Playing with the electrical grid so that it's 125% of the regular grid works great
for me.  I always seem to catch the center of the pins this way even when I have an
Imperial grid board with these metric TQFPs.

____________
Brian Guralnick


----- Original Message -----
From: "Jon Elson" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Friday, September 07, 2001 3:17 PM
Subject: Re: [PEDA] Altera 144Pin TQFP Landing Pattern


|
|
| [EMAIL PROTECTED] wrote:
|
| > All,
| > Thanks for responding.  It looks like I have several paths to explore.
| >
| > 1. I was able to get IPC's website footprint generation tool to spit out a
| > footprint.
| > 2. Brian Gurlanick's QFP generator.
| > 3. Michael Scmitt provided a footprint he uses for the Altera part I'm using.
| >
| > I have an additional question.  It looks like QFP footprints generally are
| > created with metric grids.  Will I run into trouble when I use metric
| > footprints on an imperial grid board?
|
| The autorouter (and sometimes manual routeing, too) has a problem
| when there are many different grids on the same board.  It doesn't cause
| any specific problem with a metric/imperial grid, just that they are different.
|
| Jon
|
|

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