8T49N242-998NLGI

Overview

The Renesas 8T49N242-998NLGI is a FemtoClock NG Universal Frequency Translator featuring one fractional-feedback PLL and four integer output dividers. It generates up to four independent output frequencies ranging from 8kHz to 1.0GHz (differential) or 250MHz (LVCMOS). The device accepts two differential/single-ended input clocks (8kHz–875MHz) or a 10MHz–50MHz crystal. Key electrical parameters include a typical jitter of 0.35ps RMS (12kHz–20MHz), an initial holdover accuracy of ±50ppb, and programmable loop bandwidths from 0.2Hz to 6.4kHz. It supports LVPECL, LVDS, HCSL, and LVCMOS outputs with 2.5V/3.3V supply modes.

Feature Summary

• Supports SDH/SONET and Synchronous Ethernet clock conversions including all FEC rates
• Generates four independent output clocks with frequencies up to 1.0GHz
• Features auto/manual hitless switching between two input references
• Programmable via I2C interface or external EEPROM

Applications

• OTN or SONET/SDH equipment
• Gigabit and Terabit IP switches/routers including Synchronous Ethernet
• Video broadcast systems

Procurement Notes

Verify the specific ordering suffix '998' confirms the factory pre-programmed configuration for booting from an external I2C EEPROM. Confirm package type is 40-VFQFPN and check RoHS compliance status against current manufacturing notices.

Selection Notes

Select this component when requiring a universal frequency translator with low jitter performance for synchronous Ethernet applications. Ensure the design accommodates the 40-pin VFQFPN package and provides appropriate power supplies for VCCA, VCC, and VCCO pins.

Part Context

This part belongs to the FemtoClock NG family of clock generators and synthesizers. It is designed for high-performance timing applications requiring precise frequency translation and jitter attenuation across various network standards.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.