8T49N1012-004NLGI

Overview

The 8T49N1012-004NLGI is a FemtoClock NG Universal Frequency Translator manufactured by Renesas Electronics. It features one fractional-feedback PLL and four integer output dividers, enabling the generation of up to four independent output frequencies ranging from 8kHz to 1.0GHz (differential) or 250MHz (LVCMOS). The device accepts multiple input clock formats including LVPECL, LVDS, HCSL, and LVCMOS. It supports I2C programming and includes phase-slope limiting for hitless switching. Designed for high-performance networking, it meets jitter limits for 10G to 25G Ethernet applications with an RMS jitter of 0.276ps.

Feature Summary

• Generates up to 4 LVPECL/LVDS/HCSL or 16 LVCMOS outputs from 8kHz to 1.0GHz
• Supports hitless switching with phase-slope limiting and clock input monitoring
• I2C programmable via internal registers or external EEPROM
• Compliant with Telcordia GR-253-CORE and ITU-T G.813/G.8262 standards

Applications

• 10G/40G/100G SONET/SDH and Ethernet network line cards
• Wireless base station baseband units
• Carrier Ethernet switches and OTN equipment
• GbE/10GbE/100GbE Synchronous Ethernet line card applications

Part Context

This component belongs to the FemtoClock NG family of universal frequency translators. It is designed to replace traditional fixed-frequency oscillators and fanout buffers in complex timing architectures. The part allows for significant board space reduction by integrating multiple clock functions into a single programmable IC.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with existing I2C configurations and power supply requirements when considering alternative devices.