NB2308AI4D

Overview

The NB2308AI4D is a 3.3 V zero delay clock buffer from the NB2308A family, manufactured by onsemi. It features an internal PLL that locks to a reference clock input and provides eight buffered outputs divided into two banks of four. The device supports multiple frequency configurations, including 1x, 2x, and 4x multiplication depending on feedback routing. Key electrical specifications include an operating supply voltage range of 3.0 V to 3.6 V, an input frequency range of 15 MHz to 133 MHz, and an output frequency capability up to 133.3 MHz. It operates within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Zero Delay Buffer with adjustable input-to-output propagation delay via capacitive load on the FBK pin.
• Multiple configuration options (NB2308Ax4) allowing for 2X clock generation on all outputs.
• Low-skew performance with output-to-output skew less than 200 ps and device-to-device skew less than 700 ps.
• Two selectable output banks controlled by S1 and S2 select inputs, enabling three-stating of unused banks.

Applications

• High-speed clock distribution in multi-chip systems.
• System testing applications requiring direct input clock application to outputs.
• Clock buffering where low skew and precise timing alignment are critical.

Procurement Notes

Verify the specific ordering suffix to confirm package type and shipping quantity. The 'D' suffix indicates a SOIC-16 package, while 'DT' denotes TSSOP-16. Suffixes such as 'R2' specify tape and reel packaging, whereas their absence typically indicates rail shipping. Confirm RoHS compliance status if lead-free construction is required for the assembly process.

Selection Notes

Select the NB2308AI4D when industrial temperature operation (-40°C to +85°C) is required. Ensure the application utilizes the NB2308Ax4 configuration logic, where feedback is sourced from Bank A or Bank B to generate 2X frequencies on both banks. Verify that the load capacitance requirements align with the specified limits for the target operating frequency to maintain jitter and skew specifications.

Part Context

The NB2308AI4D belongs to the NB2308A series of 3.3 V zero delay buffers. This series includes variants with different frequency multiplication capabilities (1x, 2x, 4x) and drive strengths (standard vs. high-drive). The 'I' designation in the part number identifies this component as the industrial temperature grade version, distinct from the commercial grade 'C' variant.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. For equivalent functionality, consider other members of the NB2308A family, such as NB2308AC4D for commercial temperature ranges, ensuring the specific configuration requirements match the target application.