Si52212/Si52208/Si52204/Si52202 Data
Sheet
12/8/4/2-Output PCI-Express Gen 1/2/3/4 and SRIS Clock
Generator
KEY FEATURES OR KEY POINTS
• 12/8/4/2-output low-power, push-pull HCSL
compatible PCI-Express Gen 1, Gen 2,
Gen 3, Gen 4 and SRIS-compliant outputs
The Si522xx is the industry's highest performance and lowest power PCI Express clock
generator family for 1.5–1.8 V PCIe Gen1/2/3/4 and SRIS applications. The Si52212,
Si52208, and Si52204 can source twelve, eight, and four 100 MHz PCIe differential
clock outputs, respectively, plus one 25 MHz LVCMOS reference clock output. The
Si52202 can source two 100 MHz PCIe clock outputs only. All differential clock outputs
are compliant to PCIe Gen1/2/3/4 common clock and separate reference clock architec-
tures specifications.
• Low jitter: 0.4 ps max
2
•
Individual hardware control pins and I C
controls for Output Enable, Spread
Spectrum Enable and Frequency Select
• Triangular spread spectrum for EMI
reduction, down spread 0.25% or 0.5%
The Si522xx features individual hardware control pins for enabling and disabling each
output, spread spectrum enable/disable for EMI reduction, and frequency select to se-
lect 133 MHz or 200 MHz differential output frequencies. These features can also be
controlled via I2C.
• Internal 100 Ω or 85 Ω line matching
• Adjustable output slew rate
• Power down (PWRDNb) function supports
Wake-on LAN (except Si52202)
The small footprint and low power consumption make this family of PCIe clock genera-
tors ideal for industrial and consumer applications.
• One non-spread, LVMCOS reference clock
output (except Si52202)
• Frequency Select to select 133 MHz or
200 MHz (except Si52202)
For more information about PCI-Express, Silicon Labs' complete PCIe portfolio, applica-
tion notes, and design tools, including the Silicon Labs PCIe Clock Jitter Tool for PCI-
Express compliance, please visit http://www.silabs.com/pcie-learningcenter.
• 25 MHz crystal input or clock input
2
•
I C support with readback capabilities
Applications
• Extended temperature: –40 to 85 °C
• Servers
• 1.5–1.8 V power supply, with separate
VDD and VDD_IO
• Storage
• Data Centers
• Small QFN packages
• PCIe Add-on Cards
• Network Interface Cards (NIC)
• Graphics Adapter Cards
• Multi-function Printers
• Digital Single-Lens Reflex (DSLR) Cameras
• Digital Still Cameras
• Digital Video Cameras
• Docking Stations
• Pb-free, RoHS-6 compliant
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This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Preliminary Rev. 0.7