8T49N240-998NLGI

Overview

The 8T49N240-998NLGI is a FemtoClock NG ultra-performance jitter attenuator manufactured by Renesas Electronics. It features one fractional-feedback PLL and four integer output dividers, supporting up to four independent differential or single-ended outputs. The device accepts input frequencies from 8 kHz to 875 MHz and generates output frequencies ranging from 8 kHz to 867 MHz. It operates on a supply voltage between 2.375 V and 3.465 V within an industrial temperature range of -40°C to +85°C. Packaged in a 40-VFQFN exposed pad, it supports I2C programming and booting from external EEPROM.

Feature Summary

• Ultra-low jitter attenuation with 0.276ps RMS (including spurs) from 12kHz to 20MHz
• Four integer output dividers generating up to four independent output clocks
• Supports LVPECL, LVDS, HCSL, and LVCMOS output formats
• Hitless switching with phase-slope limiting for output phase transient control

Applications

• 10G/40G/100G SONET/SDH and Ethernet network line cards
• Wireless base station baseband units
• Carrier Ethernet switches and OTN equipment
• GbE/10GbE/100GbE Synchronous Ethernet line card applications

Procurement Notes

Verify the specific suffix '998' indicates the configuration for booting from an external I2C EEPROM upon power-up. Confirm package details are 40-VFQFN with an exposed pad. Ensure compatibility with the required supply voltage range of 2.375 V to 3.465 V for the target design.

Selection Notes

Select this component when low jitter performance is critical for high-speed serial links. Compare against the 8T49N242 if higher output frequencies up to 1 GHz are required. Verify that the maximum input frequency of 875 MHz meets the source clock requirements of the system.

Part Context

This part belongs to the FemtoClock NG family of universal frequency translators. It is designed to replace crystal oscillators and VCXOs in complex timing architectures. The device integrates programmable logic to simplify board layout and reduce component count in multi-clock systems.

Replacement Considerations

The 8T49N240-990NLGI is a related variant within the same series. Check datasheets for differences in packaging quantities or specific feature enablement before substitution.