DSC557-0334FI1

Overview

The DSC557-0334FI1 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 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 an exposed pad.

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 differential outputs in HCSL or LVDS formats
• Features Output Enable/Disable control via the OE pin

Applications

• Ethernet (1G, 10GBASE-T/KR/LR/SR) and FcoE systems
• Storage Area Networks (SAN), Network Attached Storage (NAS), SSDs, and JBODs
• Routers, switches, gateways, VoIP devices, and wireless access points
• Industrial, medical, avionics, security systems, and digital signage applications

Procurement Notes

Verify the specific suffix 'I' corresponds to the Industrial temperature grade (-40°C to +85°C) and 'FI' indicates the 14-Lead QFN package with HCSL outputs as per the product identification system. Confirm packaging options such as tubes or tape/reel availability directly with the manufacturer or authorized distributors, as standard packaging quantities may vary.

Selection Notes

Select this model when designing for PCIe Gen1 to Gen4 interfaces requiring low jitter and high reliability. Ensure the design accommodates the 2.25V to 3.6V supply range and filters VDD pins with a 0.1 μF capacitor. Consider the 14-pin QFN footprint dimensions (2.5 mm x 3.2 mm) for PCB layout constraints and verify thermal requirements for the exposed pad.

Part Context

This component belongs to the DSC557 family of MEMS-based clock generators designed to replace quartz oscillators. The DSC557-03 variant specifically provides two differential outputs. Other variants in the family include the DSC557-04 (three outputs) and DSC557-05 (four outputs), which utilize a 20-pin package. The integrated MEMS technology offers superior shock and vibration immunity compared to traditional crystal solutions.

Replacement Considerations

The datasheet notes that the DSC557-03 can serve as a direct replacement for existing ICS557-03 clock generators. When substituting, ensure the target application supports the HCSL or LVDS output format provided by this specific part number.