NB2309AI1HD

Overview

The NB2309AI1HD is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for distributing high-speed clocks in industrial applications. It accepts one reference input and drives nine low-skew outputs arranged in two banks of four plus one feedback output. The device operates within a frequency range of 15 MHz to 133 MHz and utilizes an on-chip PLL that locks to the input clock via the CLKOUT pad. Key performance metrics include less than 250 ps output-to-output skew, less than 700 ps device-to-device skew, and cycle-to-cycle jitter under 200 ps. It is housed in a 16-pin SOIC package.

Feature Summary

• Zero input-output propagation delay with output-to-output skew less than 250 ps
• On-chip PLL provides low phase noise and supports frequencies up to 133 MHz
• Test mode allows bypassing the PLL to apply the input clock directly to outputs
• Bank B outputs can be three-stated independently using Select inputs

Applications

• Distributing high-speed clocks in industrial systems
• PCI bus frequency distribution
• CPU clock distribution compatible with Pentium-based architectures

Procurement Notes

Verify the specific suffix 'HD' indicates the Industrial temperature grade (-40°C to +85°C) and High Drive capability as defined in the ordering information table. Confirm the package type corresponds to the SOIC-16 (Case 751B) dimensions provided in the datasheet. Ensure compatibility with 3.3 V supply requirements and check for Pb-Free status if required by assembly specifications.

Selection Notes

Select this component when a single reference clock must drive multiple loads with minimal skew. The -1H variant offers faster rise and fall times compared to the standard -1 version. Ensure all outputs, including the CLKOUT feedback pin, are uniformly loaded to maintain zero input-output delay characteristics. Verify that the load capacitance does not exceed 10 pF for frequencies above 100 MHz.

Part Context

The NB2309A series includes variants such as NB2309AC1D for commercial temperatures and NB2309AI1D for industrial temperatures. The 'H' designation denotes the high-drive version with improved switching speeds. The NB2305A is an 8-pin counterpart providing five outputs, while the NB2309A provides nine outputs in a 16-pin package.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.