- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366628 > C9811X2AYB Up to 5A ULDO linear regulator PDF資料下載
參數(shù)資料
| 型號： | C9811X2AYB |
| 英文描述： | Up to 5A ULDO linear regulator |
| 中文描述： | CPU系統(tǒng)時鐘發(fā)生器| SSOP封裝| 56PIN |塑料 |
| 文件頁數(shù)： | 9/17頁 |
| 文件大小： | 232K |
| 代理商： | C9811X2AYB |
Low EMI Clock Generator for Intel
810 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#: 38-07052 Rev. **
05/03/2001
Page 9 of 17
APPROVED PRODUCT
C9811x2
Spread Spectrum Clock Generation (SSCG)
Spread Spectrum is a modulation technique applied here for maximum efficiency in minimizing Electro-Magnetic
Interference radiation generated from 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
spreading the same amount of energy over a spectrum. This technique is achieved by modulating the clock down from
(Fig.9A) or around the center (Fig.9B) 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 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 & 7 following tables 4A, and 4B below.
In Down Spread mode the center frequency is shifted down from its rested (non-spread) value by
of the total spread
%. (ex.: assuming the center frequency is 100MHz in non-spread mode; when down spread of
–
0.5% is enabled, the
center frequency shifts to 99.75MHz.).
In Center Spread mode, the Center frequency remains the same as in the non-spread mode.
Down Spread
Center Spread
Fig.9A
Fig.9B
Spread Spectrum Selection Tables
I2C BYTE5
Bit[7:5]
100
101
110
111
Table 4A
Center Frequency
(MHz)
66/100
66/100
66/100
66/100
Spread
%
±
0.25
±
0.35
±
0.5
±
0.7
I2C BYTE5
Bit[7:5]
000
001
010
011
Table 4B
Center Frequency
(MHz)
66/100
66/100
66/100
66/100
Spread
%
- 0.5
- 0.7
- 1.0
- 1.5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| C9812DYB | Up to 5A ULDO linear regulator |
| C9815DY | Up to 5A ULDO linear regulator |
| C9821GQ | Up to 5A ULDO linear regulator |
| C9822EQ | Up to 5A ULDO linear regulator |
| C9827JT | Up to 5A ULDO linear regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| C9812 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Low EMI Clock Generator for Intel 810E Chipset Systems |
| C9812DYB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU SYSTEM CLOCK GENERATOR|SSOP|56PIN|PLASTIC |
| C98130-A1231-C30 | 制造商:Siemens 功能描述: |
| C9815DY | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU SYSTEM CLOCK GENERATOR|SSOP|56PIN|PLASTIC |
| C981FFN-CTN | 制造商:Thomas & Betts 功能描述:1" FSC 1-GANG WP BOX 18 CU IN-CAN |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。