9FG830 Datasheet | Eight Output Differential Frequency Generator





(Datasheet) 9FG830 Datasheet PDF Download

Part Number 9FG830
Description Eight Output Differential Frequency Generator
Manufacture IDT
Total Page 19 Pages
PDF Download Download 9FG830 Datasheet PDF

Features: DATASHEET Eight Output Differential Fre quency Generator for PCIe Gen3 and QPI 9FG830 General Description: The 9FG83 0 is a Frequency Timing Generator that provides 8 HCSL differential output pai rs. These outputs support PCI-Express G en3, and QPI applications. The part sup ports Spread Spectrum and synthesizes s everal additional output frequencies fr om either a 14.31818 MHz crystal, a 25 MHz crystal or reference input clock. T he 9FG830 also outputs a copy of the re ference clock. Complete control of the device is available via strapping pins or via the SMBus interface. Recommended Application: 8 Output Differential Out put Frequency Generator for PCIe Gen3 a nd QPI Features/Benefits: • Pin-to-P in with 9FG108D; Easy upgrade to PCIe G en3 • Generates common frequencies fr om 14.318 MHz or 25 MHz; single part su pports mulitple applications • Provid es copy of reference output; eleminates need for additional crystal or oscilla tor • Three spread spectrum modes: -0.5%, +/-0.25%, and off; .

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DATASHEET
Eight Output Differential Frequency Generator
for PCIe Gen3 and QPI
9FG830
General Description:
The 9FG830 is a Frequency Timing Generator that provides 8
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 9FG830 also outputs a copy of the reference clock. Complete
control of the device is available via strapping pins or via the
SMBus interface.
Recommended Application:
8 Output Differential Output Frequency Generator for PCIe Gen3
and QPI
Features/Benefits:
• Pin-to-Pin with 9FG108D; 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
• Three spread spectrum modes: -0.5%, +/-0.25%, and off;
EMI reduction
• 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
Output Features:
• 8 - 0.7V current mode differential HCSL output pairs
• 1 - 3.3V LVTTL REF output
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
OE(7:0)
OSC
PROGRAMMABLE
SPREAD PLL
STOP
LOGIC
8
REFOUT
DIF(7:0)
SPREAD
SEL14M_25M#
DIF_STOP#
FS(2:0)
SDATA
SCLK
CONTROL
LOGIC
IREF
IDT® Eight Output Differential Frequency Generator for PCIe Gen3 and QPI
1
1680C—08/26/10

                    
                    






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