Datasheet > ICS9248-157

ICS9248-157

更新时间： 2024-09-28 22:55:27

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
11页	152K
描述
Frequency Timing Generator for Pentium II Systems

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数据手册

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ICS9248-157 数据手册

Integrated

Circuit

Systems, Inc.

ICS9248-157

Frequency Timing Generator for Pentium II Systems

Recommended Application:

ALI1621/1632M style chipsets

Output Features:

•

2 - CPUs @2.5V, up to 140MHz.

7 - PCI @3.3V, (including one free running)

1 - 48MHz, @3.3V fixed.

Pin Configuration

*FS1/REF0

VDDR

2 - REF @3.3V, 14.318MHz.

REF1/FS0*

SPREAD#

VDDL

CPUCLK1

CPUCLK0/F

GNDL

GND

PCI_STOP#

VDDA

Features:

•

**FS2/PCICLK_F

*SEL_CPUF#/PCICLK0

PCICLK1

Up to 140 MHz frequency support

Support power management: CPU, PCI stop and

Power down.

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

Uses external 14.318MHz crystal

FS pins for frequency select

GND

VDDPCI

PCICLK2

PCICLK3

PCICLK4

PCICLK_E

VDD48

•

CPU_STOP#

PD#

DIV/4#

Key Specifications:

GND

*FS3/48MHz

•

CPU – CPU: <175ps

PCI – PCI: <250ps

CPU(early)-PCI: 1.5ns - 4ns

PCI_E (early) - PCI: 2.1ns

28 Pin 209mil SSOP

*These inputs have a 120K pull up to VDD

**These inputs have a 120K pull down to GND

Block Diagram

Functionality

FS3

FS2

FS1 FS0

CPU

33.33

63.33

69.99

66.66

97.00

96.22

91.50

83.33

50.00

95.25

105.00

100.00

66.66

126.35

139.65

133.33

PCI

16.66

31.66

35.00

33.33

32.33

32.07

30.50

27.77

16.66

31.75

35.00

33.33

16.66

31.66

35.00

33.33

REF (1:0)

OSC

CPU_STOP#

PLL

Spread

Spectrum

CPU

STOP

CPUCLK 1

FS (3:0)

/ 4

CPU

STOP

CPUCLK0/F

Glitch

Free

Control

Logic

PD#

Div4#

/ 2

/ 3

BUS

STOP

SPREAD#

PCICLK (4:0),

PCICLK_E

SEL_CPUF#

PCI_STOP#

PCICLK_F

48MHz

PLL2

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

9248-157 Rev A - 1/16/01

Third party brands and names are the property of their respective owners.

12 3 4 5 6 7...11

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