I can confirm iTead's minimums as well. I have done several 6mil traces and 10mil drills boards through them.
From the datasheet for the ATmega640/1280/1281/2560/2561In the details for the 100C1 CBGA:Ball diameter: Min: 0.35mm (13.78 mil) Typ: 0.40mm (15.75 mil) Max: 0.45mm (17.72 mil)It doesn't actually give a recommended landing pattern as such, unfortunately, like a lot of other data sheets do, so it's pretty much guesswork what the size should be.16 mil is a good size as it's pretty much the "typical" ball size. 14 mil would be acceptable I guess at a pinch.I wouldn't go below 14 mil - that's just asking for trouble.
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