Integrated

Circuit

Systems, Inc.

General Description

Features

ICS9148-93

Advance Information

Block Diagram

Pentium is a trademark of Intel Corporation

I

9148-93 Rev - 1/22/99

Pin Configuration

•

Generates the following system clocks:

-4CPU(2.5V/3.3V)upto100MHz.

-6PCI(3.3V)@ 33.3MHz

-2AGP(3.3V)@2x PCI

- 12 SDRAMs(3.3V) @ either CPU orAGP

-2REF(3.3V)@14.318MHz

•

Skew characteristics:

- CPU – CPU<250ps

- SDRAM – SDRAM < 250ps

- CPU – SDRAM < 250ps

- CPU(early) – PCI : 1-4ns

•

Supports Spread Spectrum modulation +0.25, ±0.6%

•

Select, Spread Spectrum.

•

Efficient Power management scheme through PCI and CPU

STOPCLOCKS.

•

Uses external 14.318MHz crystal

•

48pin300milSSOP.

48-Pin SSOP

Power Groups

VDD1 = REF (0:1), X1, X2

VDD2 = PCICLK_F, PCICLK(0:5)

VDD3 = SDRAM (0:11), supply for PLL core,

24 MHz, 48MHz

VDD4=AGP(0:1)

VDDL=CPUCLK(0:3)

* Internal Pull-up Resistor of

240K to 3.3V on indicated inputs

The ICS9148-93 is the single chip clock solution for Desktop/

Notebook designs using the VIA MVP3 style chipset. It

provides all necessary clock signals for such a system.

Spread spectrum typically reduces system EMI by 8dB to

10dB. This simplifies EMI qualification without resorting to

board design iterations or costly shielding. The ICS9148-93

employs a proprietary closed loop design, which tightly

controls the percentage of spreading over process and

temperature variations.

stop clock programming and frequency selection. The SD_SEL

latched input allows the SDRAM frequency to follow the

CPUCLK frequency(SD_SEL=1) or the AGP clock

frequency(SD_SEL=0).

ADVANCE INFORMATION documents contain information on products

in the formative or design phase development. Characteristic data and

other specifications are design goals. ICS reserves the right to change or

discontinue these products without notice.