8T49N205A-011NLGI

Overview

The 8T49N205A-011NLGI 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, supporting up to four independent output frequencies ranging from 8 kHz to 1 GHz. The device accepts multiple input clock formats and provides flexible output configurations including LVPECL, LVDS, HCSL, and LVCMOS. Designed for high-performance networking and telecom applications, it ensures compliance with stringent jitter requirements for 10G to 25G Ethernet standards while offering hitless switching capabilities.

Feature Summary

• Single fractional-feedback PLL for jitter attenuation and frequency translation
• Up to four independent outputs (LVPECL, LVDS, HCSL, LVCMOS) up to 1 GHz
• Supports hitless switching and phase-slope limiting
• I2C programmable via internal registers or external EEPROM

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 specific suffix '011' against official Renesas documentation to confirm factory pre-programmed configuration settings. As this component belongs to the 8T49N205 family, ensure compatibility with existing I2C register maps and power supply requirements (2.5V/3.3V). Check for any Product Change Notices (PCN) regarding package or material changes before finalizing procurement plans.

Selection Notes

Select this model when requiring a universal frequency translator with low RMS phase jitter compliant with G.8262 standards. Ensure the design supports the required number of differential or single-ended outputs. Verify that the system can accommodate the necessary crystal oscillator frequency (typically 10MHz to 50MHz) and that I2C bus constraints are met for programming the device's operational parameters.

Part Context

This part is part of the FemtoClock NG series, designed to replace older clock generators in high-speed digital systems. It integrates advanced PLL technology to minimize jitter and spurs, making it suitable for next-generation serial link applications. The 'NLGI' suffix typically denotes a lead-free, RoHS-compliant QFN package variant offered by Renesas.

Replacement Considerations

Direct pin-to-pin replacements within the same family include other 8T49N205 variants with different suffixes (e.g., -008, -012) which may have different factory presets but identical electrical characteristics. Cross-family upgrades such as the 8T49N241 or 8T49N242 offer additional outputs or features but require schematic and software revalidation.