參數(shù)資料
型號(hào): C9815DY
英文描述: Up to 5A ULDO linear regulator
中文描述: CPU系統(tǒng)時(shí)鐘發(fā)生器| SSOP封裝| 56PIN |塑料
文件頁(yè)數(shù): 17/19頁(yè)
文件大?。?/td> 328K
代理商: C9815DY
Low EMI Clock Generator for Intel
133MHz/2DIMM Chipset Systems
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07054 Rev. **
05/03/2001
Page 17 of 19
APPROVED PRODUCT
C9815
Suggested Oscillator Crystal Parameters (Cont.)
As an example, and using this formula for this datasheet
s device, a design that has no discrete loading capacitors
(C
DISC
) and each of the crystal to device PCB traces has a capacitance (C
PCB
) to ground of 4pF (typical value) would
calculate as:
C
L
= (4pF + 36pF
+ 0pF) X (4pF + 36pF
+ 0pF) = 40 X 40 = 1600 = 20pF
(4pF + 36pF
+ 0pF) + (4pF + 36pF
+ 0pF) 40 + 40 80
Therefore to obtain output frequencies that are as close to this data sheets specified values as possible, in this design
example, you should specify a parallel cut crystal that is designed to work into a load of 20pF.
Package Drawing and Dimensions
56 Pin SSOP Outline Dimensions
INCHES
MILLIMETERS
SYMBOL
MIN
NOM
MAX
MIN
NOM
MAX
A
0.095
0.102
0.110
2.41
2.59
2.79
A
1
0.008
0.012
0.016
0.203
0.305
0.406
A2
0.088
-
0.092
2.24
-
2.34
B
0.008
-
0.0135
0.203
-
0.343
C
0.005
-
0.010
0.127
-
0.254
D
0.720
0.725
0.730
18.29
18.42
18.54
E
0.291
0.295
0.299
7.39
7.49
7.60
e
0.025 BSC
0.635 BSC
H
0.395
-
0.420
10.03
-
10.67
L
0.020
-
0.040
0.508
-
1.016
a
0
o
-
8
o
0
o
-
8
o
B
e
A
A
1
A
2
E
a
L
C
D
H
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