Date: Fri Apr 07 2000 - 13:16:31 PDT
We are using some 484 pin BGA's (FPGA's), which have edge rates of about 170ps.
Using a series termination, it would have to be placed within 1/10 of the
transition length according to Howard Johnson. On FR4, the transition length
would be .98, making the distance from source to termination .098. It is not
possible to get all of the required termination's within that distance.
Aside from slowing down the edges (not desirable), waiting longer for things to
settle, or going with buried resistance, are there any other solutions for
placement of termination's? How are other people terminating large, high pin
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