NB2308AI2HDTG

Overview

The NB2308AI2HDTG is a 3.3 V zero delay clock buffer manufactured by onsemi, utilizing advanced 0.35 µm CMOS technology. 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; specifically, the AI2 variant allows for 2X and 1X frequencies depending on the feedback source. Key electrical parameters include an operating voltage range of 3.0 V to 3.6 V, an input frequency range of 15 MHz to 133 MHz, and output-to-output skew less than 200 ps. It is housed in a TSSOP-16 package.

Feature Summary

• Zero Delay Buffer with adjustable input-to-output propagation delay via capacitive load on the FBK pin.
• Two banks of four outputs each, controllable via select inputs (S1, S2) for three-stating or direct bypass.
• Low-skew performance with output-to-output skew < 200 ps and device-to-device skew < 700 ps.
• Supports 2X and 1X frequency outputs based on feedback connection from Bank A or Bank B.

Applications

• Distribution of high-speed clocks in computing systems.
• System testing applications requiring direct input clock application to outputs.
• Multi-device clock distribution networks requiring low skew synchronization.

Procurement Notes

Verify the ordering suffix 'DTG' corresponds to the TSSOP-16 package and industrial/commercial temperature range (-40°C to +85°C). Confirm RoHS compliance and lead-free status as specified in the datasheet. Check current availability status as product lifecycles may change.

Selection Notes

Select the NB2308AI2HDTG when 2X and 1X frequency outputs are required on different banks. Ensure the feedback path configuration matches the desired frequency multiplication. Verify load capacitance requirements (15 pF for >100 MHz, 30 pF for <100 MHz) to maintain timing specifications.

Part Context

This component belongs to the NB2308A family of 3.3 V zero delay buffers. The AI2H variant specifically enables flexible frequency scaling by allowing users to obtain 2X and 1X frequencies on each output bank depending on which output drives the feedback pin.

Replacement Considerations

Compatible parts within the same family include NB2308AI1HDTG, NB2308AI3HDTG, NB2308AI4HDTG, and NB2308AI5HDTG. Selection depends on specific frequency multiplication requirements (Reference, 2X, 4X, or REF/2).

FAQ

How is zero input-to-output delay achieved?

Zero delay is achieved by ensuring all outputs, including the one driving the FBK pin, are uniformly loaded. Adjustments can be made by varying the capacitive load difference between the FBK pin and other outputs.

What is the function of the Select Inputs (S1, S2)?

The select inputs control the output state and PLL operation. They allow Bank A and Bank B outputs to be three-stated, driven directly by the reference clock (bypass mode), or driven by the PLL.

What is the maximum input frequency supported?

The device supports an input frequency range from 15 MHz to 133 MHz.