NB2308AI2D

Overview

The NB2308AI2D is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for high-speed clock distribution 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 path selection, 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 within the same bank.

Feature Summary

• Zero delay buffer with adjustable input-to-output propagation delay via capacitive load on the FBK pin.
• Internal PLL supporting input frequencies from 15 MHz to 133 MHz.
• Eight outputs divided into two three-stateable banks controlled by S1 and S2 select inputs.
• Guaranteed output-to-output skew of less than 200 ps and device-to-device skew of less than 700 ps.

Applications

• High-speed clock distribution systems requiring low skew.
• Multi-board synchronization where device-to-device skew must be minimized.
• Systems utilizing multiple clock frequencies derived from a single reference source.

Procurement Notes

Verify the specific suffix 'I' indicates the Industrial temperature range (-40°C to +85°C) and 'D' denotes the SOIC-16 package. Confirm RoHS compliance status if lead-free packaging is required, as indicated by the 'G' suffix in related part numbers. Check current availability as this component may be subject to end-of-life notices or obsolescence.

Selection Notes

Select the NB2308AI2D when industrial temperature operation is required alongside the specific 2x/1x frequency configuration enabled by connecting the feedback pin to Bank A. Ensure the load capacitance requirements are met (15 pF for frequencies above 100 MHz). Compare against NB2308AC1D for commercial temperature alternatives or NB2308AI4D for different frequency multiplication options.

Part Context

The NB2308A series comprises various zero delay buffers with different frequency multiplication capabilities. The NB2308AI2D specifically corresponds to the configuration where Bank A drives the feedback pin, providing 2x frequency on Bank A and reference frequency on Bank B. Other variants like NB2308AI1D provide reference frequencies on both banks, while NB2308AI4D provides 2x on all outputs.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate other members of the NB2308A family, such as NB2308AI1D or NB2308AI4D, if the specific 2x/1x banking configuration is not strictly required.