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參數(shù)資料
| 型號： | 9248YF-195LF-T |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 140 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | 0.300 INCH, LEAD FREE, MO-118, SSOP-48 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 158K |
| 代理商： | 9248YF-195LF-T |
3
ICS9248-195
0375E—12/15/08
Byte0: Functionality and Frequency Select Register (default = 0)
Serial Configuration Command Bitmap
Notes:
1, Default at Power-up will be for latched logic inputs to define frequency. Bit [2, 6:4] are default to 0011.
2, PWD = Power-Up Default
The ICS9248-195 is the single chip clock solution for Notebook designs using the 440BX, MX, VIA PM/PL/PLE 133
style chip set, with Coppermine or Tualatin processor, for Note book applications. It provides all necessary clock signals
for such a system.
Spread spectrum may be enabled through I
2C programming. Spread spectrum typically reduces system EMI by 8dB
to 10dB.This simplifies EMI qualification without resorting to board design iterations or costly shielding.The ICS9248-
195 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and
temperature variations.
General Description
Bit
PWD
FS3
Bit2
FS2
Bit6
FS1
Bit5
FS0
Bit4
CPUCLK
PCICLK
Center
Spread %
Down
Spread%
0
66.67
33.33
±0.35%
-0.70%
0
1
100.00
33.33
±0.35%
-0.70%
0
1
0
66.67
33.33
±0.60%
-1.20%
0
1
133.33
33.33
±0.35%
-0.70%
0
1
0
66.67
33.33
±0.23%
-0.45%
0
1
0
1
100.00
33.33
±0.23%
-0.45%
0
1
0
100.00
33.33
±0.60%
-1.20%
0
1
133.33
33.33
±0.23%
-0.45%
1
0
66.67
33.33
±0.45%
-0.90%
1
0
1
100.00
33.33
±0.45%
-0.90%
1
0
1
0
90.00
30.00
±0.35%
-0.70%
1
0
1
133.33
33.33
±0.45%
-0.90%
1
0
70.00
35.00
±0.35%
-0.70%
1
0
1
105.00
35.00
±0.35%
-0.70%
1
0
133.33
33.33
±0.60%
-1.20%
1
140.00
35.00
±0.35%
-0.70%
0 - Normal
Note1
0011
Description
1
0
1
0 = Center Spread Spectrum Modulation
1 = Down Spread Spectrum Modulation
0 - Frequency is selected by hardware select pins. Latched inputs.
1 - Frequency is controlled by I
2C programming.
0 - Running
1 - Tristate all outputs
0
1 - Spread Spectrum Enabled
Bit 0
Bit 7
Bit 3
Bit 2,
6:4
Bit 1
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