Datasheet > ICS9248-64

ICS9248-64

更新时间： 2024-11-12 22:55:27

品牌	Logo	应用领域
矽成 - ICSI		时钟
页数	文件大小	规格书
15页	143K
描述
AMD-K7TM System Clock Chip

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ICS9248-64 数据手册

Integrated

Circuit

Systems, Inc.

ICS9248-64

AMD-K7 System Clock Chip

General Description

Features

The ICS9248-64 is a main clock synthesizer chip for AMD-

K7 based systems. This provides all clocks required for such

a system when used with a Zero Delay Buffer Chip such as

the ICS9179-06.

•

Generates the following system clocks:

- 3 differential pair open drain CPU clocks

(1.5V external

pull-up; up to 133MHz).

- 8 PCI including 1 free running (3.3V) @33.3MHz.

- 2AGP(3.3V) up to 66.6MHz.

- 2 REF(3.3V)@14.318MHz

- 1 48MHz(3.3V)

Spread Spectrum may be enabled by driving the SPREAD#

pin active. Spread spectrum typically reduces system EMI by

8dB to 10dB. This simplifies EMI qualification without

resorting to board design iterations or costly shielding. The

ICS9248-64 employs a proprietary closed loop design, which

tightly controls the percentage of spreading over process and

temperature variations.

- 24 / 48MHz(3.3V)

•

Skew characteristics:

- CPU -CPU<250ps

- CPUt - CPUc <200ps (differential pair)

- PCI – PCI: <500ps

- CPU – SDRAM_OUT: < 250ps

- CPU –AGP <500ps

•

Efficient Power Management through PD#, PCI_STOP#

and CPU_STOP#.

Spread Spectrum option for EMI reduction

(-1.0% down spread).

Block Diagram

Uses external 14.318 MHz crystal

Pin Configuration

*FS0/REF0

*FS1/REF1

GNDREF

VDDREF

GNDSD

SDRAM_OUT

VDDSD

RESERVED

CPUCLKC2

CPUCLKT2

GNDCPU

CUCLKC1

CPUCLKT1

GND

CPUCLKC0

CPUCLKT0

RESERVED

VDD

GNDPCI

PCICLK_F

PCICLK0

VDDPCI

PCICLK1

PCICLK2

GNDPCI

PCICLK3

PCICLK4

VDDPCI

PCICLK5

PCICLK6

VDDAGP

AGP0

AGP1

GNDAGP

VDD48

GND

PCI_STOP#

CPU_STOP#

PD#

SPREAD#

TEST#

SDATA

SCLK

GND48

I²C

{

48MHz

SEL24_48#/24-48MHz

48-Pin SSOP

* Internal 120K pullup resistor on indicated inputs

AMD-K is a trademark of Advanced Micro Devices.

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

9248-64RevC03/19/01

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

12 3 4 5 6 7...15

中文翻译

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与ICS9248-64相关器件

型号	品牌	获取价格	描述	数据表
ICS9248-65	ICSI	获取价格	Frequency Timing Generator for PENDIUM II Systems
ICS9248-66	ICSI	获取价格	Frequency Timing Generator for PENTIUM II Systems
ICS9248-72	ICSI	获取价格	Frequency Timing Generator for PENTIUM II Systems
ICS9248-73	ICSI	获取价格	Frequency Timing Generator for Pentium II Systems
ICS9248-77	ICSI	获取价格	Frequency Timing Generator for PENTIUM II Systems
ICS9248-78	ICSI	获取价格	Frequency Timing Generator for Pentium II Systems
ICS9248-80	ICSI	获取价格	General Purpose 133MHz System Clock
ICS9248-81	ICSI	获取价格	Frequency Generator & Integrated Buffers
ICS9248-87	ICSI	获取价格	Frequency Generator & Integrated Buffers for
ICS9248-90	ICSI	获取价格	Frequency Generator & Integrated Buffers for PENTIUM/ProTM

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