Need help with BGA footprint

[omdatov]

Hello,
Can anybody tell me when I would make the footprint of a BGA component and in the datasheet the give me three value about the diameter of the ball, it means 0.4 , 0.45 and 0.5
the min , typical and the max so which value should I take ??
Thanx

 

[55pilot]

Both Xilinx and TI have excellent application notes about BGA footprints and a lot of related design issues. Search their websites.

 

[omdatov]

thanx 55pilot for your help