8T49N286-998NLGI

Overview

The 8T49N286-998NLGI is a FemtoClock NG Universal Frequency Translator (UFT) clock synthesizer manufactured by Renesas Electronics. It integrates a fractional-feedback PLL for jitter attenuation and frequency synthesis, supporting up to four independent output frequencies ranging from 8kHz to 1GHz. The device accepts multiple input formats including LVPECL, LVDS, and crystal oscillators. Key electrical specifications include an RMS phase jitter of 0.35ps (including spurs) within the 12kHz to 20MHz bandwidth. It operates on a single 2.5V or 3.3V supply and features I²C programmability with optional boot-from-EEPROM configuration via the '998' suffix.

Feature Summary

• FemtoClock NG UFT architecture with 0.35ps RMS jitter performance
• Supports up to four independent output frequencies from 8kHz to 1GHz
• Flexible input options: LVPECL, LVDS, LVHSTL, HCSL, or Crystal
• Hitless switching between input clocks with phase-slope limiting

Applications

• 10G/40G/100G SONET/SDH network line cards
• Carrier Ethernet switches and OTN equipment
• Wireless base station baseband units
• Test and measurement instrumentation

Procurement Notes

Verify the exact suffix against the datasheet, as '998' typically denotes specific boot configurations such as loading settings from an external EEPROM. Confirm availability status directly with authorized distributors, as lead times may vary significantly due to manufacturing cycles. Ensure the package type matches the design requirements before ordering.

Selection Notes

Select this component when low jitter (<0.35ps) and high flexibility in generating multiple unrelated output frequencies are required. Compare with the 8T49N241 if fractional dividers are not needed, or the 8T49N242 for different pinout compatibility. Verify that the required output voltage levels (LVPECL, LVDS, HCSL) align with the target system interfaces.

Part Context

This part belongs to the FemtoClock NG family of universal frequency translators designed for high-performance networking and communications. It serves as a timing solution for applications requiring precise synchronization and jitter cleaning across various serial standards like Ethernet and SONET/SDH.

Replacement Considerations

The 8T49N241-998NLGI is a similar alternative within the same family. Check register compatibility and pinout differences before substitution. Other family members like the 8T49N242 offer comparable functionality with potential packaging variations.