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參數資料
| 型號： | 9248YF-95LF |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產生/分配 |
| 英文描述： | 124 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | LEAD FREE ANNEALED, SSOP-48 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 294K |
| 代理商： | 9248YF-95LF |
Integrated
Circuit
Systems, Inc.
General Description
Features
ICS9248-95
310D—04/12/05
Block Diagram
Pentium is a trademark of Intel Corporation
I
2C is a trademark of Philips Corporation
Frequency Generator & Integrated Buffers for PENTIUM/ProTM
Pin Configuration
Up to 124MHz frequency support.
Spread Spectrum for EMI control ±0.5% center
spread and ±0.25% center spread
Serial I
2C interface for Power Management,
Frequency Select, Spread Spectrum.
Provides the following system clocks
- 4-CPUs @ 3.3V, up to 124MHz.
- 13-SDRAMs @3.3V, up to 124MHz
(including SDRAM_F)
- 6-PCI @3.3V, CPU/2 or CPU/3
(including PCICLK_F)
(including 1 free running).
- 1-24MHz @3.3V fixed.
- 1-48MHz @3.3V fixed.
- 2-REF @3.3V, 14.318MHz.
Efficient Power management scheme through PCI
and STOP CLOCKS.
Spread Spectrum ±.25%, & ±.5% center spread
48-Pin SSOP
Power Groups
VDDCPU,GNDCPU=CPUCLK[2:0],CPUCLK_F
VDDSDR, GNDSDR = SDRAMCLKS [11:0], SDRAM_F
VDDPCI, GNDPCI = PCICLKS [4:0], PCICLK_F
VDD48 = 48MHz, 24MHz
VDDREF, GNDREF = REF, X1, X2
* Internal Pull-up Resistor of 240K to VDD
The ICS9248-95 is the single chip clock solution for Desktop
designs using the VIA MVP4 style chipset. 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 ICS9248-95
employs a proprietary closed loop design, which tightly
controls the percentage of spreading over process and
temperature variations.
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