DSC557-0344FI0

Overview

The DSC557-0344FI0 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 25 MHz crystal. The device operates within a supply voltage range of 2.25V to 3.6V and supports PCIe Gen1 through Gen4 common clock specifications. Packaged in a space-saving 14-VFQFN (2.5x3.2 mm) with an exposed pad, it functions reliably across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Complies with PCIe Gen1/2/3/4 Common Clock Specifications
• Integrated MEMS Resonator eliminates the need for an external 25 MHz crystal
• Two Output Enable/Disable feature allows control via the OE pin
• Qualified to MIL-STD-883 for excellent shock and vibration immunity

Applications

• Communications and Networking: Ethernet, Routers, Switches, VoIP, Wireless APs
• Storage Systems: SAN, NAS, SSD, JBOD
• Embedded Applications: Industrial, Medical, Avionics, Security Systems

Procurement Notes

Verify the specific ordering suffix 'I' confirms the -40°C to +85°C industrial temperature grade and ±100 ppm frequency stability as defined in the Product Identification System. Confirm the package marking includes the Pb-free JEDEC designator. Ensure the supplier provides the official datasheet DS20006318A for final electrical parameter validation before integration.

Selection Notes

Select this component when designing systems requiring compliance with PCIe Gen1 through Gen4 standards. The integrated MEMS resonator simplifies the design by removing the external crystal requirement. Verify that the 14-QFN footprint matches the PCB land pattern recommendations. Consider the output enable functionality if dynamic clock gating is required for power management.

Part Context

This part belongs to the DSC557-03 family of two-output PCIe clock generators. It serves as a direct replacement for legacy quartz-based solutions like the IC557-03, offering improved reliability and reduced board space. The '44' suffix indicates both CLK0 and CLK1 outputs are configured for HCSL signaling.

Replacement Considerations

The datasheet explicitly states the device can directly replace existing IC557-03 clocks. When substituting older quartz oscillators, verify that the new MEMS-based jitter performance meets the specific requirements of the target PCIe generation.