DSC557-0344FI1

Overview

The DSC557-0344FI1 is a two-output PCI Express clock generator from Microchip Technology, designed for PCIe Gen1 through Gen4 applications. It utilizes silicon MEMS technology to generate a stable 100 MHz differential clock without requiring an external 25 MHz crystal. The device operates within a supply voltage range of 2.25V to 3.6V and supports HCSL output formats on both channels. It features an integrated PLL and includes an Output Enable (OE) pin for controlling signal states. The component is housed in a compact 14-VFQFN package with dimensions of 2.5 mm x 3.2 mm.

Feature Summary

• Complies with PCIe Gen1/2/3/4 Common Clock specifications
• Integrated MEMS resonator eliminates the need for an external 25 MHz crystal
• Supports HCSL, LVDS, and LVCMOS output formats
• Includes dedicated Output Enable (OE) pin for disabling outputs

Applications

• Ethernet (1G, 10GBASE-T/KR/LR/SR, FcoE)
• Storage Area Networks (SAN), Network Attached Storage (NAS), SSD, JBOD
• Industrial, Medical, and Avionics embedded systems

Procurement Notes

Verify the specific suffix 'I' indicates the Industrial temperature grade (-40°C to +85°C) and '44' denotes dual HCSL outputs as per the product identification system. Confirm packaging details such as tube quantity (110 units) against current distributor listings. Ensure compatibility with the required frequency stability of ±100 ppm for the target application environment.

Selection Notes

Select this model when a two-channel differential clock source is required for PCIe interfaces. The choice between HCSL, LVDS, or LVCMOS depends on the receiver input requirements of the connected components. Verify that the operating temperature range meets the environmental constraints of the final assembly, noting that other suffixes exist for Extended Industrial and Commercial grades.

Part Context

This component belongs to the DSC557-03 series, which provides two-output MEMS-based clock solutions. It serves as a direct replacement for quartz-based oscillators in high-reliability designs. The series is part of Microchip's broader portfolio of PCI Express timing solutions, offering improved shock and vibration immunity compared to traditional SAW or quartz technologies.

Replacement Considerations

The datasheet notes that the DSC557-03 can directly replace existing ICS557-03 clocks due to pin compatibility. When substituting older quartz or SAW oscillators, verify that the new MEMS device's jitter performance meets the specific PCIe generation requirements of the design.