NB4L339MNR4G

Clock Buffers, Drivers Overview

The NB4L339MNR4G is a multi-function clock generator and fan-out buffer manufactured by onsemi. It features a 2:1 differential clock multiplexer front end with four divider blocks providing ÷1, ÷2, ÷4, and ÷8 ratios. The device outputs eight differential LVPECL signals with low skew. It supports input frequencies up to 700 MHz and accepts LVPECL, CML, or LVDS logic levels via internal 50-ohm termination resistors. Operating voltage ranges from 2.375 V to 3.6 V with VEE at 0 V. The component is housed in a 32-pin QFN package (5x5 mm) and is lead-free.

Clock Buffers, Drivers Feature Summary

• Maximum Input/Output Clock Frequency > 700 MHz
• Low Skew LVPECL Outputs with 15 ps typical skew
• Internal 50-ohm Input Termination for LVPECL, CML, or LVDS
• Synchronous Output Enable/Disable to prevent runt pulses

Clock Buffers, Drivers Applications

• Clock distribution networks requiring multiple divide ratios
• High-speed data communication systems
• Test and measurement equipment

Clock Buffers, Drivers Procurement Notes

Verify the ordering suffix 'R4G' corresponds to the tape and reel packaging configuration containing 1000 units per reel. Confirm the device meets Pb-Free requirements as specified in the datasheet. Ensure the procurement documentation references publication number NB4L339/D for accurate technical specifications.

Clock Buffers, Drivers Selection Notes

Select this component when a single IC is required to perform clock multiplexing, frequency division, and buffering simultaneously. The internal termination resistors simplify PCB layout by eliminating external components for input matching. Verify that the system power supply allows for the 2.375 V to 3.6 V operating range and that the thermal design accommodates the junction-to-ambient resistance of the QFN32 package.

Clock Buffers, Drivers Part Context

This part belongs to the NB4L339 family of clock drivers. The MNR4G suffix specifically denotes the tape and reel packaging variant, whereas the MNG suffix indicates tray packaging. Both variants share identical electrical characteristics and functionality within the 32-pin QFN form factor.

Clock Buffers, Drivers Replacement Considerations

The datasheet notes functional compatibility with existing 2.5 V / 3.3 V LVEL, LVEP, EP, and SG devices. Verify pinout and electrical parameters against specific legacy part numbers before substitution.