[SI-LIST] Re: Bond Wire Length
- From: Neeraj Pendse <cnepsc@xxxxxxxxxxxxxxx>
- To: NS121846@xxxxxxxxxxxxxxxxxxxxxxxxxxx
- Date: Fri, 17 Aug 2001 15:51:53 -0700
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.
>
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