Datasheet > ICS9250-10

ICS9250-10

更新时间： 2024-11-12 22:55:27

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
16页	668K
描述
Frequency Timing Generator for Pentium II Systems

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ICS9250-10 数据手册

ICS9250-10

Integrated

Circuit

Systems, Inc.

Preliminary Product Preview

Frequency Timing Generator for Pentium II Systems

General Description

The ICS9250-10 is a single chip clock for Intel Pentium II.

Features

Generates the following system clocks:

-3CPU(2.5V)66.6/100MHz(upto133MHzthrough

It provides all necessary clock signals for such a system.

I²C selection)

- 9SDRAM(3.3V)upto133MHz

-8PCI(3.3V)@33.3MHz

-2IOAPIC(2.5V)@16.67or33.3MHz

- 2Hublinkclocks(3.3V)@66.6MHz

- 2 USB (3.3V) @ 48 MHz ( Non spread spectrum)

- 1REF(3.3V)@14.318MHz

Spread spectrum may be enabled through I²C programming.

Spread spectrum typically reduces EMI by 8dB to 10 dB.

This simplifies EMI qualification without resorting to board

design iterations or costly shielding. The ICS9250-10

employs a proprietary closed loop design, which tightly

controls the percentage of spreading over process and

temperature variations.

Supports spread spectrum modulation ,

down spread 0 to -0.5%

I²C support for power management

Efficient power management scheme through PD#

Uses external 14.138 MHz crystal

Block Diagram

Pin Configuration

56-Pin 300 mil SSOP

*60K ohm pull-up to VDD on indicated inputs.

Power Groups

VDD0, GND0=REF&Crystal

VDD1,GND1=3V66[1:0]

VDD2,GND2=PCICLK[7:0]

VDD3,GND3=PLLcore

VDD4,GND4= 48MHz[1:0]

VDD5,GND5 =SDRAM_F,SDRAM[7:0]

VDDL0,GNDL0=CPUCLK[2:0]

VDDL1,GNDL1=IOAPIC[1:0]

Pentium II is a trademark of Intel Corporation

I²C is a trademark of Philips Corporation

9250-10 Rev J 6/15/99

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.

12 3 4 5 6 7...16

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