DSC557-0333FL0

Overview

The DSC557-0333FL0 is a two-output PCI Express clock generator from the DSC557-03 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 features LVDS output formats for both CLK0 and CLK1, operates within a supply voltage range of 2.25V to 3.6V, and supports PCIe Gen1 through Gen4 specifications. It is housed in a compact 14-VFQFN package with an exposed pad, designed for surface mount installation.

Feature Summary

• Integrated MEMS resonator eliminates the need for an external quartz crystal
• Complies with PCIe Gen1, Gen2, Gen3, and Gen4 common clock specifications
• LVDS output format available for both differential output pairs
• Output Enable/Disable feature allows control via the OE pin

Applications

• PCI Express (PCIe) systems requiring Gen1-Gen4 timing
• Communications and networking equipment such as routers and switches
• Storage solutions including SAN, NAS, SSD, and JBOD arrays
• Embedded applications in industrial, medical, and avionics sectors

Procurement Notes

Verify the specific ordering suffix '33' confirms dual LVDS outputs and 'L' indicates the extended industrial temperature range (-40°C to +105°C). Confirm the package type matches the 14-Lead QFN (2.5 mm x 3.2 mm) dimensions. Ensure compatibility with the required frequency stability of ±100 ppm or ±50 ppm depending on the full part number designation.

Selection Notes

Select this component when a crystal-free solution is required for PCIe designs to enhance reliability against shock and vibration. Choose the LVDS output variant if the target system requires low-voltage differential signaling. Verify that the operating temperature range meets the environmental requirements of the final application, specifically the extended industrial grade indicated by the suffix.

Part Context

This device belongs to the DSC557 family of MEMS-based clock generators. It serves as a direct replacement for traditional quartz oscillators, offering improved mechanical robustness and lower power consumption. The DSC557-03 specifically provides two independent differential outputs, making it suitable for multi-lane PCIe interfaces.

Replacement Considerations

The datasheet notes that the DSC557-03 can directly replace existing ICS557-03 clock generators. Designers should verify pinout compatibility and ensure that the new LVDS or HCSL output levels match the input requirements of the downstream PCIe components.