DSC557-054444KI1

Overview

The DSC557-054444KI1 is a four-output PCI Express clock generator utilizing silicon MEMS technology. It operates within a supply voltage range of 2.25V to 3.6V and supports frequencies up to 460MHz, with a typical output of 100MHz. The device features an HCSL output format and includes two independent output enable pins (OE1, OE2) that control banks of synchronous clocks. Designed for industrial applications, it functions reliably between -40°C and +85°C. The component eliminates the need for external quartz crystals, offering enhanced stability and shock immunity while meeting PCIe Gen1, Gen2, and Gen3 specifications.

Feature Summary

• Four differential outputs supporting mixed formats including HCSL, LVDS, and LVPECL
• Crystal-less design using proven silicon MEMS technology for improved reliability
• Compliance with PCIe Gen1, Gen2, and Gen3 jitter and timing specifications
• Independent output enable/disable functionality via OE1 and OE2 pins

Applications

• Ethernet routers, switches, and gateways
• Storage Area Networks (SAN), Network Attached Storage (NAS), and SSDs
• Industrial, medical, and avionics embedded systems
• Security systems and office automation equipment

Procurement Notes

Verify the specific ordering suffix 'I' confirms the -40°C to +85°C industrial temperature rating. Confirm the 'K' package designation corresponds to the 20-QFN form factor. Ensure the '4444' sequence matches the required HCSL output configuration for the target circuit design before finalizing procurement.

Selection Notes

Select this model when four synchronized PCIe clock signals are required without external crystal components. Verify that the HCSL output logic levels align with the input requirements of the downstream PCIe devices. Consider the 20-QFN footprint dimensions (5.0 x 3.2 mm) during PCB layout planning to ensure adequate clearance and thermal management.

Part Context

This part belongs to the DSC557-05 series of crystal-less PCIe clock generators. It serves as a direct replacement for traditional quartz-based oscillators in high-reliability communication and storage infrastructure. The MEMS architecture provides superior vibration resistance compared to mechanical resonators, making it suitable for mobile or harsh environment applications.

Replacement Considerations

Check pin compatibility if replacing legacy quartz oscillators. Ensure the new board layout accommodates the exposed pad thermal requirement on the 20-QFN package. Verify that the power supply decoupling strategy meets the datasheet recommendation of filtering each VDD pin with a 0.01µF capacitor.