ICS9FG104

Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA

ICS9FG104

REV K

04/12/07

Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA

DATASHEET

1

Description

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.

Key Specifications

•

Output cycle-to-cycle jitter < 50 ps

•

Output to output skew < 35 ps

•

+/-300 ppm frequency accuracy on output clocks

•

+/- 150 ppm frequency accuracy @ 100 MHz outputs

•

28-pin SSOP/TSSOP package

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Available in RoHS compliant packaging

Features/Benefits

•

Generates common frequencies from 14.318 MHz or

25 MHz

•

Crystal or reference input

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4 - 0.7V current-mode differential output pairs

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Supports Serial-ATA at 100 MHz

•

Two spread spectrum modes: 0 to -0.5 downspread

and +/-0.25% centerspread

•

Unused inputs may be disabled in either driven or Hi-Z

state for power management.

•

M/N Programming

Funtional Block Diagram

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