SI52138-A16AGM

Overview

The SI52138-A16AGM is a dual-output PCIe clock generator manufactured by Skyworks Solutions. Designed for PCI Express applications, it generates two differential clock outputs from a single crystal or external reference input. The device operates with a supply voltage of 3.3V and utilizes a QFN-24 package. It supports standard PCIe frequency requirements, providing low-jitter clock signals essential for high-speed serial interface compliance in computer motherboards and peripheral cards.

Feature Summary

• Dual-output architecture generating required PCIe differential clocks
• Supports input from 25 MHz crystal oscillator or external clock source
• Integrated voltage regulator for simplified power design
• Available in RoHS-compliant QFN-24 surface-mount package

Applications

• PCI Express root complex clock generation
• Peripheral slot clock distribution
• Computer motherboard chipset interfaces
• Add-in card clock synchronization

Procurement Notes

Verify the specific suffix A16AGM against the manufacturer's current datasheet to confirm pinout compatibility and electrical specifications. Check for recent Product Change Notifications (PCNs) regarding package updates or material changes. Ensure the supplier provides valid traceability documentation for quality assurance purposes before finalizing procurement orders.

Selection Notes

Select this component when a dual-output solution is sufficient for the target PCIe topology. Compare jitter performance metrics against system requirements to ensure signal integrity standards are met. Verify that the 3.3V operating voltage aligns with the system's power rail availability. Confirm package dimensions fit within the PCB layout constraints compared to alternative packages in the same series.

Part Context

This part belongs to the Skyworks SI521xx family of PCIe clock generators. The family includes variants with different output counts and configurations, such as the SI52131 which offers three outputs including a buffered reference. The SI52138 specifically targets applications requiring only two primary differential clock outputs, simplifying the design compared to multi-output alternatives.

Replacement Considerations

Direct replacements within the same family include the SI52131 if an additional buffered reference clock is needed. Cross-family alternatives may require verification of pin compatibility and jitter specifications. Always validate electrical parameters against the original design requirements before substituting.