9FG430 Datasheet: Four Output Differential Frequency Generator





9FG430 Four Output Differential Frequency Generator Datasheet

Part Number 9FG430
Description Four Output Differential Frequency Generator
Manufacture IDT
Total Page 18 Pages
PDF Download Download 9FG430 Datasheet PDF

Features: DATASHEET Four Output Differential Freq uency Generator for PCIe Gen3 and QPI 9FG430 General Description: The 9FG430 is a Frequency Timing Generator that p rovides 4 HCSL differential output pair s. These outputs support PCI-Express Ge n3, and QPI applications. The part supp orts Spread Spectrum and synthesizes se veral additional output frequencies fro m either a 14.31818 MHz crystal, a 25 M Hz crystal or reference input clock. Th e 9FG430 also outputs a copy of the ref erence clock. Complete control of the d evice is available via strapping pins o r via the SMBus inteface. Recommended A pplication: 4 Output Differential Frequ ency Generator for PCIe Gen3 and QPI Ou tput Features: • 4 - 0.7V current mod e differential HCSL output pairs • 1 - 3.3V LVTTL REF output Features/Benef its: • Pin-to-Pin with 9FG104D/Easy u pgrade to PCIe Gen3 • Generates commo n frequencies from 14.318 MHz or 25 MHz ; single part supports mulitple applica tions • Provides copy of reference output; eleminates need fo.

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DATASHEET
Four Output Differential Frequency Generator
for PCIe Gen3 and QPI
9FG430
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
XIN/CLKIN
X2
OSC
REFOUT
PROGRAMMABLE
SPREAD PLL
STOP
LOGIC
4
DIF(3:0)
SPREAD
SEL14M_25M#
DIF_STOP#
FS(2:0)
SDATA
SCLK
CONTROL
LOGIC
IREF
IDT® Four Output Differential Frequency Generator for PCIe Gen3 and QPI
1
1681C—08/26/10

                    
                    






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