Si52212/Si52208/Si52204/Si52202
Data Sheet
12/8/4/2-Output PCI-Express Gen 1/2/3/4/5 and SRIS Clock
Generator
The Si52212/08/04/02 are the industry's highest performance and lowest power PCI
Express clock generator family for 1.5–1.8 V PCIe Gen 1/2/3/4/5 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 out-
put. The Si52202 can source two 100 MHz PCIe clock outputs only. All differential clock
outputs are compliant to PCIe Gen1/2/3/4/5 common clock and separate reference clock
architectures specifications.
The Si52212/08/04/02 feature individual hardware control pins for enabling and disa-
bling each output, spread spectrum enable/disable for EMI reduction, and frequency
select to select 100, 133, or 200 MHz differential output frequencies. These features can
also be controlled via I
2
C.
The small footprint and low power consumption make this family of PCIe clock genera-
tors ideal for industrial and consumer applications.
For more information about PCI-Express, Skyworks' complete PCIe portfolio, application
notes, and design tools, including the Skyworks PCIe Clock Jitter Tool for PCI-Express
compliance, please visit the Skyworks
PCI Express Learning Center.
Applications
• Servers
• Storage
• Data Centers
• 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
KEY FEATURES
• 12/8/4/2-output low-power, push-pull HCSL
compatible PCI-Express Gen 1, Gen 2,
Gen 3, Gen 4, Gen 5, and SRIS-compliant
outputs
• Low jitter: 0.13 ps rms max, Gen 5
• Individual hardware control pins and
I
2
C controls for Output Enable, Spread
Spectrum Enable and Frequency Select
• Triangular spread spectrum for EMI
reduction, down spread 0.25% or 0.5%
• Internal 100 Ω or 85 Ω line matching
• Adjustable output slew rate
• Power down (PWRDNb) function supports
Wake-on LAN (except Si52202)
• One non-spread, LVMCOS reference clock
output (except Si52202)
• Frequency Select to select 133 MHz or
200 MHz (except Si52202)
• 25 MHz crystal input or clock input
• I
2
C support with readback capabilities
• Extended temperature: –40 to 85 °C
• 1.5–1.8 V power supply, with separate
VDD and VDD_IO
• Small QFN packages
• Pb-free, RoHS-6 compliant
1
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1
Data Sheet • Feature List
1. Feature List
• 12/8/4/2-output 100 MHz PCIe Gen 1/2/3/4/5 and SRIS compliant clock generator, with push-pull HCSL output drivers
• High port count with push-pull HCSL outputs to support highly integrated solution, eliminating external resistors for the HCSL
output drivers
• Low jitter of 0.13 ps rms max to meet PCIe Gen5 specifications with design margin
• Low power consumption.
• Lowest power consumption in the industry for a 2-output PCIe clock generator
• Individual hardware control pins and I
2
C controls for Output Enable, Spread Spectrum Enable and Frequency Select
• Output Enable function easily disables unused outputs for power saving
• Spread Enable function to turn on/off spread spectrum and to select spread levels, either down spread 0.25% or 0.5%
• Frequency Select function to select output frequency of 100 MHz, 133 MHz, or 200 MHz (except Si52202 where the output
frequency is limited to 100 MHz. Please contact Skyworks for 133 MHz or 200 MHz in Si52202)
• All above functions are controlled by individual hardware pins or I
2
C
• Internal 100 Ω or 85 Ω impedance matching
• Eliminates external line matching resistor to reduce board space
• Adjustable slew rate to improve signal quality for different applications and board designs
• Power down (PWRDNb) function supports Wake-on LAN (except Si52202)
• One non-spread, 25 MHz LVMCOS reference clock output (except Si52202)
• A buffered 25 MHz LVCMOS clock output to drive ASICS or SoCs on board
• 25 MHz reference input
• Supports a standard crystal or clock input for flexibility
• I
2
C support with readback capabilities
• 1.5–1.8 V power supply with separate VDD and VDD_IO (1.05 to 1.8 V)
• Temperature range: –40 °C to 85 °C
• Small QFN packages to optimize board space. Smallest 2-output PCIe clock generator in the industry
• 64-pin QFN (9 x 9 mm) : 12-output
• 48-pin QFN (6 x 6 mm) : 8-output
• 32-pin QFN (5 x 5 mm) : 4-output
• 20-pin QFN (3 x 3 mm) : 2-output
• Pb-free, RoHS-6 compliant
2
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
Rev. 1.0 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 2, 2021
2
Data Sheet • Ordering Guide
2. Ordering Guide
Table 2.1. Si522x Ordering Guide
Number of Outputs
Internal Termination
100 Ω
12-output
85 Ω
Part Number
Si52212-A01AGM
Si52212-A01AGMR
Si52212-A02AGM
Si52212-A02AGMR
Si52208-A01AGM
Si52208-A01AGMR
Si52208-A02AGM
Si52208-A02AGMR
Si52204-A01BGM
Si52204-A01BGMR
Si52204-A02BGM
Si52204-A02BGMR
Si52202-A01BGM
Si52202-A01BGMR
Si52202-A02BGM
Si52202-A02BGMR
Package Type
64-QFN
64-QFN - Tape and Reel
64-QFN
64-QFN - Tape and Reel
48-QFN
48-QFN - Tape and Reel
48-QFN
48-QFN - Tape and Reel
32-QFN
32-QFN - Tape and Reel
32-QFN
32-QFN - Tape and Reel
20-QFN
20-QFN - Tape and Reel
20-QFN
20-QFN - Tape and Reel
Temperature
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
Extended, –40 to 85 °C
100 Ω
8-output
85 Ω
100 Ω
4-output
85 Ω
100 Ω
2-output
85 Ω
2.1 Technical Support
Table 2.2. Technical Support URLs
PCIe Clock Jitter Tool
PCIe Learning Center
Development Kit
https://www.skyworksinc.com/en/Products/Timing
https://www.skyworksinc.com/en/application-pages/pci-express-learning-center
https://www.skyworksinc.com/en/products/timing/evaluation-kits/clock/si52204-evaluation-
kit
3
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Rev. 1.0 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 2, 2021
3
Table of Contents
1. Feature List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Ordering Guide
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. 3
2.1 Technical Support .
3. Functional Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5. Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Crystal Recommendations .
5.2 Crystal Loading .
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5.3 Calculating Load Capacitors
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20
.20
.20
.21
.22
.22
.23
.23
.23
.23
.24
.24
.24
.24
.25
5.4 Power Supply Filtering Recommendations.
5.5 PWRGD/PWRDNb (Power Down) Pin .
5.6 PWRDNb (Power Down) Assertion .
5.8 OEb Pin .
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5.7 PWRDNb (Power Down) Deassertion .
5.9 OEb Assertion .
5.11 FS Pin
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5.10 OEb Deassertion .
5.12 SS_EN Pin .
5.14 REF/SA Pin
5.13 Recommendations for Driving Tri-State Pins
6. Test and Measurement Setup . . . . . . . . . . . . . . . . . . . . . . . .
7. PCIe Clock Jitter Tool . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. Control Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 I
2
C Interface .
8.3 Block Read .
8.4 Block Write .
8.6 Byte Read
8.7 Byte Write
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8.2 Block Read/Write .
26
28
29
.29
.29
.29
.30
.30
.30
.31
.32
.34
.34
.37
.40
8.5 Byte Read/Write
8.8 Data Protocol
8.9 Register Tables . . .
8.9.1 Si52212 Registers
8.9.2 Si52208 Registers
8.9.3 Si52204 Registers
4
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4
8.9.4 Si52202 Registers .
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.43
9. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1 Si52212 Pin Descriptions
9.2 Si52208 Pin Descriptions
9.3 Si52204 Pin Descriptions
9.4 Si52202 Pin Descriptions
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46
.46
.49
.52
.54
10. Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.1 Si52212 Package
10.3 Si52208 Package
10.5 Si52204 Package
10.7 Si52202 Package
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10.2 Si52212 Land Pattern .
10.4 Si52208 Land Pattern .
10.6 Si52204 Land Pattern .
10.8 Si52202 Land Pattern .
10.9 Si52212 Top Markings .
10.10 Si52208 Top Markings
10.11 Si52204 Top Markings
10.12 Si52202 Top Markings
56
.56
.57
.58
.59
.60
.62
.63
.65
.66
.67
.68
.69
11. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
70
5
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
Rev. 1.0 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 2, 2021
5
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