8T49N240-029NLGI

Overview

The Renesas 8T49N240-029NLGI is a FemtoClock NG Universal Frequency Translator featuring a single fractional-feedback PLL. It generates up to four independent output frequencies ranging from 8 kHz to 867 MHz using integer and fractional dividers. The device supports LVDS, LVPECL, or HCSL differential outputs with RMS phase jitter below 200 fs (12 kHz to 20 MHz). It accepts dual clock inputs and an internal crystal oscillator, configurable via I²C or OTP memory for jitter attenuation or synthesis modes.

Feature Summary

• Generates up to four independent output frequencies from 8 kHz to 867 MHz
• RMS phase jitter specification below 200 fs (12 kHz to 20 MHz)
• Configurable LVDS, LVPECL, or HCSL differential output levels
• Supports Jitter Attenuator and Frequency Synthesizer operating modes

Applications

• 10 Gbps, 40 Gbps, and 100 Gbps router timing
• Wireless access network backhaul systems
• OTU2 and OTU3 OTN multiplexers
• Xilinx Virtex UltraScale FPGA clocking

Procurement Notes

Verify the specific suffix '029' against official Renesas documentation to confirm factory pre-programmed frequency configurations. Confirm current manufacturing status as some 8T49N240 variants are discontinued. Ensure compatibility with required output voltage levels and package specifications before procurement.

Selection Notes

Select this component when low phase jitter below 200 fs is required for high-speed serial interfaces. Verify that the maximum output frequency of 867 MHz meets system requirements. Confirm support for desired output formats such as LVDS or LVPECL. Check if the integrated PLL flexibility reduces the need for external fanout buffers.

Part Context

This part belongs to the Renesas FemtoClock NG family of universal frequency translators. These devices integrate advanced PLL technology to provide flexible clock generation and jitter cleaning. The 8T49N240 series is designed for high-performance networking and telecommunications applications requiring precise timing synchronization.

Replacement Considerations

The 8T49N241 and 8T49N242 are similar devices within the same product family. Verify pin-to-pin compatibility and register configuration differences. Note that Renesas timing products have been acquired by SiTime; consult updated documentation for long-term supply availability.