Integrated

Circuit

Systems, Inc.

ICS9FG110

Advance Information

0872—12/11/03

Pin Configuration

Recommended Application:

Frequency Timing Generator for Differential PCI-Express clocks

Features:

•

Generates common PCI-Express frequencies from

reference input clock (33.33MHz)

•

7 - 0.7V current-mode differential output pairs

•

Three spread spectrum modes: spread tracking mode, 0

to -0.5 downspread and +/-0.25% centerspread

•

Support for M/N programming

•

Programmable spread percentage

•

Programmable output divider

•

SMBus address is DC/DD

Key Specifications:

•

Output cycle-to-cycle jitter < 85 ps

•

Output to output skew < 85 ps

•

+/-300 ppm frequency accuracy on output clocks

Programmable FTG for Differential PCI-Express

ADVANCE INFORMATION documents contain information on products in the formative or design phase development. Characteristic data and other specifications are design goals.

ICS reserves the right to change or discontinue these products without notice. Third party brands and names are the property of their respective owners.

Power Groups

REFIN 1

28 VDDA

SDATA 2

27 GNDA

SCLK 3

26 IREF

*PD# 425 MODE_SEL**

PCIEXT0 5

24 PCIEXT6

PCIEXC0 6

23 PCIEXC6

VDDPCIEX 722 VDDPCIEX

GND 8

21 GND

PCIEXT1 9

20 PCIEXT5

PCIEXC1 10

19 PCIEXC5

PCIEXT2 11

18 PCIEXT4

PCIEXC2 12

17 PCIEXC4

PCIEXT3 13

16 VDDPCIEX

PCIEXC314

15GND

28-SSOP/TSSOP

** This pin have 120K pull-down to GND

* This pin have 120K pull-up to VDD

VDD

GND

28

27

Analog pow er & GND for CPU Core

7, 22

8, 15, 21

Pow er & GND for PCI Express Clock

Outputs

Pin Number

Description

Block Diagram

I REF

Programmable

Spread

PLL1

Programmable

Frequency

Dividers

REFIN

SDATA

SCLK

MODE_SEL

Control

Logic

PCIEXC (6:0)

PCIEXT (6:0)

Functionality Table

Spread Spectrum %

Spread Tracking Input

+/- 0.25 Center Spread

MODE_SEL

PCIEX Freq

0

1

100

100