a 68-Pin Ceramic Pin Grid Array [PGA] (G-68) Dimensions shown in inches and (millimeters) 1.012 (25.70) SQ 0.988 (25.10) 0.812 (20.62) SQ 0.788 (20.02) 1.110 (28.19) SQ 1.086 (27.58) 1 A1 CORNER INDEX AREA 2 GUIDE PIN ONLY HEAT SLUG TOP VIEW BOTTOM VIEW (PINS DOWN) 3 4 5 6 7 8 9 10 11 L K J H G F E D C B A 0.164 (4.17) 0.123 (3.12) 0.050 (1.27) TYP SEATING PLANE 0.020 (0.51) 0.018 (0.46) 0.016 (0.41) 0.100 (2.54) TYP 0.050 (1.27) TYP 0.180 (4.57) TYP CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.