin 2 (Trigger) – This pin is the trigger to start it NE555 period of time. Trigger signal on the edge of the voltage must be greater than 2 / 3 VCC, the lower edge shall be less than 1 / 3 VCC.
Pin 3 (output) – When the time period began 555 output the output pins to move less than the supply voltage of 1.7 volts of high potential. End of a cycle back to O volts output of the low potential. High potential around the time of maximum output current of 200 mA.
Pin 4 (Reset) – sent to a low logic potential of this pin will reset the timer and when the output back to a low potential. It is often not receiving the positive supply or ignored.
Pin 5 (Control Voltage) – to allow the pin voltage changes by external trigger and gate threshold voltage. When the timer is operating in a stable or oscillating mode of operation, this input can be used to change or adjust the output frequency.
Pin 6 ( Threshold) – Pin 6 output was low and to reset the lock state. When the pin voltage from 1 / 3 VCC voltage of the following go to 2 / 3 VCC above start this action.
Pin 7 (Discharge) – The main output pins and pin have the same current output capacity, when the output is ON when LOW, a low impedance to ground, when the output is OFF HIGH, high impedance to ground.
Pin 8 (Vcc) – This is a 555 timer IC’s positive power supply voltage.
Source: http://www.partsparty.com/index.php/pin-configuration-of-ne555/
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