8T49N240-024NLGI

Overview

The 8T49N240-024NLGI is a FemtoClock NG Universal Frequency Translator manufactured by Renesas Electronics. It integrates a single fractional-feedback PLL to generate up to four independent output frequencies ranging from 8 kHz to 867 MHz. The device supports LVDS, LVPECL, and HCSL differential outputs, with options for 2x LVCMOS via OTP memory. It features dual clock inputs with hitless switching, phase-slope limiting, and an I²C interface for register programming. Designed for low jitter applications, it provides less than 200 fs RMS phase jitter (12 kHz to 20 MHz), suitable for high-speed serial interfaces.

Feature Summary

• Generates up to four independent output frequencies from 8 kHz to 867 MHz using a single fractional-feedback PLL.
• Supports configurable LVDS, LVPECL, and HCSL output levels with dual input capability and hitless switching.
• Delivers ultra-low RMS phase jitter of less than 200 fs (12 kHz to 20 MHz) for high-speed data integrity.
• Includes phase-slope limiting and fully hitless switching options to control output phase transients during source changes.

Applications

• 10 Gbps, 40 Gbps, and 100 Gbps router timing solutions
• Wireless access network backhaul systems
• Redundant 40 Gbps and 100 Gbps data center switches
• OTU2 and OTU3 OTN multiplexers

Procurement Notes

Verify the specific suffix '024' against official Renesas documentation to confirm factory-programmed frequency configurations and boot settings. Confirm RoHS compliance status and moisture sensitivity level prior to ordering. Check current availability as production cycles may vary. Ensure the required output voltage levels match the target system design constraints.

Selection Notes

Select this component when designing systems requiring flexible frequency translation from diverse input references to precise high-speed outputs. It is appropriate for applications needing jitter attenuation or synthesis with minimal PCB footprint. Consider the 6 mm x 6 mm VFQFN package for space-constrained layouts. Verify that the required output drive strength and voltage standards align with the connected PHY or FPGA specifications.

Part Context

This part belongs to the Renesas FemtoClock NG family of universal frequency translators. These devices are engineered to provide significant design margin for 10 Gbps and multi-channel 40/100 Gbps interfaces. The family utilizes advanced PLL technology to achieve low phase noise, enabling simplified clock tree designs and reduced overall system costs compared to traditional discrete solutions.

Replacement Considerations

Consult official Renesas cross-reference guides for verified substitutes. Generic clock generators may not support the specific fractional-N architecture or hitless switching features required for seamless replacement in redundant network architectures.