Datasheet > ICS9248-107

ICS9248-107

更新时间： 2024-09-28 22:11:03

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
14页	142K
描述
Frequency Timing Generator for PENTIUM II Systems

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中文翻译

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ICS9248-107 数据手册

Integrated

Circuit

Systems, Inc.

ICS9248-107

Frequency Timing Generator for PENTIUM II Systems

RecommendedApplication:

Pin Configuration

RCC chipset

GNDREF

REF0

*SEL24_48#/REF1

VDDREF

VDDLAPIC

IOAPIC0

IOAPIC1

GNDLAPIC

IOAPIC2

VDDLCPU

CPUCLK0

GNDLCPU

CPUCLK1

VDDLCPU

CPUCLK2

CPUCLK3

GNDLCPU

VDD66

OutputFeatures:

•

4 - CPUs @ 2.5V, up to 180MHz.

GNDPCI

3-IOAPIC@2.5V

3-3V66MHz@3.3V.

11-PCIs@3.3V

*FS0/PCICLK_F

*FS1/PCICLK1

VDDPCI

*FS2/PCICLK2

*FS3/PCICLK3

GNDPCI

1-48MHz,@3.3Vfixed

1-24/48MHz,@3.3V

PCICLK4

PCICLK5

VDDPCI

PCICLK6

PCICLK7

GNDPCI

PCICLK8

PCICLK9

PCICLK10

VDDPCI

3V66_0

3V66_1

3V66_2

GND66

SDATA

SCLK

VDD48

48MHz/FS4*

24_48MHz

GND48

Features:

•

Up to 180MHz frequency support

I²

{

Use a zero delay buffer such as the ICS9179-06 to

generate SDRAM clocks.

PD#

•

Support power management: Power down Mode

fromI²Cprogramming.

48-pin SSOP

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

Spread spectrum for EMI control

± 0.25% center spread).

•

Usesexternal14.318MHzcrystal

5 - FS pins for frequency select

KeySpecifications:

•

CPU Output Jitter: <250ps

IOAPIC Output Jitter: <500ps

Block Diagram

48MHz, 3V66, PCIOutputJitter:<500ps

Ref Output Jitter. <1000ps

PLL2

48MHz

CPUOutputSkew:<175ps

24_48MHz

/ 2

IOAPIC Output Skew <250ps

XTAL

OSC

REF(1:0)

PCIOutputSkew:<580ps

3V66OutputSkew<250ps

PLL1

Spread

CPU

DIVDER

CPUCLK (3:0)

IOAPIC (2:0)

CPU to 3V66 Output Offset: 0.8 - 1.8ns (typ = 1.3ns)

CPU to PCI Output Offset: 0.0 - 1.5ns (typ = 1.0ns)

CPU to IOAPIC Output Offset: 1.5 - 4.0ns (typ = 2.0ns)

Spectrum

IOAPIC

DIVDER

SEL24_48#

SDATA

PCI

DIVDER

Control

Logic

PCICLK (10:0)

PCICLK_F

I²C

{

SCLK

FS(4:0)

Config.

Reg.

3V66

DIVDER

3V66 (2:0)

PD#

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

9248-107RevA -5/21/01

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

12 3 4 5 6 7...14

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