8T49N240-036NLGI8

Overview

The 8T49N240-036NLGI8 is a FemtoClock NG Universal Frequency Translator manufactured by Renesas Electronics. It functions as a highly programmable clock generator and jitter attenuator designed for high-speed serial interfaces. The device supports dual differential inputs with signal loss monitoring and flexible switching options, generating up to four differential outputs configurable as LVDS, LVPECL, or HCSL. It features three integer and one fractional output divider, allowing generation of any set of output frequencies from crystal or reference inputs. The component operates within a -40°C to +85°C ambient temperature range and utilizes an I2C programming interface for configuration.

Feature Summary

• Supports both clock synthesizer/generator and jitter attenuator modes via register control
• Generates multiple output frequencies from dual inputs using three integer and one fractional divider
• Configurable differential outputs supporting LVDS, LVPECL, and HCSL logic families
• Includes internal OTP memory for boot configuration without software intervention

Applications

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

Procurement Notes

Verify the specific suffix '036' against official Renesas documentation to confirm exact factory pre-programmed frequency configurations. Confirm current product status as availability may vary due to lifecycle changes. Ensure compatibility with required supply voltages and I2C addressing before integration into the design.

Selection Notes

Select this component when low phase jitter performance below 200 fs is required for 10 Gbps PHYs and switches. Choose this part for designs needing flexibility in input/output frequency ratios and small PCB footprint. Consider the integrated jitter attenuation capabilities to simplify clock tree design and reduce overall system costs compared to discrete solutions.

Part Context

This device belongs to the FemtoClock NG family of universal frequency translators. It is engineered to provide significant design margin for high-speed serial applications by minimizing phase noise. The series allows engineers to reuse a single component across multiple designs, reducing SKU management complexity and accelerating time-to-market for networking and storage equipment.

Replacement Considerations

Consult official substitution lists for compatible alternatives such as the 8T49N241 or 8T49N242 series. Verify pinout and electrical parameter compatibility before replacing. Note that the Renesas timing portfolio transition involves SiTime; check for updated support channels and equivalent offerings if sourcing new production units.