DSC557-0344FL1

Overview

The DSC557-0344FL1 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 supports PCIe Gen1 through Gen4 specifications and features HCSL output formats on both channels. It operates within a supply voltage range of 2.25V to 3.6V and is housed in a compact 14-VFQFN package (2.5x3.2 mm). Designed for extended industrial applications, it functions reliably between -40°C and +105°C.

Feature Summary

• Complies with PCIe Gen1/2/3/4 Common Clock Specifications
• Integrated MEMS Resonator eliminates the need for an external 25 MHz crystal
• Two-channel 100 MHz HCSL differential outputs with Output Enable/Disable control
• Qualified to MIL-STD-883 standards for excellent shock and vibration immunity

Applications

• Ethernet communications including 1G, 10GBASE-T/KR/LR/SR, and FcoE
• Storage area networks (SAN), network attached storage (NAS), SSDs, and JBOD systems
• Industrial, medical, avionics, security systems, and office automation embedded applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's Product Identification System to confirm output format, temperature grade, and packaging media. The 'L' suffix indicates Extended Industrial temperature range (-40°C to +105°C), while '44' denotes dual HCSL outputs. Confirm whether the required quantity necessitates tube or tape-and-reel packaging options available for this component family.

Selection Notes

Select this component when designing systems requiring low-jitter differential clocks for PCIe interfaces without external crystals. Ensure the design accommodates the 14-VFQFN footprint and provides adequate power supply filtering with a 0.1 μF capacitor as specified. Consider alternative output formats like LVDS or LVCMOS if the target application requires different logic levels than the default HCSL configuration.

Part Context

This part belongs to the DSC557-03 family of two-output PCIe clock generators. It serves as a direct replacement for legacy quartz-based oscillators such as the ICS557-03, offering reduced board space and improved reliability. The device integrates PLL circuitry and MEMS resonators to provide stable timing solutions for high-speed serial communication protocols.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source documentation.