[SI-LIST] : Terminator location with larger BGA's

From: [email protected]
Date: Fri Apr 07 2000 - 13:16:31 PDT

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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
count devices?

Thanks

Bill McGiffin

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• Next message: Vinu Arumugham: "Re: [SI-LIST] : Return path for stripline, two ground planes or o ne power and one ground?"
• Previous message: D. C. Sessions: "Re: [SI-LIST] : Decoupling strategy on 622MHz devices"
• Next in thread: Ron Miller: "RE: [SI-LIST] : Terminator location with larger BGA's"
• Maybe reply: Ron Miller: "RE: [SI-LIST] : Terminator location with larger BGA's"
• Maybe reply: Chris Cheng: "RE: [SI-LIST] : Terminator location with larger BGA's"
• Reply: D. C. Sessions: "Re: [SI-LIST] : Terminator location with larger BGA's"
• Reply: Scott McMorrow: "Re: [SI-LIST] : Terminator location with larger BGA's"

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