You can see the ne555 pinout diagram below.

The power connections to the chip are through pins 1. Finally, pin 7 has an external capacitor that works with the resistor to control the timing intervals. 1.Fig 1 shows the pin connections to the 555 timer, it was take directly from the 555 timer datasheet. The 555 timer was introduced over 40 years ago. Pin 5 is the control voltage pin connected to the environment through the use of a small capacitor-the capacitor levels out any fluctuations that might affect how the timer operates. A complete tutorial of 555 Timer IC with its block diagram, working of SE/NE 555 Timer,Pin Configuration and pin out diagram, Download 555 data sheet. It is made with bipolar and CMOS types with low power material. Pin 1 is the ground pin that connects the chip to the ground. Pin Description 555 Timer Pinout IC Developed by Signetics, an American company Timer 555 is used widely in digital circuits due to its cost effectiveness, low price, easy to implementation with stable function called stability. NE555 has eight different pins, and each has other functions. The following are the key application areas for the ne555 chip: Operating temperature o to 70 degrees Celsius.Power consumption(minimum operating) 15V.According to its datasheet, some of the main specs of the ne555 chip are:

Download 555 timer pinout