8T49N282C-998NLGI8

Overview

The 8T49N282C-998NLGI8 is a FemtoClock NG Octal Universal Frequency Translator featuring two independent fractional-feedback PLLs. It generates up to eight output frequencies ranging from 8kHz to 1GHz using six integer and two fractional dividers. The device accepts four differential or single-ended input clocks (LVPECL, LVDS, LVCMOS) and supports hitless switching with holdover accuracy of ±50ppb. Jitter performance is less than 0.3ps RMS (including spurs) for two outputs and under 0.5ps RMS for all outputs within the 12kHz to 20MHz bandwidth.

Feature Summary

• Dual independent PLLs supporting jitter attenuation and frequency translation
• Generates up to eight outputs: LVPECL, LVDS, or LVCMOS at frequencies up to 1GHz
• Hitless reference switching with programmable phase-slope limiting
• Holdover mode with initial accuracy of ±50ppb

Applications

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

Procurement Notes

Verify the specific ordering suffix '998' against the official Renesas datasheet to confirm factory pre-programmed configuration parameters. Confirm package availability in the 72QFN format and check moisture sensitivity level requirements during storage and handling.

Selection Notes

Select this component when dual independent clock domains are required for separate transmit and receive paths. Ensure the application utilizes differential inputs compatible with LVPECL, LVDS, or LVCMOS levels. Verify that the required output frequencies fall within the 8kHz to 1GHz range supported by the integer and fractional dividers.

Part Context

This part belongs to the FemtoClock NG family of universal frequency translators. It is designed for high-performance timing applications requiring low phase jitter and flexible frequency conversion capabilities across various network standards.

Replacement Considerations

Consult the official Renesas replacement guide for cross-reference options. Verify compatibility regarding pinout, supply voltage, and programming interface before substituting.