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參數(shù)資料
| 型號： | C9835CY |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Low-EMI Clock Generator for Intel Mobile 133-MHz/3 SO-DIMM Chipset Systems |
| 中文描述： | 低電磁干擾時鐘發(fā)生器英特爾移動133兆赫/ 3的SO - DIMM芯片系統(tǒng) |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 343K |
| 代理商： | C9835CY |
C9835
Document #: 38-07303 Rev. **
Page 15 of 18
Test Measurement Condition
To obtain the maximum accuracy, the total circuit loading
capacitance should be equal to C
XTAL.
This loading capaci-
tance is the effective capacitance across the crystal pins and
includes the clock generating device pin capacitance (C
FTG
),
any circuit trace capacitance (C
PCB
) and any onboard discrete
load capacitance (C
DISC
).
The following formula and schematic illustrates the application
of the loading specification of a crystal (C
) for a design.
C
L
= (C
XINPCB
+ C
XINFTG
+ C
XINDISC
) X (C
XOUTPCB
+ C
XOUTFTG
+ C
XOUTDISC
)
As an example and using a formula for this datasheet
’
s device,
a design that has no disrete 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:
Where:
C
XTAL
= the load rating of the crystal.
C
XOUTFTG
....= the clock generators XIN pin effective device
internal capacitance to ground.
C
XOUTFTG
= the clock generators XOUT pin effective device
internal capacitance to ground.
C
XINPCB
= the effective capacitance to ground of the crystal
to device PCB trace.
C
XOUTPCB
= the effective capacitance to ground of the crystal
to device PCB trace.
C
XINDISC
= any discrete capacitance that is placed between
the X
IN
pin and ground.
C
XOUTDISC
= any discrete capacitance that is placed between
the X
OUT
pin and ground.
Notes:
35. For best performance and accurate frequencies from this device, it is recommended but not mandatory that the chosen crystal meets or exceeds these
specifications.
36. Larger values may cause this device to to exhibit oscillator startup problems.
Table 12. Suggested Oscillator Crystal Parameters
Parameter
F
o
Description
Conditions
Min.
14.17
Typ.
Max.
14.46
Units
MHz
Frequency
14.31818
T
C
T
S
Tolerance
Frequency Stability
Operating Mode
Load Capacitance
Effective Series Resistance (ESR)
Note 35
Stability (T
A
–
10 to +60C)
[35]
Parallel Resonant
[35]
The crystal
’
s rated load
[35]
Note 36
±100
±100
PPM
PPM
C
XTAL
R
ESR
20
40
pF
Ohms
-
-
2.4V
0.4V
3.3V
0V
Tr
Tf
1.5V
3.3V signals
tDC
0.4V
2.0V
1.25V
2.5V
0V
2.5V signals
tDC
Tr
Tf
Probe
Output under Test
Load Cap
-
-
Figure 8.
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| C9835CYT | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Low-EMI Clock Generator for Intel Mobile 133-MHz/3 SO-DIMM Chipset Systems |
| C-983-6 | 功能描述:烙鐵 PLUS SOLDERING TIP60 RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included |
| C-983-7 | 功能描述:烙鐵 PLUS SOLDERING TIP70 RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included |
| C-983-7.5 | 功能描述:烙鐵 PLUS SOLDERING TIP75 RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included |
| C-983-8 | 功能描述:烙鐵 PLUS SOLDERING TIP80 RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included |
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