4

Integrated

Circuit

Systems, Inc.

ICS9FG108

Advance Information

0823—04/02/04

ICS9FG108 is a Frequency Timing Generator that provides 8 differential output pairs that are compliant to the Intel CK410

specification. It also provides support for PCI-Express, next generation I/O, and SATA. The part synthesizes several output

frequencies from either a 14.31818 Mhz crystal or a 25 MHz crystal. The device can also be driven by a reference input clock

instead of a crystal. It provides outputs with cycle-to-cycle jitter of less than 85 ps and output-to-output skew of less than 85 ps.

ICS9FG108 also provides a copy of the reference clock. Frequency selection can be accomplished via strap pins or SMBus

control.

General Description

Block Diagram

Power Groups

VDD

GND

34

10,14,19,31,36,40

15,35

N/A

47

48

47

IREF

Analog VDD & GND for PLL Core

Description

Pin Number

REFOUT, Digital Inputs, SMBus

DIF Outputs

STOP

LOGIC

XIN/CLKIN

X2

DIF(7:0)

CONTROL

LOGIC

SPREAD

FS(2:0)

SDATA

SCLK

SEL14M_25M#

DIF_STOP#

PROGRAMMABLE

SPREAD PLL

4

IREF

OSC

R EF OU T

OE(7:0)