8T49N240-020NLGI

Overview

The 8T49N240-020NLGI is a FemtoClock NG ultra-performance jitter attenuator manufactured by Renesas Electronics. It features a single fractional-feedback PLL capable of generating up to four independent output frequencies ranging from 8 kHz to 1 GHz (differential) or 250 MHz (LVCMOS). The device accepts multiple input clock formats including LVPECL, LVDS, HCSL, and LVCMOS, with an input frequency range up to 875 MHz. Key electrical specifications include a typical RMS phase jitter of 0.276 ps (including spurs) within the 12 kHz to 20 MHz bandwidth. It operates on a single 3.3 V supply voltage and supports I2C programming for register configuration.

Feature Summary

• Ultra-low jitter performance: 0.276 ps RMS (including spurs) in 12kHz–20MHz bandwidth
• Single fractional-feedback PLL supporting up to four independent output frequencies
• Flexible input support: LVPECL, LVDS, LVHSTL, HCSL, or LVCMOS (up to 875 MHz)
• Configurable outputs: LVPECL, LVDS, HCSL, or LVCMOS (up to 1 GHz differential)

Applications

• SONET/SDH and SyncE network line cards
• 10G/40G/100G Ethernet applications
• Wireless base station baseband units
• Carrier Ethernet switches

Procurement Notes

Verify the specific suffix '020NLGI' against official Renesas documentation to confirm factory pre-programmed frequency configurations. Ensure compatibility with the required output voltage levels and input reference sources before integration. Confirm RoHS compliance status and moisture sensitivity level (MSL) ratings for surface-mount assembly processes.

Selection Notes

Select this component when low phase jitter is critical for high-speed serial links. Compare against the 8T49N241 and 8T49N242 models if additional PLLs or different boot options are required. Verify that the 875 MHz maximum input frequency meets the system's reference clock requirements.

Part Context

This part belongs to the FemtoClock NG Universal Frequency Translator family. It shares architectural similarities with the 8T49N241 and 8T49N242 but differs in specific factory programming and pinout configurations. The device utilizes advanced analog/digital PLL techniques to achieve superior jitter attenuation compared to standard synthesizers.

Replacement Considerations

Direct replacements may include the 8T49N241 or 8T49N242 series, provided the specific frequency configurations match the application requirements. Verify package compatibility (VFQFN-40) and electrical parameters such as supply voltage and operating temperature range (-40°C to +85°C).