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參數資料
| 型號： | W27C257 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 32K×8bit Electrically Eresable EPROM(32K×8位電可擦除EPROM) |
| 中文描述： | 32K的電Eresable × 8位存儲器（32K的× 8位電可擦除存儲器） |
| 文件頁數： | 13/14頁 |
| 文件大小： | 152K |
| 代理商： | W27C257 |
W27C257
Publication Release Date: September 1998
- 13 -
Revision A2
PACKAGE DIMENSIONS
28-pin P-DIP
Seating Plane
1. Dimensions D Max. & S include mold flash or
2. Dimension E1 does not include interlead flash.
3. Dimensions D & E1 include mold mismatch and
4. Dimension B1 does not include dambar
5. Controlling dimension: Inches.
6. General appearance spec. should be based on
1.63
1.47
0.064
0.058
Notes:
Symbol
Min. Nom. Max.
Max.
Nom.
Min.
Dimension in Inches
Dimension in mm
A
A
A
B
B
1
c
D
E
E
1
e
L
a
A
S
1
2
0.060
1.52
0.210
5.33
0.010
0.150
0.016
0.155
0.018
0.160
0.022
3.81
0.41
0.25
3.94
0.46
4.06
0.56
0.008
0.120
0.670
0.010
0.130
0.014
0.140
0.20
3.05
0.25
3.30
0.36
3.56
0.540
0.550
0.545
13.72
13.97
13.84
17.02
15.24
14.99
15.49
0.600
0.590
0.610
2.29
2.54
2.79
0.090
0.100
0.110
1
e
1.460
1.470
37.08
37.34
0
15
0.090
2.29
0.650
0.630
16.00
16.51
15
0
e
A
2
A
a
c
E
Base Plane
1
A
1
e
L
A
S
1
E
D
1
B
B
28
1
15
14
32-pin PLCC
L
c
1
b
2
A
H
E
E
e
b
D H
D
y
A
A
1
Seating Plane
E
G
G
D
1
13
14
20
29
32
4
5
21
30
Notes:
1. Dimension D & E do not include interlead flash.
2. Dimension b does not include dambar protrusion/intrusion.
3. Controlling dimension: Inches.
4. General appearance spec. should be based on final visual
inspection spec.
Symbol
Min.
Nom.
Max.
Max.
Nom.
Min.
Dimension in Inches
Dimension in mm
A
A
A
b
1
b
c
D
E
e
G
D
G
E
H
E
L
y
θ
1
2
3.56
0.50
2.80
2.67
2.93
0.71
0.66
0.81
0.41
0.46
0.56
0.20
0.25
0.35
13.89
13.97
14.05
11.35
11.43
11.51
1.27
H
D
12.45
12.95
13.46
9.91
10.41
10.92
14.86
14.99
15.11
12.32
12.45
12.57
1.91
2.29
0.004
0.095
0.090
0.075
0.495
0.490
0.485
0.595
0.590
0.585
0.430
0.410
0.390
0.530
0.510
0.490
0.050
0.453
0.450
0.447
0.553
0.550
0.547
0.014
0.010
0.008
0.022
0.018
0.016
0.032
0.026
0.028
0.115
0.105
0.110
0.020
0.140
1.12
1.42
0.044
0.056
0
°
10
°
10
°
0
°
0.10
2.41
θ
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