8T49N285-002NLGI

Overview

The 8T49N285-002NLGI is a FemtoClock NG Universal Frequency Translator manufactured by Renesas Electronics. It functions as a clock synthesizer and jitter cleaner designed for high-performance timing applications. The device utilizes fourth-generation FemtoClock NG PLL technology to generate low phase jitter clocks from crystal or external reference inputs. It supports multiple output configurations compliant with standards such as PCI Express Gen2/Gen3 and SONET/SDH, making it suitable for network line cards and baseband units requiring precise synchronization.

Feature Summary

• Fourth-generation FemtoClock NG PLL technology for low RMS phase jitter generation
• Supports up to four different output frequencies ranging from 8kHz to 1GHz
• Configurable outputs including LVPECL, LVDS, HCSL, and LVCMOS levels
• Register programmable via I2C interface or external I2C EEPROM

Applications

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

Procurement Notes

Verify the exact suffix against the official datasheet, as '002' may indicate a specific factory pre-programmed frequency configuration. Confirm current lifecycle status, as similar models in this series are marked as obsolete or EOL in public records. Ensure compatibility with required output voltage levels (2.5V or 3.3V) during design-in.

Selection Notes

Select this component when low jitter performance is critical for serial data links like PCIe or Ethernet. Compare RMS phase jitter specifications at relevant offset frequencies against alternative synthesizers. Verify that the available output drive strengths and voltage levels match the downstream receiver requirements without additional buffering.

Part Context

This part belongs to the 8T49N28x family of Universal Frequency Translators. It shares architectural similarities with the 8T49N287 and 8T49N242 but differs in specific output channel counts and pre-programmed configuration options. The FemtoClock NG branding indicates advanced jitter attenuation capabilities compared to earlier generations.

Replacement Considerations

Public documentation lists the 8T49N287A-998NLGI as a related model within the same FemtoClock NG UFT GR.1244 Stratum category. Direct substitution requires verification of register compatibility and output frequency configurations.