8T49N242-999NLGI#

Overview

The 8T49N242-999NLGI is a FemtoClock NG Universal Frequency Translator (UFT) manufactured by Renesas Electronics. It integrates one fractional-feedback PLL and four integer output dividers to generate up to four independent output clocks ranging from 8kHz to 1.0GHz (differential) or 250MHz (LVCMOS). The device supports LVPECL, LVDS, HCSL, and LVCMOS output levels with an RMS jitter of 0.276ps (including spurs) from 12kHz to 20MHz. It accepts up to two input clocks via LVPECL, LVDS, LVHSTL, HCSL, or LVCMOS interfaces. The suffix '999' indicates the device powers up in a disabled state upon initialization.

Feature Summary

• Generates up to 4 independent output frequencies from 8kHz to 1.0GHz using a single fractional-feedback PLL and four integer dividers.
• Supports multiple output voltage standards including LVPECL, LVDS, HCSL, and LVCMOS.
• Features auto and manual input clock selection with hitless switching capabilities.
• Includes phase-slope limiting and fully hitless switching options to control output phase transients.

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

Procurement Notes

Verify that the specific ordering suffix '-999' is required for the design, as this variant powers up disabled. Confirm compatibility with the I2C EEPROM configuration method if booting from external memory is intended. Check current supply chain status as product availability may vary due to ongoing transitions within the timing product portfolio.

Selection Notes

Select the 8T49N242-999NLGI when a power-up disabled state is necessary for system sequencing. Ensure the application requires up to four differential outputs or sixteen LVCMOS outputs. Verify that the input clock sources match the supported LVPECL, LVDS, LVHSTL, HCSL, or LVCMOS types. Use Timing Commander software for register programming and configuration validation.

Part Context

This component belongs to the FemtoClock NG family of universal frequency translators. It is designed to replace traditional crystal oscillators and VCXOs in high-performance networking and telecommunications systems. The device offers flexibility through programmable output frequencies and jitter attenuation capabilities, supporting compliance with Telcordia GR-253-CORE and ITU-T G.813/G.8262 standards when paired with appropriate timing sources.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official replacement guides or contact technical support for cross-references, noting potential portfolio transitions affecting long-term availability.