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參數(shù)資料
| 型號： | ICS9248YF-72LF |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 200.01 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | SSOP-48 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 552K |
| 代理商： | ICS9248YF-72LF |
Integrated
Circuit
Systems, Inc.
General Description
Features
ICS9248-72
Block Diagram
Frequency Timing Generator for PENTIUM II Systems
9248-72 Rev B 7/28/99
Pin Configuration
48-pin SSOP
Up to 200MHz frequency support.
Power Down feature.
Spread Spectrum for EMI control
(0 to 0.5% down spread , + 0.25% center spread)
I2C interface.
VDDL=2.5V,VDD=3.3V
The ICS9248-72 is a main clock synthesizer chip for Pentium
II based systems using Rambus Interface DRAMs. This chip
provides all the clocks required for such a system when used
with a Direct Rambus Clock Generator(DRCG) chip such as
theICS9211-01.
Spread Spectrum may be enabled by driving the SPREAD#
pin active. Spread spectrum typically reduces system EMI by
8dBto10dB.ThissimplifiesEMIqualificationwithoutresorting
to board design iterations or costly shielding. The ICS9248-
72 employs a proprietary closed loop design, which tightly
controls the percentage of spreading over process and
temperature variations.
The CPU/2 clocks are inputs to the DRCG.
Preliminary Product Preview
* 250K ohm pull-up to VDD on indicated inputs.
1.These pins will have 2X drive strength
Key Specification
CPU Output Jitter: <250ps
CPU/2 Output Jitter. <250ps
IOAPIC Output Jitter: <500ps
48MHz, 3V66, PCI Output Jitter: <500ps
Ref Output Jitter. <1000ps
CPU Output Skew: <175ps
IOAPIC Output Skew <250ps
PCI Output Skew: <500ps
3V66 Output Skew <250ps
CPU to 3V66 Output Offset: 0.0 - 1.5ns (CPU leads)
3V66 to PCI Output Offset: 1.5 - 4.0ns (3V66 leads)
CPU to IOAPIC Output Offset 1.5 - 4.0ns (CPU leads)
PRODUCT PREVIEW documents contain information on new
products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change
without notice.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ICS9248YF-73-T | 制造商:ICS 制造商全稱:ICS 功能描述:Frequency Timing Generator for Pentium II Systems |
| ICS9248YF-77 | 制造商:ICS 制造商全稱:ICS 功能描述:Frequency Timing Generator for PENTIUM II Systems |
| ICS9248YF-78 | 制造商:ICS 制造商全稱:ICS 功能描述:Frequency Timing Generator for Pentium II Systems |
| ICS9248YF-80-T | 制造商:ICS 制造商全稱:ICS 功能描述:General Purpose 133MHz System Clock |
| ICS9248YF-81 | 制造商:ICS 制造商全稱:ICS 功能描述:Frequency Generator & Integrated Buffers |
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