3

Integrated

Circuit

Systems, Inc.

ICS9FG104

0839D—06/02/05

The ICS9FG104 is a Frequency Timing Generator that provides 4 differential output pairs that are compliant to the Intel CK410

specification. It also provides support for PCI-Express 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 50 ps and output-to-output skew of less than 35 ps.

The ICS9FG104 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

STOP

LOGIC

XIN/CLKIN

X2

DIF(3:0)

CONTROL

LOGIC

SPREAD

FS(2:0)

SDATA

SCLK

SEL14M_25M#

DIF_STOP#

PROGRAMMABLE

SPREAD PLL

4

IREF

2

OSC

R EF OU T

VDD

GND

34

9,21

10,20

28

27

IREF, Analog VDD, GND for PLL Core

Description

Pin Number

REFOUT, Digital Inputs

DIF Outputs