K25C81-FB Datasheet, PDF (9/12 Pages) Semtech Corporation – Versatile PC/XC/AT/PS/2 Compatible Keyboard Encoder

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