8T49N285-998NLGI

Overview

The Renesas 8T49N285-998NLGI is a FemtoClock NG Universal Frequency Translator (UFT) designed as a clock synthesizer and jitter cleaner. It complies with GR.1244 Stratum standards for network synchronization applications. The device integrates a fractional-feedback PLL to translate input frequencies into precise output clocks while attenuating phase noise. It supports multiple differential output formats, including LVPECL and LVDS, allowing flexible configuration for high-speed digital interfaces in telecommunications and datacom infrastructure.

Feature Summary

• Compliant with Telcordia GR.1244 Stratum timing standards
• Integrates fractional-feedback PLL for frequency translation and jitter attenuation
• Supports multiple output voltage levels including LVPECL and LVDS
• Programmable via I2C interface for custom frequency configurations

Applications

• SONET/SDH network line cards
• Carrier Ethernet switches
• Synchronous Ethernet (SyncE) equipment
• OTN transport systems

Procurement Notes

Verify the specific suffix '998' against the official datasheet to confirm factory pre-programmed register settings and boot behavior. Packaging quantities vary by distributor; standard reel counts are typically 3000 units. Confirm RoHS compliance status and moisture sensitivity level (MSL) ratings prior to assembly planning.

Selection Notes

Select this component when GR.1244 Stratum compliance is required for network synchronization. Ensure the input reference frequency range matches the available system clock sources. Verify that the supported output drive strengths for LVPECL/LVDS meet the load requirements of the downstream receivers.

Part Context

This part belongs to the 8T49N285A FemtoClock NG family, which provides universal frequency translation capabilities. It serves as a replacement for legacy SONET/SDH clock generators, offering lower jitter performance and greater flexibility through programmable I2C registers compared to fixed-function alternatives.

Replacement Considerations

Direct pin-to-pin replacements within the same family include variants such as the 8T49N285A-018NLGI. Cross-model substitution requires careful verification of output count, voltage levels, and PLL architecture compatibility.