DSC557-04444KI1T

Overview

The DSC557-04444KI1T is a crystal-less, three-output PCI Express clock generator utilizing silicon MEMS technology. It meets PCIe Gen1, Gen2, and Gen3 specifications with a maximum frequency of 460 MHz. The device features HCSL outputs, operates on a 2.25V to 3.6V supply, and supports an industrial temperature range of -40°C to 85°C. Packaged in a 20-VFQFN (5x3.2mm) exposed pad, it includes integrated PLLs for stability without external quartz crystals.

Feature Summary

• Crystal-less design using proven silicon MEMS technology
• Three differential outputs compliant with PCIe Gen1, Gen2, and Gen3 standards
• HCSL output format with mixed format support options
• Output Enable/Disable control via OE1 and OE2 pins

Applications

• Ethernet and networking equipment (Routers, Switches)
• Storage area networks (SAN, NAS, SSD)
• Embedded applications (Industrial, Medical, Avionics)

Procurement Notes

Verify the 'T' suffix indicates Tape & Reel packaging as per the ordering information section. Confirm the 'I' suffix corresponds to the -40°C to 85°C industrial temperature grade. Ensure the 'K' package designation matches the 20-QFN footprint requirements for your PCB layout.

Selection Notes

Select this model for designs requiring three synchronized PCIe clocks without external crystals. Verify that the HCSL output format aligns with downstream receiver requirements. Check if the ±100ppm stability meets system jitter budgets. Consider the 20-QFN thermal pad connection for optimal heat dissipation during operation.

Part Context

This component belongs to the DSC557-04 series of Crystal-less™ PCIe clock generators. It replaces traditional quartz oscillators to improve reliability and reduce board space. The part integrates MEMS resonators and PLL circuitry into a single surface-mount package.

Replacement Considerations

Direct pin-compatible replacements within the same family include variants with different temperature grades or output formats. Cross-referencing with older ICS557-03 devices may require level shifting adjustments due to voltage differences.