NB2308AI1HDG

Overview

The NB2308AI1HDG is a 3.3 V zero delay clock buffer from onsemi, designed for high-speed clock distribution in PC, workstation, datacom, and telecom applications. It features an on-chip PLL that locks to an input clock presented on the REF pin, with feedback driven to the FBK pin. The device operates within an input frequency range of 15 MHz to 133 MHz and provides eight buffered outputs organized into two banks of four. It guarantees an input-to-output propagation delay of less than 250 ps and output-to-output skew of less than 200 ps. The part is housed in a 16-pin SOIC package and supports industrial temperature ranges.

Feature Summary

• Zero input-output propagation delay adjustable by capacitive load on the FBK input
• Multiple configurations available including reference, 2X, and 4X frequencies via feedback selection
• Low-skew performance with output-to-output skew less than 200 ps and device-to-device skew less than 700 ps
• Two banks of four outputs each, controllable by select inputs S1 and S2

Applications

• PC clock distribution
• Workstation clock distribution
• Datacom systems
• Telecom equipment

Procurement Notes

Verify the specific configuration suffix (e.g., x1H) against design requirements, as the base model number covers multiple frequency multiplication options. Confirm the 'I' designation indicates industrial temperature operation (-40°C to +85°C). Ensure the 'D' suffix matches the required SOIC-16 package type. Check RoHS compliance status if lead-free packaging is mandatory for the assembly process.

Selection Notes

Select the appropriate sub-model based on desired frequency multiplication; the NB2308Ax1H variant provides reference frequency outputs with faster rise/fall times. Ensure all outputs are uniformly loaded to achieve zero delay between input and output. Verify that the load capacitance does not exceed 15 pF for frequencies above 100 MHz. Use the Select Input Decoding Table to configure bypass or PLL modes as needed for system testing.

Part Context

This component belongs to the NB2308A family of 3.3 V zero delay buffers. Variants include commercial (C) and industrial (I) temperature grades, and packages such as SOIC-16 (D) and TSSOP-16 (DT). The 'H' suffix denotes high-drive versions with improved transition speeds compared to standard variants.

Replacement Considerations

Public confirmed substitute part numbers: NB2308AC1HDG, NB2308AI1DR2G.