DSC557-053344KL1T

Overview

The DSC557-053344KL1T is a Crystal-less™ four-output PCI Express clock generator utilizing silicon MEMS technology. It meets Gen1, Gen2, and Gen3 specifications with a maximum frequency of 100MHz. The device operates on a 2.25V to 3.6V supply within an extended industrial temperature range of -40°C to 105°C. It features HCSL and LVDS output formats, a 0:4 input-to-output ratio, and a 20-VFQFN package. Integrated PLL functionality provides excellent jitter stability without requiring an external quartz crystal.

Feature Summary

• Crystal-less design using silicon MEMS technology for enhanced reliability
• Four differential outputs compliant with PCIe Gen1, Gen2, and Gen3 standards
• Output Enable/Disable control via OE1 and OE2 pins
• Qualified to MIL-STD-883 for shock and vibration immunity

Applications

• Ethernet (1G, 10GBASE-T/KR/LR/SR)
• Storage Area Networks (SAN) and Network Attached Storage (NAS)
• Routers, Switches, and Gateways
• Solid State Drives (SSD)

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm output format codes and temperature grades. Confirm package availability and lead times directly with authorized distributors or the manufacturer. Ensure compliance with RoHS and REACH regulations as specified in the product documentation.

Selection Notes

Select this component for applications requiring low-jitter PCIe timing without external crystals. Verify that the required output voltage levels match the available HCSL and LVDS options. Check if the -40°C to 105°C temperature range meets system requirements. Consider the 20-pin QFN footprint for PCB layout constraints.

Part Context

This part belongs to the DSC557-05 series of Crystal-less PCIe clock generators. It replaces traditional quartz oscillators with MEMS technology to improve reliability and reduce board space. The series supports various output combinations including LVPECL, LVDS, and HCSL across different temperature grades.

Replacement Considerations

Direct substitutes include other DSC557-05 variants with different output format suffixes or temperature ranges. Cross-referencing with DSA557 models may be necessary for similar PCIe timing solutions with different pin counts or output configurations.

FAQ

How are the four outputs controlled?

Outputs are controlled by two enable pins, OE1 and OE2. OE1 controls CLK0 and CLK1, while OE2 controls CLK2 and CLK3. Setting both pins low disables all outputs.

What is the startup time for the device?

The startup time (tSU) to reach a stable 100PPM output frequency after VDD application and enabling is typically 5 ms at 25°C.

Does the device require an external crystal?

No, the DSC557-05 uses integrated silicon MEMS technology and does not require an external quartz crystal.