Datasheet > ICS9248-73

ICS9248-73

更新时间： 2024-11-10 22:55:27

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
15页	357K
描述
Frequency Timing Generator for Pentium II Systems

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数据手册

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ICS9248-73 数据手册

Integrated

Circuit

Systems, Inc.

ICS9248-73

Frequency Timing Generator for Pentium II Systems

General Description

The ICS9248-73 is a single chip clock for Intel Pentium II.

Features

Generates the following system clocks:

- 2 - CPUs @ 2.5V , up to 150MHz.

-1-IOAPIC@2.5V, PCI/2MHz.

- 9 - SDRAMs @ 3.3V, up to 150MHz.

-2-3V66@3.3V,2xPCIMHz.

-8-PCIs@3.3V.

-2-48MHz, @3.3Vfixed.

It provides all necessary clock signals for such a system.

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 ICS9248-73

employs a proprietary closed loop design, which tightly

controls the percentage of spreading over process and

temperature variations.

-1-REF@3.3V,14.318MHz.

-1-24_48MHz, @3.3Vfixed.

Supports spread spectrum modulation ,

down spread 0 to -0.5%, ±0.25% center spread.

I²C support for power management

Efficient power management scheme through PD#

Uses external 14.138 MHz crystal

Block Diagram

Pin Configuration

48-Pin 300 mil SSOP

*120K ohm pull-up to VDD on indicated inputs.

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

1. These pins will have 2x drive strength

Power Groups

GNDREF,VDDREF =REF&Crystal

GND3V66,VDD3V66 =3V66

GNDPCI,VDDPCI=PCICLK

GNDCOR,VDDCOR=PLLcore

GND48,VDD48 =48MHz

GNDSDR,VDDSDR=SDRAM

GNDLCPU,VDDLCPU=CPUCLK

GNDAPIC,VDDAPIC=IOAPIC

PentiumII is a trademark of Intel Corporation

I²C 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

9248-73 Rev B 2/10/00

information being relied upon by the customer is current and accurate.

12 3 4 5 6 7...15

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