K25C81-FB Semtech, K25C81-FB Datasheet - Page 9

• Manufacturer Part Number: K25C81-FB
• Description: Versatile PC/XC/AT/PS/2 Compatible Keyboard Encoder
• Manufacturer: Semtech

Copyright Semtech, 1997-2001
DOC5-C81-DS-105
MECHANICALS FOR THE K25C81-FN
(Note 1)
44
C
0.25 (0.010)
+
Z
G1
M
T
(Note 1) 44
G
L
L
S
-
M
S
+
P
N
S
-
P
Leads
Detail S
PLCC
S
A
R
44
J
E
0.18 (0.007)
0.18 (0.007)
9
1
N
T
0.010 (0.004)
Seating Plane
M
M
T
T
L
L
V
S
S
-
-
M
M
M
S
S
Y BRK
N
N
W
Notes:
S
S
-
-
1. Due to space limitation, the chip
2. Datums L, M, N, and P determine where
3. DIM G1, true position to be measured
4. DIM R and U do not include mold
5. Dimensioning and tolerancing per Ansi
6. Controlling dimension: Inch
P
P
S
S
is represented by a general (smaller)
case outline drawing rather than
showing all 44 leads.
the top of the lead shoulder exits plastic
body at mold parting line
at Datum T, Seating Plane
protusion. Allowable mold protusion is
0.25 (0.010) per side.
Y14.5M, 1982
K1
K
D
D
Detail S
View D-D
Z1
B
F
H
0.18 (0.007)
X
0.18 (0.007)
0.18 (0.007)
0.18 (0.007)
0.18 (0.007)
U
www.semtech.com
M
T
0.18 (0.007)
DIM
M
M
M
M
0.25 (0.010)
G
H
K
W
G1
K1
Z1
A
B
C
E
F
J
R
U
V
X
Y
Z
N
T
T
T
T
S
MILLIMETERS
17.40 17.65 0.685 0.695
17.40 17.65 0.685 0.695
16.51 16.66 0.650 0.656
16.51 16.66 0.650 0.656
15.50 16.00 0.610 0.630
4.20
2.29
0.33
0.66 0.81
0.51
0.64
1.07
1.07
1.07
1.02
N
N
MIN MAX MIN MAX
L
L
-
2
1.27 BSC
-
2
P
S
S
0
S
S
0
S
-
-
-
-
P
P
M
M
M
G1
L
M
4.57 0.165 0.180
2.79 0.090 0.110
0.48 0.013 0.019
1.21 0.042 0.048
1.21 0.042 0.048
1.42 0.042 0.056
0.50
S
S
10
10
S
S
-
-
T
-
S
T
N
L
N
L
-
0
0
N
M
N
S
S
S
S
S
S
0.026 0.032
0.020
0.025
0.040
-
-
-
-
S
0.050 BSC
2
-
P
M
P
M
-
2
Note 1
P
INCHES
-
0
S
S
S
S
P
S
S
0.020
L
10
10
L
-
-
-
S
S
0
0
-
M
-
M
S
S