a 484-Ball Plastic Ball Grid Array [PBGA] (B-484) Dimensions shown in millimeters 19.10 19.00 18.90 1.10 BSC 19.10 19.00 18.90 17.05 16.95 16.85 22 20 18 16 14 12 10 8 6 4 2 21 19 17 15 13 11 9 7 5 3 1 A B C D E F G H J K L M N P R T U V W Y AA AB 16.80 BSC SQ 0.80 BSC SQ BALL PITCH 1.10 BSC 17.05 16.95 16.85 19.10 19.00 SQ 18.90 TOP VIEW 2.50 MAX BOTTOM VIEW DETAIL A NOTES: 1. ALL DIMENSIONS ARE IN MILLIMETERS. 2. THE ACTUAL POSITION OF THE BALL GRID IS WITHIN 0.25mm OF ITS IDEAL POSITION RELATIVE TO THE PACKAGE EDGES. 3. THE ACTUAL POSITION OF EACH BALL IS WITHIN 0.10mm OF ITS IDEAL POSITION RELATIVE TO THE BALL GRID. 4. CENTER DIMENSIONS ARE NOMINAL. 1.30 MAX 0.65 0.55 0.45 SEATING PLANE BALL DIAMETER 0.55 0.50 0.45 DETAIL A 0.40 MIN 0.20 MAX