844441DMI-300LF

Overview

The 844441DMI-300LF is a FemtoClock SAS/SATA clock generator IC designed for high-performance timing applications. It features a single LVPECL output with a maximum frequency of 300MHz. The device operates on a supply voltage range of 2.375V to 2.625V and supports surface mount installation in an 8-SOIC package. It functions within an operating temperature range of -40°C to 85°C, utilizing an external 25MHz parallel resonant crystal as the reference input.

Feature Summary

• Generates low jitter clock signals specifically optimized for SAS, SAS-2, and SATA CPU interfaces.
• Utilizes spread spectrum technology to reduce electromagnetic interference (EMI) in high-speed data transmission systems.
• Integrates a Phase-Locked Loop (PLL) circuit for stable frequency generation without requiring internal programmability.

Applications

• SAS controller clock generation
• SAS-2 interface timing
• SATA CPU clock distribution

Procurement Notes

Verify component authenticity through authorized Renesas distributors or certified suppliers. Confirm the specific suffix DMI-300LF matches required electrical specifications. Check for RoHS compliance status and ensure the 8-SOIC package dimensions align with PCB footprint requirements. Review datasheet revisions for any pinout or functional updates prior to integration.

Selection Notes

Select this component when a fixed 300MHz LVPECL output is required for SAS or SATA architectures. Ensure the design accommodates the specified 2.375V to 2.625V power rail. Consider the -40°C to 85°C industrial temperature range for environmental suitability. Verify that the external 25MHz crystal selection meets the load capacitance requirements defined in the official datasheet.

Part Context

This part belongs to the FemtoClock family of silicon timing products from Renesas Electronics. It is engineered for low jitter performance, distinguishing it from standard clock generators. The 844441 series is widely recognized in storage subsystem designs where precise timing and EMI reduction are critical for signal integrity.

Replacement Considerations

Consult the official Renesas cross-reference documentation for verified substitute part numbers. Ensure any replacement maintains the same 8-SOIC package and LVPECL output configuration. Verify compatibility with the existing 25MHz crystal reference circuit before implementation.

FAQ

What type of reference input does the 844441DMI-300LF require?

It requires an external 25MHz parallel resonant crystal as the reference input.

Is the output frequency programmable?

No, the 844441DMI-300LF provides a fixed 300MHz output frequency and is not internally programmable.