NB2308AC4DG

Overview

The NB2308AC4DG is a commercial-grade, 3.3 V zero delay clock buffer manufactured by onsemi. It features an internal phase-locked loop (PLL) that locks to an input clock presented on the REF pin, with feedback driven from one of the outputs to the FBK pin. The device provides eight LVCMOS outputs organized into two banks of four. It supports a 2X frequency multiplication configuration where all outputs generate clocks at twice the reference frequency. Key electrical parameters include an operating supply voltage range of 3.0 V to 3.6 V and an input frequency range of 15 MHz to 133 MHz.

Feature Summary

• Zero delay buffer with adjustable input-to-output propagation delay via capacitive load on the FBK input
• Internal PLL ensures output-to-output skew less than 200 ps within the same bank
• Two banks of four outputs each, controllable via S1 and S2 select inputs for tri-state or direct drive modes
• Cycle-to-cycle jitter less than 200 ps under standard loading conditions

Applications

• High-speed clock distribution in PC and workstation systems
• Datacom and telecom equipment requiring low-skew clocking
• System testing applications utilizing bypass mode for direct input clock application

Procurement Notes

Verify the specific ordering suffix 'DG' corresponds to the Pb-free SOIC-16 package variant as listed in the manufacturer's ordering information table. Confirm the 'C' suffix indicates the commercial temperature range (0°C to 70°C). Ensure compatibility with the required 3.3 V supply and check for any end-of-life notices associated with this specific part number revision.

Selection Notes

Select the NB2308AC4DG when a fixed 2X frequency multiplication is required across all eight outputs. This model differs from the NB2308AC1DG (reference frequency) and NB2308AC2DG (variable 1X/2X based on feedback source). Ensure the application requires the commercial temperature range; use the 'I' suffix version for industrial temperatures (-40°C to 85°C). Verify that the 16-pin SOIC package fits the PCB layout constraints.

Part Context

This component belongs to the NB2308A family of 3.3 V zero delay buffers. The base part number NB2308A encompasses multiple configurations (x1, x2, x3, x4, x5H) offering different frequency multiplication options. The AC4DG designation specifically identifies the commercial temperature grade, 2X multiplier function, and Pb-free SOIC-16 packaging within this versatile series designed for high-performance clock distribution.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.