8T49N241-998NLGI

Overview

The 8T49N241-998NLGI is a FemtoClock NG Universal Frequency Translator featuring one fractional-feedback PLL, one integer divider, and three fractional output dividers. It generates up to four independent output clocks ranging from 8kHz to 1.0GHz (LVPECL/LVDS/HCSL) or 250MHz (LVCMOS). The device supports jitter attenuation with 0.35ps RMS jitter (12kHz–20MHz) and accepts multiple input formats including LVPECL, LVDS, LVHSTL, HCSL, LVCMOS, and crystals. Configuration is register-programmable via I²C or external EEPROM, with the '998' suffix indicating boot-from-EEPROM capability.

Feature Summary

• Generates up to four independent output frequencies from 8kHz to 1.0GHz using one integer and three fractional dividers.
• Supports jitter attenuation compliant with Telcordia GR-253-CORE and ITU-T G.813/G.8262 standards.
• Features auto/manual input clock selection with hitless switching and phase-slope limiting.
• Configurable via I²C or external EEPROM; specific suffix indicates boot-from-EEPROM initialization.

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 applications

Procurement Notes

Verify the exact ordering suffix against current Renesas documentation, as product portfolios may undergo transitions. Confirm package availability and lead times directly with authorized distributors or the manufacturer, as stock levels fluctuate. Ensure the selected variant matches the required boot configuration (e.g., EEPROM vs. OTP) for the target design.

Selection Notes

Select this component when designing systems requiring up to four distinct output frequencies derived from a single input or crystal source. The device is suitable for applications demanding low jitter performance (<0.35ps RMS) and flexible input/output voltage levels. Verify that the required output swing (LVPECL, LVDS, HCSL, or LVCMOS) aligns with the downstream receiver specifications.

Part Context

This part belongs to the FemtoClock NG family of universal frequency translators. It serves as a successor to legacy synthesizers like the 84330C series, offering enhanced programmability and lower jitter through fractional-N synthesis technology. The device integrates an internal EEPROM option and supports software configuration via Timing Commander™ tools.

Replacement Considerations

The 8T49N242-998NLGI is a similar device within the same family but offers different pinout or feature variations. Legacy parts such as the 84330CVLN are discontinued and listed as obsolete alternatives. Verify functional compatibility and pin assignments before substituting with other models in the 8T49N24x series.