DSC557-0344FI0T

Overview

The DSC557-0344FI0T is a two-output PCI Express clock generator from the DSC557-03 series, manufactured by Microchip Technology. It utilizes silicon MEMS technology to provide 100 MHz differential clocks compliant with PCIe Gen1 through Gen4 specifications. The device features HCSL output formats on both channels and operates within a supply voltage range of 2.25V to 3.6V. Designed for industrial applications, it supports an operating temperature range of -40°C to +85°C. The component is housed in a compact 14-VFQFN package measuring 2.5x3.2 mm and includes an integrated PLL.

Feature Summary

• Complies with PCIe Gen1/2/3/4 Common Clock Specifications
• Integrated MEMS Resonator eliminates external 25 MHz crystal requirements
• Dual 100 MHz HCSL outputs with Output Enable/Disable functionality
• Qualified to MIL-STD-883 for shock and vibration immunity

Applications

• Ethernet (1G, 10GBASE-T/KR/LR/SR, FcoE)
• Storage Area Networks (SAN), Network Attached Storage (NAS), SSDs
• Industrial, Medical, and Avionics embedded systems

Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature grade (-40°C to +85°C) and 'FI' indicates the 14-QFN package with HCSL outputs. Confirm the 'T' suffix corresponds to Tape & Reel packaging as per the product identification system. Ensure compatibility with the required frequency stability of ±100 ppm.

Selection Notes

Select this model when dual HCSL outputs are required for PCIe Gen1-4 designs. The 14-QFN package offers significant space savings compared to larger packages. Consider the LVDS or LVCMOS variants if different output logic levels are needed. Verify that the ±100 ppm frequency stability meets the system jitter and timing requirements.

Part Context

This part belongs to the DSC557-03 family of two-output PCIe clock generators. It serves as a direct replacement for legacy crystal-based solutions like the ICS557-03. The device integrates the resonator and PLL, reducing board complexity and improving reliability against mechanical stress compared to traditional quartz oscillators.

Replacement Considerations

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