8T49N282C-999NLGI8

Overview

The 8T49N282C-999NLGI8 is a FemtoClock NG Octal Universal Frequency Translator manufactured by Renesas Electronics Corporation. It features two independent fractional-feedback PLLs capable of jitter attenuation and frequency translation. The device generates up to eight output frequencies ranging from 8kHz to 1GHz using six integer and two fractional output dividers. It accepts up to four differential or single-ended input clocks plus a crystal input, supporting LVPECL, LVDS, LVHSTL, HCSL, and LVCMOS levels. Powered by 2.375V to 3.465V supplies, it operates within -40°C to 85°C ambient temperature in a 72-VFQFN exposed pad package.

Feature Summary

• Dual independent fractional-feedback PLLs with programmable loop bandwidth (0.5Hz to 512Hz) for jitter attenuation and frequency translation.
• Generates up to eight output frequencies (8kHz to 1GHz) via six integer and two fractional dividers; supports LVPECL, LVDS, and LVCMOS outputs.
• Accepts up to four input clocks (8kHz to 875MHz) and a crystal input with automatic/manual hitless switching and Loss-of-Signal monitoring.
• Supports holdover with initial accuracy of ±50ppb and programmable output phase alignment in steps as small as 16ps.

Applications

• OTN or SONET/SDH equipment line cards including ITU-T G.709 FEC rates
• Gigabit and Terabit IP switches/routers supporting Synchronous Ethernet
• Wireless base station baseband units

Procurement Notes

Verify the component status as End-of-Life (EOL) based on Product Change Notices dated May 2019 and July 2025. Confirm availability through authorized distributors or alternative sources, as standard manufacturing has ceased. Ensure compliance with RoHS 6 specifications and check Moisture Sensitivity Level (MSL) ratings prior to procurement.

Selection Notes

Select this component for applications requiring dual independent clock domains with high-frequency translation capabilities. Ensure the design accommodates the 72-VFQFN package dimensions and thermal requirements. Verify that the required output voltage levels (LVPECL, LVDS, or LVCMOS) match the available VCCO supply configurations. Confirm that the I2C/SPI programming interface aligns with the system control architecture.

Part Context

This part belongs to the FemtoClock NG family of universal frequency translators. It is designed for high-performance timing applications where precise frequency synthesis and jitter attenuation are critical. The device integrates multiple output drivers and flexible input options to support complex network synchronization requirements.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material. Consult manufacturer documentation for current alternatives or obsolescence management strategies.