2

Integrated

Circuit

Systems, Inc.

ICS950223

0496C—05/06/05

Pin Description

The ICS950223 is a single chip clock solution for desktop designs using the Intel Brookdale chipset with PC133 or DDR memory.

It provides all necessary clock signals for such a system.

The ICS950223 is part of a whole new line of ICS clock generators and buffers called TCH™ (Timing Control Hub). ICS is the first

to introduce a whole product line which offers full programmability and flexibility on a single clock device.This part incorporates ICS's

newest clock technology which offers more robust features and functionality. Employing the use of a serially programmable I

interface, this device can adjust the output clocks by configuring the frequency setting, the output divider ratios, selecting the ideal

spread percentage, the output skew, the output strength, and enabling/disabling each individual output clock.TCH also incorporates

ICS's Watchdog Timer technology and a reset feature to provide a safe setting under unstable system conditions. M/N control can

configure output frequency with resolution up to 0.1MHz increment.With all these programmable features ICS's, TCH makes mother

board testing, tuning and improvement very simple.

General Description

PIN

PIN

PIN

#

NAME

TYPE

1

*MULTSEL1/REF1

I/O

3.3V LVTTL input for selection the current multiplier for CPU outputs / 14.318 MHz reference

clock.

2

VDDREF

PWR Ref, XTAL power supply, nominal 3.3V

3

X1

IN

Crystal input, Nominally 14.318MHz.

4

X2

OUT Crystal output, Nominally 14.318MHz

5

GND

PWR Ground pin.

6

*FS2/PCICLK0

I/O

Frequency select latch input pin / 3.3V PCI clock output.

7

*FS3/PCICLK1

I/O

Frequency select latch input pin / 3.3V PCI clock output.

8

**SEL48_24#/PCICLK2

I/O

Latched select input for 48/24MHz output. 0=24MHz, 1 = 48MHz / 3.3V PCI clock output.

9

VDDPCI

PWR Power supply for PCI clocks, nominal 3.3V

10

*FS4/PCICLK3

I/O

Frequency select latch input pin / 3.3V PCI clock output.

11

PCICLK4

OUT PCI clock output.

12

PCICLK5

OUT PCI clock output.

13

GND

PWR Ground pin.

14

PCICLK6

OUT PCI clock output.

15

PCICLK7

OUT PCI clock output.

16

PCICLK8

OUT PCI clock output.

17

PCICLK9

OUT PCI clock output.

18

VDDPCI

PWR Power supply for PCI clocks, nominal 3.3V

19

Vttpwr_GD#

IN

This 3.3V LVTTL input is a level sensitive strobe used to determine when latch inputs are

valid and are ready to be sampled. This is an active low input.

20

RESET#

OUT

Real time system reset signal for frequency gear ratio change or watchdog timer timeout.

This signal is active low.

21

GND

PWR Ground pin.

22

~*FS0/48MHz

I/O

Frequency select latch input pin / Fixed 48MHz clock output. 3.3V

23

*FS1/24_48MHz

I/O

Frequency select latch input pin / Fixed 24 or 48MHz clock output. 3.3V.

24

AVDD48

PWR Power for 24/48MHz outputs and fixed PLL core, nominal 3.3V

* Internal Pull-Up Resistor

** Internal Pull-Down Resistor

DESCRIPTION

~ This output has 2X drive