9FG430 datasheet(1/18 Pages) IDT

Part #	9FG430

Description	Four Output Differential Frequency Generator for PCIe Gen3 and QPI

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Manufacturer	IDT [Integrated Device Technology]

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9FG430

IDT® Four Output Differential Frequency Generator for PCIe Gen3 and QPI

1681C—08/26/10

Four Output Differential Frequency Generator

for PCIe Gen3 and QPI

1

DATASHEET

General Description:

The 9FG430 is a Frequency Timing Generator that provides 4

HCSL differential output pairs. These outputs support PCI-Express

Gen3, and QPI applications. The part supports Spread Spectrum

and synthesizes several additional output frequencies from either

a 14.31818 MHz crystal, a 25 MHz crystal or reference input clock.

The 9FG430 also outputs a copy of the reference clock. Complete

control of the device is available via strapping pins or via the

SMBus inteface.

Recommended Application:

4 Output Differential Frequency Generator for PCIe Gen3 and QPI

Output Features:

•

4 - 0.7V current mode differential HCSL output pairs

•

1 - 3.3V LVTTL REF output

Features/Benefits:

•

Pin-to-Pin with 9FG104D/Easy upgrade to PCIe Gen3

•

Generates common frequencies from 14.318 MHz or 25

MHz; single part supports mulitple applications

•

Provides copy of reference output; eleminates need for

additional crystal or oscillator

•

Unused outputs may be disabled in Hi-Z; save system

power

•

Device may be configured by SMBus and/or strap pins;

can be used in systems without SMBus

Key Specifications:

•

Cycle-to-cycle jitter: < 50ps with 25MHz input

•

Output-to-output skew: <50ps

•

Phase jitter: PCIe Gen3 < 1ps rms

•

Phase jitter: QPI 9.6GB/s < 0.2ps rms

•

10 ppm synthesis error with 25MHz input and Spread Off

Functional 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

OSC

REFOUT

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