can i get operation of 555 timer.can i have any pdf's files of it

 

Here.

http://www.ortodoxism.ro/datasheets/nationalsemiconductor/DS007851.PDF

 

Google is your friend ... http://www.google.com/search?hl=en&q=%2B%22555+timer%22+%2B%22operation%22

The first listing should satisfy your quest for knowledge on the 555.

 

http://www.uoguelph.ca/~antoon/gadgets/555/555.html