Integrated

Circuit

Systems, Inc.

General Description

Features

ICS9150- 04

Block Diagram

Pentium is a trademark of Intel Corporation

I

Pentium Pro™ and SDRAM Frequency Generator

9150-04 RevD 07/27/98

Pin Configuration

•

Generates five processor, six bus, one 14.31818MHz

(3.3V) three IOAPIC, 16 SDRAM clocks, 48MHz USB

clock and 24MHz Super I/O clock.

•

Synchronous clocks skew matched to 250 ps window

on CPUCLKs and 500ps window on PCICLKs

•

Skew from CPU (earlier) to PCI clock - 1 to 4ns, 2.6ns

nom.

•

Power Management Control Input pins when MODE

Low

•

VDD(1:4) - 3.3V ±10%

(inputs 5V tolerant w/series R )

•

VDDL(1:2) - 2.5V or 3.3V ±5%

spectrum options (±0.5% or ±1.5%, center spread or

down spread)

•

56-pin SSOP package

56-Pin SSOP

The ICS9150-04 generates all clocks required for high speed

RISC or CISC microprocessor systems such as Intel

PentiumPro or Cyrix. Eight different reference frequency

multiplying factors are selectable from 50 to 83.3MHz.

Features include five CPU, seven PCI and Sixteen SDRAM

clocks. One reference output is available equal to the crystal

frequency, plus three IOAPIC outputs powered by VDDL1.

One 48 MHz for USB is provided plus a 24 MHz. Spread

Spectrum built in up to ±1.5% modulation to reduce EMI.

stop clock programing and Frequency selection. Rise time

adjustment for VDD at 3.3V or 2.5V CPU. Additionally, the

device meets the Pentium power-up stabilization, which

requires that CPU and PCI clocks be stable within 2ms after

power-up.

High drive PCICLK and SDRAM outputs typically provide

greater than 1 V/ns slew rate into 30pF loads. CPUCLK outputs

typically provide better than 1V/ns slew rate into 20pF loads

while maintaining 50±5% duty cycle. The REF 24 and 48 MHz

and SDRAM 12, 13 clock outputs typically provide better

than 0.5V/ns slew rates.

Power Groups

VDD1 = REF, X1, X2

VDD2 = PCICLK_F, PCICLK(0:5)

VDD3 = SDRAM (0:15), supply for PLL core,

VDD4 = 48MHz, 24MHz

VDDL1 = IOAPIC (0:2)

VDDL2 = CPUCLK (0:4)

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.