ICS9248-185 Datasheet

IC型号：
ICS9248-185
PDF描述：
Frequency Generator & Integrated Buffers for PENTIUM/ProTM &...
文件大小：
102.51KB
PDF页数：
11页
芯片厂家：
ICS

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Integrated

Circuit

Systems, Inc.

ICS9248-185

Frequency Generator & Integrated Buffers for PENTIUM/Pro

& K6

Recommended Application:

VIA PM133 chipset

Output Features:

鈥?/div>

2 - CPUs @ 2.5V

鈥?/div>

5 - SDRAM @ 3.3V

鈥?/div>

3 - PCI @ 3.3V,

鈥?/div>

1 - 48MHz, @ 3.3V fixed.

鈥?/div>

2 - REF @ 3.3V, 14.318MHz.

Features:

鈥?Up to 133MHz frequency support

鈥?Support power management: PCI_STOP & CLK_STOP

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

鈥?Uses external 14.318MHz crystal

鈥?FS pins for frequency select

Key Specifications:

鈥?CPU 鈥?PCI Skew: 1-4ns

鈥?PCI 鈥?PCI Skew: 卤500ps

鈥?CPU 鈥?CPU Skew: 卤175ps

鈥?CPU Jitter: 250ps (cyc-cyc)

鈥?PCI Jitter: 500ps (cyc-cyc)

Pin Configuration

VDD

REF0

GND

VDDPCI

*PCICLK_F

GND

1, 2

FS1/PCICLK0

BUFFER_IN

PCICLK1

PCI_STOP#

GND

*FS0/48MHz

REF1/FREE_SEL*

VDDL

CPUCLK0/_F

CPUCLK1

GND

CLK_STOP#

SDRAM0/_F

SDRAM1

SDRAM2

GND

VDDSDR

SDRAM3

SDRAM4

VDD48

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

CPU

DIVDER

Stop

REF (1:0)

Frequency Select

FS1

FS0

CPUCLK

66.66

100.00

97.00

133.33

PCICLK

33.33

32.33

33.33

Down

Spread

-0.5%

CPUCLK1

CPUCLK0/_F

PLL1

Spread

Spectrum

BUFFER_IN

Control

PCI_STOP#

CLK_STOP#

FS (1:0)

Logic

PCI

DIVDER

Stop

SDRAM (4:1)

SDRAM0/_F

PCICLK (1:0)

PCICLK_F

Config.

Reg.

ICS9248-185

Pentium is a trademark of Intel Corporation

C 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.

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