DSC557-0333FI1

Overview

The DSC557-0333FI1 is a two-output PCI Express clock generator from Microchip Technology, designed for PCIe Gen1 through Gen4 applications. Utilizing silicon MEMS technology, it eliminates the need for an external 25 MHz crystal. The device provides a 100 MHz differential output with LVDS signaling on both channels (CLK1 and CLK0). It operates within a supply voltage range of 2.25V to 3.6V and supports an industrial temperature range of -40°C to +85°C. The component is housed in a compact 14-VFQFN package measuring 2.5 mm x 3.2 mm.

Feature Summary

• Complies with PCIe Gen1/2/3/4 Common Clock specifications
• Integrated MEMS resonator removes requirement for external crystals
• Dual LVDS outputs at 100 MHz with Output Enable/Disable functionality
• Qualified to MIL-STD-883 standards for shock and vibration immunity

Applications

• Ethernet networking equipment including routers and switches
• Storage area networks (SAN) and network-attached storage (NAS)
• Industrial and medical embedded systems
• Security systems and office automation devices

Procurement Notes

Verify the specific ordering suffix against the manufacturer's Product Identification System to confirm output formats and packaging media. The 'I' suffix indicates the Industrial temperature grade (-40°C to +85°C), while '33' specifies LVDS outputs for both channels. Confirm whether the required quantity corresponds to tube or tape-and-reel packaging options available for this series.

Selection Notes

Select this model when dual differential LVDS clocks are required for PCIe compliant designs. Ensure the system power supply remains within the 2.25V to 3.6V operating range. Verify that the 14-VFQFN footprint matches the PCB layout constraints, as the exposed pad requires proper thermal management and grounding recommendations.

Part Context

This component belongs to the DSC557 family of silicon MEMS clock generators. It serves as a direct replacement for legacy quartz-based oscillators like the ICS557-03, offering improved reliability and reduced board space. The device integrates PLL circuitry and a MEMS resonator to generate stable timing signals without external frequency-determining components.

Replacement Considerations

The datasheet identifies the ICS557-03 as a compatible existing part for direct substitution. When replacing older quartz solutions, verify that the target application can accommodate the new package dimensions and pinout configuration of the 14-Lead QFN form factor.