8T49N241-003NLGI8

Overview

The Renesas 8T49N241-003NLGI8 is a FemtoClock NG Universal Frequency Translator featuring one fractional-feedback PLL and four output dividers (one integer, three fractional). It generates up to four independent differential LVPECL/LVDS/HCSL outputs up to 1.0 GHz or sixteen LVCMOS outputs up to 250 MHz. The device accepts two inputs from 8 kHz to 875 MHz, supports hitless switching, and includes phase-slope limiting for transient control. Configuration is handled via I²C or external EEPROM.

Feature Summary

• Generates up to four independent output frequencies ranging from 8 kHz to 1.0 GHz with jitter attenuation capabilities.
• Supports low jitter performance of 0.35 ps RMS (including spurs) in the 12 kHz to 20 MHz bandwidth.
• Features auto and manual input clock selection with hitless switching and phase-slope limiting options.
• Configurable via I²C interface or boot directly from an 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
• GbE/10GbE/100GbE Synchronous Ethernet applications

Procurement Notes

Verify component status as the 8T49N241 series may have discontinuation notices. Confirm package type and ordering suffixes against official datasheets. Check RoHS3 compliance and MSL ratings before integration. Ensure supply chain stability due to potential lifecycle changes.

Selection Notes

Select this model for designs requiring multiple independent clock frequencies derived from a single source. Verify that input frequencies fall within the 8 kHz to 875 MHz range. Ensure output voltage levels (LVPECL, LVDS, HCSL, LVCMOS) match downstream receiver requirements. Consider external EEPROM if persistent configuration without host intervention is needed.

Part Context

This part belongs to the FemtoClock NG family of universal frequency translators. It shares architectural similarities with the 8T49N240 and 8T49N242 models but offers specific divider configurations. The device is designed for high-performance timing applications requiring precise frequency translation and jitter cleaning.

Replacement Considerations

Publicly listed similar substitutes include the 8T49N241-994NLGI, 8T49N241-998NLGI, and 8T49N241-999NLGI. These variants differ primarily in boot modes or packaging. Verify pin compatibility and electrical specifications before substitution.