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ICS9248-95

Frequency Generator & Integrated Buffers for PENTIUM/Pro™

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS9248 - 95

Frequency Generator & Integrated Buffers for PENTIUM/ProTM

General Description

The ICS9248-95 is the single chip clock solution for Desktop

designs using the VIA MVP4 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 ICS9248-95

employs a proprietary closed loop design, which tightly

controls the percentage of spreading over process and

temperature variations.

Block Diagram

Features

• Up to 124MHz frequency support.

• Spread Spectrum for EMI control ±0.5% center

spread and ±0.25% center spread

• Serial I2C interface for Power Management,

Frequency Select, Spread Spectrum.

• Provides the following system clocks

- 4-CPUs @ 3.3V, up to 124MHz.

- 13-SDRAMs @3.3V, up to 124MHz

(including SDRAM_F)

- 6-PCI @3.3V, CPU/2 or CPU/3

(including PCICLK_F)

(including 1 free running).

- 1-24MHz @3.3V fixed.

- 1-48MHz @3.3V fixed.

- 2-REF @3.3V, 14.318MHz.

• Efficient Power management scheme through PCI

and STOP CLOCKS.

• Spread Spectrum ±.25%, & ±.5% center spread

Pin Configuration

Power Groups

VDDCPU, GNDCPU = CPUCLK [2:0], CPUCLK_F

VDDSDR, GNDSDR = SDRAMCLKS [11:0], SDRAM_F

VDDPCI, GNDPCI = PCICLKS [4:0], PCICLK_F

VDD48 = 48MHz, 24MHz

VDDREF, GNDREF = REF, X1, X2

310D—04/12/05

48-Pin SSOP

* Internal Pull-up Resistor of 240K to VDD

Pentium is a trademark of Intel Corporation

I2C is a trademark of Philips Corporation

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