Thanks,

That should get me started !

Regards;

Derek




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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