ICS9248-107 Datasheet

IC型號：
ICS9248-107
PDF描述：
Frequency Timing Generator for PENTIUM II Systems
文件大小：
142.26KB
PDF頁數(shù)：
14頁
芯片廠家：
ICS

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Integrated

Circuit

Systems, Inc.

ICS9248-107

Frequency Timing Generator for PENTIUM II Systems

Recommended Application:

RCC chipset

Output Features:

鈥?4 - CPUs @ 2.5V, up to 180MHz.

鈥?3 - IOAPIC @ 2.5V

鈥?3 - 3V66MHz @ 3.3V.

鈥?11 - PCIs @ 3.3V

鈥?1 - 48MHz, @ 3.3V fixed

鈥?1 - 24/48MHz, @ 3.3V

Features:

鈥?Up to 180MHz frequency support

鈥?/div>

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

generate SDRAM clocks.

Support power management: Power down Mode

from I

C programming.

Spread spectrum for EMI control

鹵 0.25% center spread).

Uses external 14.318MHz crystal

5 - FS pins for frequency select

Pin Configuration

GNDREF

REF0

*SEL24_48#/REF1

VDDREF

GNDPCI

*FS0/PCICLK_F

*FS1/PCICLK1

VDDPCI

*FS2/PCICLK2

*FS3/PCICLK3

GNDPCI

PCICLK4

PCICLK5

VDDPCI

PCICLK6

PCICLK7

GNDPCI

PCICLK8

PCICLK9

PCICLK10

VDDPCI

PD#

VDDLAPIC

IOAPIC0

IOAPIC1

GNDLAPIC

IOAPIC2

VDDLCPU

CPUCLK0

GNDLCPU

CPUCLK1

VDDLCPU

CPUCLK2

CPUCLK3

GNDLCPU

VDD66

3V66_0

3V66_1

3V66_2

GND66

SDATA

I C

SCLK

VDD48

48MHz/FS4*

24_48MHz

GND48

ICS9248-107

{

48-pin SSOP

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

Key Specifications:

鈥?CPU Output Jitter: <250ps

鈥?/div>

IOAPIC Output Jitter: <500ps

48MHz, 3V66, PCI Output Jitter: <500ps

Ref Output Jitter. <1000ps

PLL2

Block Diagram

48MHz

XTAL

OSC

PLL1

Spread

Spectrum

24_48MHz

CPU Output Skew: <175ps

IOAPIC Output Skew <250ps

PCI Output Skew: <580ps

3V66 Output Skew <250ps

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)

SEL24_48#

I C

REF(1:0)

CPU

DIVDER

CPUCLK (3:0)

IOAPIC

DIVDER

IOAPIC (2:0)

Control

Logic

Config.

Reg.

{

PCI

DIVDER

PCICLK (10:0)

PCICLK_F

SDATA

SCLK

FS(4:0)

PD#

3V66

DIVDER

3V66 (2:0)

9248-107 RevA - 5/21/01

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.

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