DSC557-0343FI1

Overview

The DSC557-0343FI1 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 25 MHz crystal. The device supports PCIe Gen1 through Gen4 specifications and offers HCSL and LVDS output formats. It operates within a supply voltage range of 2.25V to 3.6V and 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 2.5x3.2 mm.

Feature Summary

• Complies with PCIe Gen1/2/3/4 Common Clock Specifications
• Integrated MEMS Resonator eliminates the need for an external 25 MHz crystal
• Provides 100 MHz outputs in HCSL and LVDS formats
• Operates over an extended temperature range of -40°C to +85°C

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 against the manufacturer's Product Identification System documentation. Confirm that the 'I' suffix corresponds to the required -40°C to +85°C industrial temperature grade and that the '43' designation matches the desired HCSL and LVDS output configuration for your design requirements.

Selection Notes

Select this component when designing systems requiring low-jitter differential clocks for PCIe interfaces without the reliability risks associated with quartz crystals. Ensure the PCB layout accommodates the 14-QFN footprint and provides adequate thermal dissipation. Verify that the power supply filtering meets the datasheet recommendation of a 0.1 μF capacitor on the VDD pin.

Part Context

This part belongs to the DSC557 family of silicon MEMS clock generators designed to replace traditional quartz oscillators. The DSC557-03 variant specifically provides two independent output channels. It is engineered to offer superior shock and vibration immunity compared to mechanical resonators, making it suitable for demanding communication and storage environments.

Replacement Considerations

The DSC557-0343FI1 is functionally compatible with the ICS557-03 series as a direct replacement for existing quartz-based designs. When substituting, ensure the new MEMS device fits the same 14-pin QFN footprint and that the power supply decoupling strategy is maintained.