8T49N285-999NLGI

Overview

The 8T49N285-999NLGI is a clock synthesizer and jitter cleaner from Renesas Electronics, part of the FemtoClock NG UFT GR.1244 Stratum series. It functions as a universal frequency translator designed to meet stringent timing requirements for high-speed networking applications. The device supports compliant operation with Telcordia GR-253-CORE (SONET) and ITU-T G.813/G.8262 (SDH/SONET & SyncE) standards when paired with a Synchronous Equipment Timing Source (SETS). It features programmable outputs and advanced phase-slope limiting capabilities to ensure signal integrity in demanding environments.

Feature Summary

• Generates up to 4 LVPECL/LVDS/HCSL or 16 LVCMOS output clocks ranging from 8kHz up to 1.0GHz (differential) or 250MHz (LVCMOS)
• RMS phase jitter performance of 0.276ps (including spurs) within the 12kHz to 20MHz bandwidth
• Supports auto and manual input clock selection with hitless switching and gapped clock monitoring
• Programmable via I²C interface or external I²C EEPROM

Applications

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

Procurement Notes

Verify component status prior to procurement as the related 8T49N203A model indicates End-of-Life (EOL) notifications within the product family. Confirm availability through authorized distributors, noting that factory production times may be extended. Ensure compliance with RoHS3 specifications and check for any Product Change Notices (PCN) regarding assembly site or marking changes before finalizing orders.

Selection Notes

Select this component for designs requiring low-jitter clock generation compliant with GR.1244 Stratum standards. Ensure the design accommodates the required supply voltage and utilizes the I²C interface for configuration. Verify that the target application benefits from the hitless switching feature for input clock redundancy. Consider the package type and thermal requirements associated with high-frequency differential outputs.