SI52131-A11AGMR

Overview

The SI52131-A11AGMR is a PCIe clock generator providing two differential outputs and one buffered single-ended reference clock. It accepts a 25 MHz crystal or clock input to generate compliant frequencies for PCIe Gen 1, Gen 2, and Gen 3 specifications. The device operates on a 3.3 V supply with a dynamic current of 45 mA. Key electrical parameters include a cycle-to-cycle jitter of 50 ps maximum for differential outputs and a long-term accuracy of 100 ppm. It features pin-selectable frequency options (100, 125, 200 MHz) and spread spectrum control via SS pins, housed in a 24-pin QFN package.

Feature Summary

• Generates two differential PCIe clocks and one 25 MHz reference clock from a 25 MHz source
• Compliant with PCIe Gen 1, Gen 2, and Gen 3 specifications
• Pin-selectable output frequencies: 100 MHz, 125 MHz, and 200 MHz
• Supports triangular spread spectrum modulation (-0.5% down spread) for EMI reduction
• Includes dedicated active low output enable pins for each output

Applications

• PCI-Express compliant systems
• Network Attached Storage (NAS)
• Multi-function printers
• Wireless access points
• Routers

Procurement Notes

Verify the 'R' suffix indicates tape and reel packaging rather than tray packaging. Confirm the specific revision code matches the design requirements. Ensure the extended temperature range (-40°C to +85°C) aligns with the target environment. Check for moisture sensitivity classification prior to soldering.

Selection Notes

Select this component when dual differential PCIe clocks and a separate 25 MHz reference are required from a single chip. Verify that the 24-pin QFN footprint fits the PCB layout constraints. Consider the I2C interface if software-controlled amplitude adjustment or output enabling is needed beyond hardware pin selection.

Part Context

The SI52131-A11AGMR belongs to the Skyworks Si52131 family of high-performance clock generators. It is functionally identical to the SI52131-A11AGM but differs in shipping configuration, utilizing tape and reel packaging suitable for automated surface-mount assembly processes.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.