NB2308AI1HDT

Overview

The NB2308AI1HDT is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for high-speed clock distribution. It features an internal PLL that locks to a reference input on the REF pin, with feedback provided via the FBK pin. The device provides eight outputs divided into two banks of four, controlled by select inputs S1 and S2. It operates within a frequency range of 15 MHz to 133 MHz and supports an industrial temperature range of -40°C to +85°C. Packaged in a TSSOP-16 surface-mount case, it ensures low skew characteristics with output-to-output skew less than 200 ps and device-to-device skew less than 700 ps.

Feature Summary

• Zero delay buffer with adjustable input-to-output propagation delay via capacitive load on the FBK pin.
• High-drive version (suffix H) with faster rise and fall times compared to standard variants.
• Two selectable output banks (Bank A and Bank B) allowing independent three-stating or direct clock application.
• Low cycle-to-cycle jitter of less than 200 ps at 66.67 MHz with loaded outputs.

Applications

• Distributing high-speed clocks in systems requiring precise timing alignment.
• Multi-device clock distribution where inter-device skew must be minimized.
• System testing configurations utilizing direct bypass mode for reference clock routing.

Procurement Notes

Verify the specific ordering suffix 'DT' confirms the TSSOP-16 package and 'I' indicates the industrial temperature grade (-40°C to +85°C). Confirm RoHS compliance status if required, as Pb-free versions carry a 'G' suffix. Check current availability as this component may be subject to end-of-life notices or supply constraints.

Selection Notes

Select the NB2308AI1HDT when a high-drive output capability is required alongside industrial temperature operation. Ensure the feedback path configuration matches the desired frequency multiplication or division ratio defined in the NB2308A configurations table. Verify that the load capacitance requirements (15 pF for frequencies above 100 MHz) are met to maintain specified timing parameters.

Part Context

This part belongs to the NB2308A family of 3.3 V zero delay buffers. The 'I' suffix denotes industrial temperature rating, while 'H' indicates the high-drive output variant. The 'DT' suffix specifies the TSSOP-16 package. Other family members include commercial temperature grades ('C') and standard drive versions without the 'H' suffix.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical specifications against alternative zero-delay buffers from other manufacturers if sourcing this discontinued or limited-stock item.