The 555 is a monolithic timing circuit that can produce accurate and highly stable time delays or oscillations. It is one of the most versatile linear integrated circuits. Signetics Corporation first introduced this device as the SE/NE 555 in early 1970. The 555 timer basically operates in one of he two modes either as Monostable (one-shot) multivibrator or as an Astable (free running) multivibrator. The device is available as an 8 pin metal can, an 8 pin mini DIP or a 14 pin DIP. The SE555 is designed for the operating temperature range from -55 to +125 degree Celsius, while the NE555 operates over a temperature range of 0 to +70 degree Celsius.
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