8T49N241NLGI

Overview

The Renesas 8T49N241NLGI is a FemtoClock NG Universal Frequency Translator featuring one fractional-feedback PLL and three fractional output dividers. It generates up to four independent differential outputs (LVPECL, LVDS, HCSL) or sixteen single-ended LVCMOS outputs ranging from 8 kHz to 1 GHz. The device accepts two input clocks (8 kHz to 875 MHz) and supports hitless switching with phase-slope limiting. Key electrical parameters include an RMS jitter of 0.35 ps (including spurs) from 12 kHz to 20 MHz, operating voltage of 2.5 V or 3.3 V, and a 40-pin QFN package.

Feature Summary

• Generates up to 4 independent differential or 16 single-ended LVCMOS outputs
• Ultra-low 0.35 ps RMS jitter (12 kHz to 20 MHz)
• Supports hitless switching and phase-slope limiting for transient control
• Register programmable via I²C or external EEPROM

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 applications

Procurement Notes

Verify the specific suffix against official documentation, as standard variants like 8T49N241-998NLGI typically indicate boot-from-EEPROM configurations. Confirm current availability status, as this component may be subject to discontinuation notices or supply chain transitions associated with the broader FemtoClock product family.

Selection Notes

Select this model when requiring ultra-low jitter performance below 0.35 ps RMS for high-speed serial links. Ensure the design accommodates the 40-VFQFN exposed pad thermal requirements. Verify that the required output frequencies fall within the 8 kHz to 1 GHz range supported by the fractional dividers.

Part Context

This part belongs to the FemtoClock NG Universal Frequency Translator series, designed for networking and communication infrastructure. It integrates jitter attenuation and frequency synthesis capabilities into a single chip, replacing multiple discrete clock generation components in complex system architectures.

Replacement Considerations

The 8T49N242NLGI serves as a similar alternative within the same family. Both devices share the 40-VFQFN package and core functionality, though specific pinout or feature differences should be verified in the respective datasheets before substitution.