Datasheet > ICS9248-185

ICS9248-185

更新时间： 2024-09-28 21:54:11

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
11页	102K
描述
Frequency Generator & Integrated Buffers for PENTIUM/ProTM & K6

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ICS9248-185 数据手册

Integrated

Circuit

Systems, Inc.

ICS9248-185

Frequency Generator & Integrated Buffers for PENTIUM/Pro^TM

& K6

RecommendedApplication:

VIAPM133chipset

OutputFeatures:

Pin Configuration

•

2 - CPUs @ 2.5V

5-SDRAM@3.3V

3-PCI@3.3V,

1-48MHz, @3.3Vfixed.

2-REF@3.3V,14.318MHz.

VDD

REF0

REF1/FREE_SEL*¹

VDDL

GND

CPUCLK0/_F

CPUCLK1

GND

VDDPCI

¹*PCICLK_F

GND

CLK_STOP#

SDRAM0/_F

SDRAM1

SDRAM2

GND

VDDSDR

SDRAM3

SDRAM4

VDD48

Features:

•

Up to 133MHz frequency support

^{1, 2}FS1/PCICLK0

BUFFER_IN

¹PCICLK1

PCI_STOP#

GND

Supportpowermanagement:PCI_STOP&CLK_STOP

Spread spectrum for EMI control (-0.5% down spread).

Usesexternal14.318MHzcrystal

FS pins for frequency select

*FS0/48MHz

KeySpecifications:

•

CPU–PCISkew:1-4ns

PCI–PCISkew:±500ps

CPU–CPUSkew:±175ps

CPU Jitter: 250ps (cyc-cyc)

PCI Jitter: 500ps (cyc-cyc)

28-Pin SSOP/TSSOP

* Internal Pull-up Resistor of 120K to VDD

1. These pin will have 2X drive strength

2. FS1 is a pull down

Block Diagram

PLL2

48MHz

XTAL

OSC

REF (1:0)

CPUCLK1

Frequency Select

CPU

DIVDER

Stop

PLL1

Spread

Spectrum

CPUCLK0/_F

Down

Spread

FS1

FS0 CPUCLK PCICLK

BUFFER_IN

SDRAM (4:1)

SDRAM0/_F

66.66

100.00

97.00

33.33

32.33

33.33

-0.5%

Control

Logic

PCI

DIVDER

PCI_STOP#

CLK_STOP#

FS (1:0)

Stop

PCICLK (1:0)

PCICLK_F

Config.

Reg.

133.33

Pentium is a trademark of Intel Corporation

I²C is a trademark of Philips Corporation

9248-185 RevC - 10/25/01

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.

12 3 4 5 6 7...11

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