This is a common 555 timer/oscillator from TI. A classic for all of those first year circuits projects where you need to blink an LED, generate tone, and thousands of other great beginning projects. Google around for a huge list of resources and example projects.
- Adjustable duty cycle
- Astable or monostable operation
- Sink or source up to 200mA
- Supply Voltage range: 4.5-16V
- Timing from microseconds to hours
- TTL compatible output