DSC557-0344FI1T

Overview

The DSC557-0344FI1T 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 HCSL outputs without requiring an external crystal. The device complies with PCIe Gen1 through Gen4 common clock specifications and features an integrated PLL. It operates on a supply voltage of 2.25V to 3.6V within an industrial temperature range of -40°C to +85°C. Packaged in a space-saving 14-VFQFN (2.5 mm x 3.2 mm) with an exposed pad, it offers low power consumption and high shock and vibration immunity.

Feature Summary

• Two-output PCIe clock generator compliant with Gen1/2/3/4 specifications
• Integrated MEMS resonator eliminates need for external 25 MHz crystal
• Dual HCSL outputs at 100 MHz with excellent jitter performance
• Industrial temperature range (-40°C to +85°C) and 2.25V–3.6V supply

Applications

• PCIe-based storage systems including SAN, NAS, SSD, and JBOD
• Networking equipment such as routers, switches, gateways, and VoIP devices
• Embedded applications in industrial, medical, and avionics sectors

Procurement Notes

Verify the specific ordering suffix 'I' confirms the -40°C to +85°C industrial temperature rating and 'T' indicates tape-and-reel packaging. Confirm the '44' code specifies dual HCSL output formats. Ensure compatibility with the 14-VFQFN footprint during procurement planning.

Selection Notes

Select this component when designing PCIe Gen1 to Gen4 interfaces requiring a crystal-less solution. The dual HCSL outputs are suitable for standard logic families. Consider the ±100 ppm frequency stability and MIL-STD-883 qualified shock/vibration immunity for robust environments. Verify that the 14-pin QFN package dimensions fit the PCB layout constraints.

Part Context

This part belongs to the DSC557-03 family of two-output PCIe clock generators. It serves as a direct replacement for older quartz-based solutions like the ICS557-03, offering reduced board space and improved reliability due to the absence of fragile mechanical crystals.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout and electrical compatibility if considering alternative MEMS clock generators from other manufacturers.