DSC557-0344FL1T

Overview

The DSC557-0344FL1T 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 outputs compliant with PCIe Gen1 through Gen4 specifications. The device operates on a supply voltage of 2.25V to 3.6V and features HCSL output formats for both channels. Packaged in a space-saving 14-VFQFN (2.5x3.2 mm) case, it eliminates the need for an external 25 MHz crystal. The unit supports an extended industrial temperature range of -40°C to +105°C and includes an active-high Output Enable function.

Feature Summary

• Complies with PCIe Gen1/2/3/4 Common Clock specifications
• Integrated MEMS resonator eliminates external quartz crystal requirements
• Dual 100 MHz HCSL differential outputs with OE control
• Qualified to MIL-STD-883 for shock and vibration immunity

Applications

• Ethernet (1G, 10GBASE-T/KR/LR/SR, FcoE)
• Storage Area Networks (SAN), Network Attached Storage (NAS), SSDs
• Routers, Switches, Gateways, VoIP systems, and Wireless Access Points
• Industrial, Medical, and Avionics embedded applications

Procurement Notes

Verify that the 'T' suffix indicates tape and reel packaging containing 1,000 units per manufacturer standard. Confirm the 'L' designation corresponds to the extended industrial temperature grade (-40°C to +105°C). Ensure the '44' code matches the required dual HCSL output configuration. Cross-reference the specific datasheet revision DS20006318A for final electrical parameter validation before integration.

Selection Notes

Select this component when designing systems requiring compliance with PCIe Gen1 through Gen4 common clock architectures. The integrated MEMS technology offers superior shock and vibration immunity compared to traditional quartz oscillators. Verify that the 14-VFQFN package dimensions fit the PCB layout constraints. Ensure the power supply filtering meets the requirement of a 0.1 μF capacitor on the VDD pin for stable operation.

Part Context

This part belongs to the DSC557-03 family of two-output PCIe clock generators. It serves as a direct replacement for legacy devices like the ICS557-03 while offering reduced board space consumption. The family provides various output format combinations including LVDS and LVCMOS options alongside the HCSL variant found in this specific model.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.