音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

ICS9248YF-81 Datasheet

  • ICS9248YF-81

  • Frequency Generator & Integrated Buffers

  • 544.11KB

  • 18頁

  • ICS

掃碼查看芯片數(shù)據(jù)手冊

上傳產(chǎn)品規(guī)格書

PDF預(yù)覽

Integrated
Circuit
Systems, Inc.
ICS9248- 81
Frequency Generator & Integrated Buffers
General Description
The
ICS9248-81
is the single chip clock solution for Desktop/
Notebook designs using the SIS style chipset. It provides all
necessary clock signals for such a system.
Spread spectrum may be enabled through I
2
C 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
ICS9248-81
employs a proprietary closed loop design, which tightly
controls the percentage of spreading over process and
temperature variations.
Serial programming I
2
C interface allows changing functions,
stop clock programming and frequency selection. The SD_SEL
latched input allows the SDRAM frequency to follow the
CPUCLK frequency(SD_SEL=1) or other clock frequencies
(SD_SEL=0)
Features
聲
Generates the following system clocks:
- 3 CPU(2.5V/3.3V) up to 133.3MHz.
- 6 PCI(3.3V) (including 1 free-running)
- 13 SDRAMs(3.3V) up to 133.3MHz.
- 3 REF (3.3V) @ 14.318MHz
- 1 clock @ 24/14.3 MHz selectable output for SIO
- 1 Fixed clock at 48MHz (3.3V)
- 1 IOAPIC @ 2.5V / 3.3V
Skew characteristics:
- CPU 聳 CPU<175ps
- SDRAM 聳 SDRAM < 250ps
- CPU聳SDRAM < 500ps
- CPU(early) 聳 PCI : 1-4ns (typ. 3ns)
- PCI 聳 PCI <500ps
Supports Spread Spectrum modulation 鹵0.25 & 鹵0.5%
center spread
Serial I
2
C interface for Power Management, Frequency
Select, Spread Spectrum.
Efficient Power management scheme through PCI,
SDRAM, CPU STOP CLOCKS and PD#.
Uses external 14.318MHz crystal
48 pin 300mil SSOP.
聲
聲
聲
聲
聲
聲
Block Diagram
Pin Configuration
Power Groups
VDDREF = REF [2:0], X1, X2
VDDPCI = PCICLK_F, PCICLK [4:0]
VDDSD/C = SDRAM [11:0], supply for PLL core, 24 MHz, 48MHz
VDD/CPU = CPUCLK [3:1]
VDDLAPIC = IOAPIC
GNDFIX = Ground for fixed clock PLL and output buffers
9248-81 Rev E 10/12/99
48-Pin SSOP
* Internal Pull-up Resistor of
120K to 3.3V on indicated inputs
Pentium is a trademark of Intel Corporation
I
2
C is a trademark of Philips Corporation
ICS reserves the right to make changes in the device data identified in
this publication without further notice. ICS advises its customers to
obtain the latest version of all device data to verify that any
information being relied upon by the customer is current and accurate.

ICS9248YF-81相關(guān)型號PDF文件下載

您可能感興趣的PDF文件資料

熱門IC型號推薦

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務(wù)：
賣家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時間周一至周五
9:00-17:30

關(guān)注官方微信號，
第一時間獲取資訊。

建議反饋
返回頂部

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務(wù)的動力！意見一經(jīng)采納，將有感恩紅包奉上哦！