N555 Precision Timer IC is a precision timing circuit capable of producing accurate time delays or oscillation. In the time-delay or mono-stable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the a-stable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor.

Quick View of LM555 Timer IC:
Input voltage : 5V.
Output: ~5V @200mA.
Timing From Microseconds to Hours.
Astable or Monostable Operation.
Adjustable Duty Cycle.
TTL-Compatible Output Can Sink or Source Up to 200 mA.