DSC557-0343FI1T

Overview

The DSC557-0343FI1T is a two-output PCI Express clock generator from the DSC557 series, manufactured by Microchip Technology. It utilizes silicon MEMS technology to generate a 100 MHz differential clock signal without requiring an external crystal. The device supports PCIe Gen1 through Gen4 specifications and offers flexible output configurations, specifically HCSL for CLK1 and LVDS for CLK0 in this variant. Operating within a supply voltage range of 2.25V to 3.6V, it functions across an industrial temperature range of -40°C to +85°C. The component is housed in a compact 14-VFQFN package with dimensions of 2.5 mm x 3.2 mm.

Feature Summary

• Integrated MEMS resonator eliminates the need for an external 25 MHz crystal
• Complies with PCIe Gen1/2/3/4 Common Clock Specification
• Supports mixed output formats including HCSL and LVDS
• Output Enable/Disable feature allows control via OE pin

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 'FI1T' against official documentation to confirm the combination of Industrial temperature grade (-40°C to +85°C), ±100 ppm frequency stability, and Tape & Reel packaging quantity of 1,000 units. Ensure compatibility with the required HCSL and LVDS output formats before procurement.

Selection Notes

Select this model when a dual-output PCIe clock source is required with mixed logic levels. The 'I' suffix indicates the Industrial temperature range, while 'F' denotes the 14-lead QFN package. Confirm that the HCSL and LVDS output configuration meets the interface requirements of the target PCIe slots or controllers.

Part Context

This part belongs to the DSC557-03 family, which provides two outputs. Other variants in the series include models with different output combinations such as dual HCSL or dual LVDS, and packages like the 16-pin TSSOP. The DSC557 series serves as a replacement for quartz oscillators in high-reliability applications.

Replacement Considerations

The datasheet notes that the DSC557-03 can directly replace existing ICS557-03 clock generators. Verify pinout compatibility and electrical characteristics when substituting other MEMS clock generators.