- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379723 > C9835CTT (Cypress Semiconductor Corp.) Low-EMI Clock Generator for Intel Mobile 133-MHz/3 SO-DIMM Chipset Systems PDF資料下載
參數(shù)資料
| 型號(hào)： | C9835CTT |
| 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(shí)鐘發(fā)生器英特爾移動(dòng)133兆赫/ 3的SO - DIMM芯片系統(tǒng) |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 343K |
| 代理商： | C9835CTT |
C9835
Document #: 38-07303 Rev. **
Page 9 of 18
Byte 4: VCH Clock Register (1 = Enable, 0 = Disable)
@Pup
[
17
]
Pin#
[
18
]
SMBus Test Circuitry
Spread Spectrum Clock Generation (SSCG)
Spread Spectrum is a modulation technique applied here for
maximum efficiency in minimizing EMI radiation generated by
repetitive digital signals, mainly clocks. A clock accumulates
EM energy at the center frequency it is generating. Spread
Spectrum distributes this energy over a small frequency
bandwidth therefore distributing an even amount of energy
over a wider spectrum. This technique is achieved by
modulating the clock either down or around the center (see
Figure 7
below) of its resting frequency by a certain
percentage (which also determines the energy distribution
bandwidth). In this device, Spread Spectrum is enabled by
setting SMBUS Byte0,Bit3 = 1. The default of the device at
Notes:
17. The @Pup column gives the default state at power-up
18. The Pin# column lists the relevant pin number where applicable.
power up keeps the Spread Spectrum disabled, it is therefore,
important to have SMBUS accessibility to turn-on the Spread
Spectrum function. Once the Spread Spectrum is enabled, the
spread bandwidth option is selected by SST(0:2) in SMBUS
Byte 5, bits 5, 6, and 7 . See
Table 7
below.
In Down Spread mode the center frequency is shifted down
from its rested (non-spread) value by
of the total spread %
(e.g., assuming the center frequency is 100 MHz in
non-spread mode; when down spread of
–
0.5% is enabled,
the center frequency shifts to 99.75 MHz.). In Center Spread
Mode, the center frequency remains the same as in
non-spread mode.
Bit
Description
7
0
36
VCH_CLK SSC Mode Enable
“
0
”
= 48 MHZ (non-SSCG)
“
1
”
= 66.6 MHz (SSCG applicable when Byte 0,Bit3 = 1)
Reserved. Set to 0
Reserved. Set to 0
Reserved. Set to 0
Reserved. Set to 0
Reserved. Set to 0
Reserved. Set to 0
Reserved. Set to 0
6
5
4
3
2
1
0
0
0
0
0
0
0
0
–
–
–
–
–
–
–
Byte 5: SSCG Control Register (1 = Enable, 0 = Disable)
@Pup
[17]
Pin#
[
18
]
7
0
–
6
0
–
5
0
–
4
0
–
3
0
–
2
0
–
1
0
–
0
0
–
Bit
Description
Spread Mode (0 = down, 1 = center)
Selects spread bandwidth. See
Table 5
.
Selects spread bandwidth. See
Table 5
.
Reserved. Set to 0
Reserved. Set to 0
Reserved. Set to 0
ESEL1 Expanded Freq. Selection MSB, See
Table 2
.
ESEL0 Expanded Freq. Selection LSB, See
Table 2
.
2.2 K
Device under
SDATA
DATAIN
SCLK
DATAOU
CLOCK
+ 5V
+ 5V
+ 5V
2.2 K
2.2 K
Figure 6. SMBUS Test Circuitry
[19]
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| C9835CY | Low-EMI Clock Generator for Intel Mobile 133-MHz/3 SO-DIMM Chipset Systems |
| C9835CYT | Low-EMI Clock Generator for Intel Mobile 133-MHz/3 SO-DIMM Chipset Systems |
| C9851 | Clock Generator for Pentium III Server and Workstation Applications |
| C9851BT | Clock Generator for Pentium III Server and Workstation Applications |
| C9851BY | LED GREEN HIGHBRIGHTNESS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| C9835CY | 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 |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。