7.1.1 Mechanical Dimensions of the 255 CBGA Package
Figu re 15 provides th e m ech an ical dim en sion s an d bottom su rface n om en clatu re of
th e BGA package.
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. DIMENSIONS IN MILLIMETERS.
2X
3. TOP SIDE A1 CORNER INDEX IS A METALIZED
0.2
FEATURE WITH VARIOUS SHAPES. BOTTOM SIDE A1
CORNER IS DESIGNATED WITH A BALL MISSING
D
A
FROM THE ARRAY.
A1 CORNER
MILLIMETERS
DIM MIN
MAX
3.00
1.00
1.10
0.93
A
A1
A2
b
2.45
0.80
0.90
0.82
D
21.00 BSC
D1
e
E
5.00
16.00
1.27 BSC
21.00 BSC
5.00 16.00
E
E1
E1
C
2X
0.2
0.15 C
D1
B
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
T
R
P
N
M
L
K
J
e/2
H
G
F
E
D
C
B
A
e
e/2
255X
b
A2
A1
0.3 C A B
C
0.15
A
Figure 15. Mechanical Dimensions and Bottom Surface Nomenclature of the 255 CBGA
Package
29 of 44
PPC740 and PPC750 Hardware Specifications
Preliminary and subject to change without notice
IBM [ IBM ]
