8T49N240-994NLGI

Overview

The 8T49N240-994NLGI is a FemtoClock NG ultra-performance jitter attenuator manufactured by Renesas Electronics. It operates within a supply voltage range of 2.375 V to 3.465 V and supports an input frequency up to 875 MHz with a maximum output frequency of 867 MHz. The device features four outputs in a 40-VFQFN package, designed for low phase noise applications. It functions as a clock synthesizer or jitter cleaner, accepting various differential input levels including LVPECL, LVDS, and HCSL.

Feature Summary

• Ultra-performance jitter attenuation with FemtoClock NG technology
• Four independent outputs supporting LVPECL, LVDS, HCSL, or LVCMOS levels
• Input frequency range up to 875 MHz; Output frequency up to 867 MHz
• I2C programmable register interface for configuration

Applications

• SONET/SDH network line cards
• Ethernet synchronization equipment (SyncE)
• Wireless base station baseband units
• Test and measurement instrumentation

Procurement Notes

Verify the specific suffix '994' against official Renesas documentation to confirm boot mode and EEPROM requirements. Confirm availability status as lead times may vary. Ensure the ordering code matches the required factory pre-programmed configuration settings before procurement.

Selection Notes

Select this component when low RMS phase jitter is critical for high-speed serial links. Compare against the 8T49N241 if fractional output dividers are required instead of integer dividers. Verify that the 40-VFQFN package size fits the PCB layout constraints and thermal requirements for the target application environment.

Part Context

This part belongs to the FemtoClock NG family of universal frequency translators. It shares architectural similarities with the 8T49N241 and 8T49N242 but differs in PLL configuration and divider capabilities. The 8T49N240 series is optimized for jitter attenuation rather than wide-range frequency synthesis found in other family members.

Replacement Considerations

The 8T49N241-998NLGI8 serves as a functional alternative if fractional-N synthesis is needed. The 8T49N242-998NLGI offers similar performance with different internal divider structures. Verify pin compatibility and software configuration differences before substitution.