8T49N240-991NLGI8

Overview

The 8T49N240-991NLGI8 is a FemtoClock NG Universal Frequency Translator manufactured by Renesas Electronics. It features a single fractional-feedback PLL capable of jitter attenuation or frequency synthesis, equipped with four integer output dividers to generate up to four independent frequencies ranging from 8 kHz to 867 MHz. The device accepts differential inputs including LVPECL, LVDS, and HCSL, and supports crystal inputs between 19.6 MHz and 27.2 MHz. It operates on a 3.3 V supply within a -40°C to +85°C temperature range.

Feature Summary

• Generates multiple independent output frequencies from flexible input sources using a single fractional-feedback PLL.
• Provides configurable differential outputs in LVPECL, LVDS, or HCSL formats for diverse system compatibility.
• Supports boot configuration from external I2C EEPROM or internal OTP memory for reliable power-up states.
• Includes clock input monitoring and hitless switching capabilities to maintain signal integrity during transitions.

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 '991' against official Renesas documentation to confirm exact factory pre-programmed configurations. Confirm package type and RoHS compliance status prior to integration. Ensure design-in tools like Timing Commander are available for final validation.

Selection Notes

Select this component when low phase jitter performance below 200 fs is required for high-speed interfaces. Consider its small 6 mm x 6 mm footprint for space-constrained layouts. Evaluate its flexibility for replacing multiple fixed-frequency generators with a single programmable solution.

Part Context

This part belongs to the FemtoClock NG family, designed for high-performance clock generation. It addresses the need for precise timing in multi-gigabit serial links. The series emphasizes low noise and high configurability for modern communication infrastructure.

Replacement Considerations

Consult official substitution lists for compatible devices such as the 8T49N241 or 8T49N242 series. Verify pinout and register compatibility before swapping components in existing designs.