NB2308AC2DG

Overview

The NB2308AC2DG 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 eight outputs to the FBK pin. The device provides a 1:8 output ratio and supports frequencies from 15 MHz to 133.3 MHz. It utilizes advanced 0.35 µm CMOS technology and operates within a supply voltage range of 3.0 V to 3.6 V. The component is housed in a 16-pin SOIC package (CASE 751B) and guarantees an input-to-output propagation delay of less than 250 ps.

Feature Summary

• Zero Delay Buffer with adjustable input-to-output propagation delay via capacitive load on the FBK input
• Configurable frequency multiplication: Bank A outputs operate at 2X reference frequency when feedback is sourced from Bank B
• 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 via S1 and S2 select inputs for tri-state or bypass modes

Applications

• High-speed clock distribution systems requiring zero input-to-output delay
• Applications necessitating 2X clock frequency multiplication on specific output banks
• Multi-device clock networks where inter-device skew must be minimized below 700 ps

Procurement Notes

Verify the ordering suffix 'DG' confirms the Pb-Free status and SOIC-16 packaging as specified in the manufacturer's ordering information table. Confirm the 'C' suffix indicates the Commercial temperature range (0°C to 70°C). Ensure the specific configuration matches the required feedback source for the desired 2X frequency operation.

Selection Notes

Select this part when a 2X frequency multiplier is required for one bank of outputs while maintaining reference frequency on the other. Ensure the feedback path connects from a Bank B output to the FBK pin to enable the 2X mode. Verify that the load capacitance requirements (15 pF for >100 MHz, 30 pF for <100 MHz) are met to maintain specified jitter and rise/fall times.

Part Context

This component belongs to the NB2308A family of 3.3 V zero delay buffers. The 'C' designation specifies the commercial operating temperature range, distinguishing it from the industrial 'I' variant. The '2' indicates the specific frequency configuration allowing 2X multiplication, differentiating it from x1, x3, x4, or x5H configurations within the same series.

Replacement Considerations

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