DSC557-0344FE1

Overview

The DSC557-0344FE1 is a two-output PCI Express clock generator from Microchip Technology, utilizing silicon MEMS technology to eliminate the need for external quartz crystals. It provides 100 MHz differential HCSL outputs compliant with PCIe Gen1 through Gen4 common clock specifications. The device operates within a supply voltage range of 2.25V to 3.6V and supports an extended commercial temperature range of -20°C to +70°C. Packaged in a compact 14-VFQFN (2.5x3.2 mm) format, it features an output enable pin for power management and offers low jitter performance suitable for high-speed data communication applications.

Feature Summary

• Complies with PCIe Gen1/2/3/4 Common Clock Specifications
• Integrated MEMS Resonator eliminates external 25 MHz crystal requirements
• Two-output 100 MHz HCSL configuration with Output Enable functionality
• Space-saving 14-Lead QFN package (2.5 mm x 3.2 mm)

Applications

• Ethernet (1G, 10GBASE-T/KR/LR/SR)
• Storage Area Networks (SAN), Network Attached Storage (NAS), SSDs
• Routers, Switches, Gateways, and VoIP systems

Procurement Notes

Verify the specific ordering suffix FE1 against the manufacturer's Product Identification System documentation to confirm the exact temperature grade (-20°C to +70°C), frequency stability (±100 ppm), and media type (Tube). Ensure compatibility with the required PCB land pattern for the 14-VFQFN exposed pad package during procurement planning.

Selection Notes

Select this component when designing for PCIe Gen1 to Gen4 interfaces requiring a dual 100 MHz differential clock source without external crystals. The -20°C to +70°C temperature rating suits commercial-grade environments. Consider alternative suffixes if industrial (-40°C to +85°C) or extended industrial (-40°C to +105°C) operating ranges are required for the application.

Part Context

This part belongs to the DSC557-03 series, which includes variants with different output formats such as LVDS and LVCMOS. The '44' suffix indicates both outputs are configured as HCSL. Other series members like DSC557-04 and DSC557-05 offer three and four outputs respectively, housed in larger 20-pin packages.

Replacement Considerations

Direct replacements include other DSC557-03 variants with matching output formats and temperature grades. Cross-family substitutes may include older quartz-based oscillators like the ICS557-03, though these require external crystals and occupy more board space.