Hey Norm, For a 35 mm square, with only two rings around the die, I would think you are looking at, approximately: Signal: 3.50 mm (+0.5/-1 mm) Inner ring: 1.25 mm (+0.25/-0.25 mm) Outer ring: 2.00 mm (+/- 0.25 mm) Numbers change with the chip size, the above number should be okay for something like an 8 mm sq. chip. Hope this information helps! Regards, - Neeraj. National Semiconductor Corporation 2900 Semiconductor Drive, Mail Stop 19-100 Santa Clara, California, 95051 http://www.national.com/ NYSE:NSM "Smith, Norm W" wrote: > Neeraj, > > Here's what I know about this BGA: > > MBGA means metal BGA. > Size of BGA=35mm square, 1mm pitch on balls. > There is one ground plane and one signal layer, with a power and ground > ring. > There are 588 pads, but we don't know the die size yet - trying to find out. > > Thanks, Norm > > ---------------------------------------------------------------------------- > --- > > Norm, > > I want to say the wire lengths going to signal balls should be about 4.5 > (+1/-2) mm. I could give you some ball-park numbers if you answer the > follwing > qustions: > > 1. By MBGA you mean molded BGA, right? > 2. What's the body size of the BGA and the die size? > > It would also help if you can give me the following information > 1. Do you know if there are any power planes/and power rings? > > Regards, > > - Neeraj. > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu