NB2308AI5HDG

Overview

The NB2308AI5HDG 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 (REF) and provides eight buffered outputs divided into two banks of four. The device operates within a frequency range of 15 MHz to 133.3 MHz with a supply voltage between 3.0 V and 3.6 V. It guarantees an input-to-output propagation delay of less than 250 ps and output-to-output skew under 200 ps. The specific AI5H suffix indicates an industrial temperature rating (-40°C to +85°C), high-drive capability, and REF/2 division on both output banks.

Feature Summary

• Zero Delay Buffer: Internal PLL ensures input-to-output propagation delay < 250 ps.
• Low Skew Performance: Output-to-output skew < 200 ps; device-to-device skew < 700 ps.
• Configurable Outputs: Two banks of four outputs (CLKA1-4, CLKB1-4) controllable via S1/S2 select inputs.
• High Drive & Frequency: Supports up to 133.3 MHz with rise/fall times as fast as 1.25 ns at 15 pF load.

Applications

• Distributing high-speed clocks in PC and workstation architectures.
• Clock distribution in datacom and telecom equipment.
• System testing applications requiring direct reference bypass mode.

Procurement Notes

Verify the ordering suffix 'I' for industrial temperature range (-40°C to +85°C) and '5H' for the specific REF/2 configuration. Confirm package type 'D' corresponds to SOIC-16 or 'DT' for TSSOP-16 as required by the design. Check RoHS compliance status indicated by the 'G' suffix if lead-free components are mandatory for the assembly process.

Selection Notes

Select this component when low skew and zero delay are critical for clock distribution networks. Ensure the feedback pin (FBK) load matches the output loads to maintain zero delay characteristics. Verify that the 3.3 V supply voltage aligns with the system power rails and that the 16-pin package fits the PCB footprint constraints.

Part Context

This part belongs to the NB2308A series of 3.3 V zero delay buffers. Variants differ by output drive strength (standard vs. H versions), frequency multiplication capabilities (x1 to x5 configurations), and temperature grades (C for commercial, I for industrial). The NB2308AI5HDG specifically combines industrial grade, high drive, and dual-bank REF/2 functionality.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult onsemi for current generation replacements or verify pin-compatible alternatives such as other members of the NB2308A family with matching electrical specifications.