NB2308AI3D

Overview

The NB2308AI3D is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for distributing high-speed clocks in industrial environments. It features an internal PLL that locks to a reference clock input and provides eight buffered outputs organized into two banks of four. The device supports multiple frequency configurations based on the feedback source, including reference, 2x, and 4x frequencies. Key electrical specifications include a maximum operating frequency of 133.3 MHz, a supply voltage range of 3.0 V to 3.6 V, and an output-to-output skew of less than 200 ps. It operates within a temperature range of -40°C to +85°C and is housed in a 16-pin SOIC package.

Feature Summary

• Zero delay buffer with adjustable input-to-output propagation delay via capacitive load on the FBK pin.
• Multiple configuration options allowing reference, 2x, or 4x output frequencies depending on feedback selection.
• Low-skew performance with output-to-output skew less than 200 ps and device-to-device skew less than 700 ps.
• Two banks of four outputs each, controllable via select inputs for three-stating or direct reference application.

Applications

• High-speed clock distribution networks requiring low skew.
• Systems utilizing multiple NB2308A devices for synchronized clock generation.
• Industrial equipment requiring robust clock buffering across wide temperature ranges.

Procurement Notes

Verify the specific suffix 'I' indicates the industrial temperature grade (-40°C to +85°C) and 'D' denotes the SOIC-16 package. Confirm RoHS compliance status if lead-free packaging is required, as non-G suffixes may not be Pb-Free. Check current availability as this component series has been subject to discontinuation notices from the manufacturer.

Selection Notes

Select the NB2308AI3D when industrial temperature operation is required alongside the specific frequency multiplication capabilities of the NB2308Ax3 configuration. Ensure the PCB layout accounts for the 15 pF load capacitance requirement for frequencies above 100 MHz to maintain specified rise/fall times and jitter performance. Verify that the feedback path connects to Bank A or Bank B outputs to achieve the desired 2x/4x frequency scaling.

Part Context

The NB2308AI3D belongs to the NB2308A family of 3.3 V zero delay buffers. The 'I' suffix distinguishes it from commercial variants (C suffix) by its extended temperature range. It shares the same functional block diagram and electrical characteristics as other NB2308A models, differing primarily in temperature rating and specific output frequency scaling determined by the middle digit (3 for NB2308Ax3).

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consider checking for updated revisions or alternative packages (e.g., TSSOP-16) within the same NB2308A family if pin compatibility is maintained.