SI52204-A02AGMR

Overview

The Si52204-A02AGMR is a four-output PCIe clock generator from Skyworks Solutions, designed for 1.5 V to 1.8 V applications supporting Gen 1 through Gen 7 standards. It provides four 100 MHz differential LP-HCSL outputs and one 25 MHz LVCMOS reference clock. The device features internal 85 Ω line matching, adjustable output slew rates, and spread spectrum capabilities (0.25% or 0.5%) for EMI reduction. Control is managed via individual hardware pins or I²C interface. It operates within an extended temperature range of –40 °C to 85 °C.

Feature Summary

• Four differential LP-HCSL outputs compliant with PCIe Gen 1/2/3/4/5/6/7 specifications
• One non-spread 25 MHz LVCMOS reference clock output
• Internal 85 Ω impedance matching eliminates external resistors
• Spread spectrum enable/disable with selectable down-spread levels of 0.25% or 0.5%
• I²C support with read-back capabilities and individual hardware control pins for output enable and frequency select

Applications

• Servers
• Storage systems
• Data centers
• PCIe add-on cards
• Network Interface Cards (NICs)

Procurement Notes

Verify the specific ordering suffix 'R' indicates reel packaging when sourcing components. Confirm RoHS compliance status through the manufacturer's certificate of conformance. Ensure the design supports the required 1.5 V to 1.8 V supply voltage range and utilizes the appropriate 32-pin QFN footprint for thermal management.

Selection Notes

Select this model for designs requiring exactly four differential PCIe clock outputs. Compare against the Si52202 (two outputs) or Si52208 (eight outputs) if port counts differ. Verify that the internal 85 Ω termination matches the target PCB trace impedance requirements. Check if Wake-on LAN functionality is needed, as it requires specific power-down configuration settings.

Part Context

This component belongs to the Si522xx family, which includes the Si52212, Si52208, and Si52202 variants. These devices share a common architecture optimized for low power consumption and small form factors. The Si52204 specifically occupies the mid-range of the portfolio with its 32-pin QFN package, balancing output count and board space efficiency.

Replacement Considerations

Direct pin-compatible replacements within the same family include the Si52208 (higher output count) or Si52202 (lower output count), provided the additional or missing outputs are not utilized in the current design. Verify that any substitute maintains the same 85 Ω internal termination and voltage specifications.