9FG430_17 Datasheet, PDF (1/18 Pages) Integrated Device Technology – Four Output Differential Frequency Generator for PCIe Gen3 and QPI

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
4
LOGIC
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
1681D—04/04/17