NB2308AI3DTG

Overview

The NB2308AI3DTG is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for distributing high-speed clocks in industrial environments. It features an internal PLL that locks to a reference clock input and provides eight buffered outputs organized into two banks of four. The device supports multiple frequency configurations based on the feedback source selection. 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 a maximum output frequency of 133.3 MHz. It guarantees less than 250 ps input-to-output propagation delay and less than 200 ps output-to-output skew.

Feature Summary

• Zero Delay Buffer with adjustable input-to-output propagation delay via capacitive load on the FBK pin
• Multiple configuration options allowing reference, 2X, or 4X frequencies depending on feedback path selection
• Low-skew performance with guaranteed output-to-output skew under 200 ps and device-to-device skew under 700 ps
• Two banks of four outputs each, controllable via select inputs for three-stating or bypass modes

Applications

• High-speed clock distribution systems requiring low skew
• Multi-board synchronization where device-to-device skew must be minimized
• Systems requiring configurable clock multiplication (2X or 4X) from a single reference
• Industrial equipment requiring robust clock buffering across extended temperature ranges

Procurement Notes

Verify the specific suffix 'DTG' corresponds to the TSSOP-16 package and Pb-Free status as defined in the ordering information table. Confirm the 'I' designation indicates the Industrial temperature range (-40°C to +85°C). Ensure the application circuit matches the required configuration (NB2308Ax3) regarding feedback source and output frequency requirements before procurement.

Selection Notes

Select this component when an industrial temperature range is required alongside the NB2308Ax3 configuration capabilities. Verify that the PCB layout allows for equal loading on all outputs to achieve zero delay characteristics. Check if the TSSOP-16 package dimensions fit the design constraints compared to the SOIC-16 alternative. Ensure the power supply decoupling meets the recommendations for stable PLL lock time.

Part Context

This part belongs to the NB2308A family of 3.3 V zero delay buffers. The 'I' suffix denotes the Industrial temperature grade, while 'DTG' specifies the TSSOP-16 package with lead-free construction. Other variants in the series include commercial grades ('C'), different packages ('D' for SOIC), and non-Pb-free versions lacking the 'G' suffix. The '3' indicates the specific internal configuration supporting 4X/2X frequency multiplication.

Replacement Considerations

Direct replacements within the same family include NB2308AC3DTG for commercial temperature applications or NB2308AI3DG for the SOIC-16 package variant. Cross-manufacturer equivalents such as Cypress CY2305 series may offer similar functionality but require verification of pinout compatibility and electrical parameters against the NB2308A datasheet.