NB2308AC3DG

Overview

The NB2308AC3DG is a commercial-grade, 3.3 V zero delay clock buffer manufactured by onsemi in a 16-pin SOIC package. It features an internal PLL that locks to a reference input on the REF pin, with feedback driven from one of the outputs to the FBK pin. This configuration enables adjustable zero input-to-output propagation delay and low skew distribution. The device supports an input frequency range of 15 MHz to 133 MHz and provides eight buffered outputs organized into two banks of four. Each bank can be independently controlled via select inputs for tri-stating or bypass modes.

Feature Summary

• Zero Delay Buffer: Adjustable input-to-output delay using capacitive load differences on the FBK pin.
• Frequency Multiplication: Configured as NB2308Ax3 to provide 4X and 2X output frequencies relative to the reference.
• Low Skew Performance: Guaranteed output-to-output skew less than 200 ps within the same bank.
• Flexible Control: Two select inputs (S1, S2) allow independent control of Bank A and Bank B states.

Applications

• High-speed clock distribution in PC and workstation architectures.
• Datacom and telecom system timing synchronization.
• Multi-device clock skew management requiring less than 700 ps inter-device skew.

Procurement Notes

Verify the specific suffix 'DG' indicates a lead-free (Pb-Free) SOIC-16 package per the ordering information table. Confirm the operating temperature range corresponds to the 'C' suffix for Commercial grade (0°C to 70°C). Ensure the design utilizes the correct feedback path to achieve the intended 4X/2X multiplication ratios defined for the x3 configuration.

Selection Notes

Select this component when a 4X or 2X clock multiplier is required alongside zero-delay buffering. The NB2308AC3DG specifically drives Bank A at 4X and Bank B at 2X (or Reference) depending on the feedback source. For applications requiring only 1X or 2X outputs, consider the NB2308AC1DG or NB2308AC2DG variants respectively. Ensure load capacitance requirements are met (15 pF for >100 MHz operation).