AV9248-128 Ver la hoja de datos (PDF) - Integrated Circuit Systems

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AV9248-128

Frequency Generator & Integrated Buffers

Integrated Circuit Systems 

ICS9248-128

General Description

The ICS9248-128 is the single chip clock solution for Desktop/Notebook designs using the SIS style chipset. It provides all

necessary clock signals for such a system.

Spread spectrum may be enabled through I2C programming. Spread spectrum typically reduces system EMI by 8dB to 10dB.

This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-128 employs a

proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.

Serial programming I2C interface allows changing functions, stop clock programming and frequency selection. The SD_SEL

latched input allows the SDRAM frequency to follow the CPUCLK frequency(SD_SEL=1) or other clock frequencies

(SD_SEL=0)

Mode Pin - Power Management Input Control

MODE, Pin 2

(Latched Input)

0

1

Pin 17

CPU_STOP#

(INPUT)

SDRAM 11

(OUTPUT)

Pin 18

PCI_STOP#

(INPUT)

SDRAM 10

(OUTPUT)

Pin 20

SDRAM_STOP#

(INPUT)

SDRAM9

(OUTPUT)

Pin 21

PD#

(INPUT)

SDRAM8

(OUTPUT)

Power Management Functionality

PD# CPU_STOP# PCI_STOP# SDRAM_STOP PCICLK

(0:4)

0

X

X

X

Stopped

Low

1

1

1

1

Running

1

1

1

0

Running

1

1

0

1

1

0

1

Stopped

Low

0

Stopped

Low

1

0

1

1

Running

1

0

1

1

0

0

1

0

0

0

Running

1

Stopped

Low

Stopped

0

Low

SDRAM

(0:12)

Stopped

Low

Running

Stopped

Low

PCICLK_F

Stopped

Low

Running

Running

CPUCLK

Stopped

Low

Running

Running

Running Running Running

Stopped

Low

Running

Stopped

Low

Running

Stopped

Low

Running

Running

Running

Running

Running

Running

Stopped

Low

Stopped

Low

Stopped

Low

Stopped

Low

Crystal

OSC

Stopped

Low

Running

Running

Running

Running

Running

Running

Running

Running

VCO

Stopped

Low

Running

Running

Running

Running

Running

Running

Running

Running

CPU 3.3#_2.5V Buffer selector for CPUCLK drivers.

CPU3.3#_2.5

Input level

(Latched Data)

1

0

Buffer Selected

for operation at:

2.5V VDD

3.3V VDD

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

3

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