Derek Here's a few guidelines
- Keep via pattern on your routing grid
- If device uses local fiducials (fine pitch devices) make sure they're in place
prior to putting in pattern.
- Keep fan-out traces (stringers) .008 min.
Fine pitch traces keep .003 smaller than pad size
- Keep fanout pads .040 min. from component largest feature (pad or comp. body)
(if possible, for testability)
- Make sure you don't connect pad 2 to pin 3 (depends on type of software)
- Keep gnd inside of pattern and pwr on outside (depends on where caps are)
Hard to give example with limited keys;
1 --- = 2
/ <--- routing channel
=--/
3 --- = 4
/ <--- routing channel
=--/
^ ^ ^ ^ ^
| | | | |______ pad (via)
| | | |________ trace
| | |___________ smt pad
| |______________ trace
|_________________ pad
Michael Kuczynski Librarian/Sr. Designer
Allied Signal 201-393-2122 (Phone)
699 Rt46E E/K4 201-393-2357 (Fax)
Teterboro NJ 07608
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