NB2305AC1D

Overview

The NB2305AC1D is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for distributing high-speed clocks in commercial applications. It accepts one reference input and drives five low-skew CMOS outputs using an internal Phase Locked Loop (PLL). The device operates within a frequency range of 15 MHz to 133 MHz and supports CPU and PCI bus frequencies. Key electrical specifications include an output-to-output skew of less than 250 ps, cycle-to-cycle jitter under 200 ps, and an input-output propagation delay guaranteed at less than 350 ps. It is housed in an 8-pin SOIC package.

Feature Summary

• Zero Input-Output Propagation Delay via internal PLL feedback
• Five Low-Skew Outputs with skew less than 250 ps
• Device-to-Device Skew less than 700 ps when multiple devices share an input
• Compatible with Pentium/C0082 based systems due to low jitter

Applications

• High-speed clock distribution in PC and workstation architectures
• PCI Bus frequency synchronization
• CPU clock buffering for Pentium-based systems

Procurement Notes

Verify the specific suffix 'C' indicates the Commercial temperature range (0°C to 70°C) and '1' denotes the base drive version. Confirm package type is SOIC-8. Check for Pb-Free availability if required, which uses the 'G' suffix (e.g., NB2305AC1DG). Ensure the design accounts for the weak pulldown on all outputs and the REF pin threshold voltage.

Selection Notes

Select the NB2305AC1D for commercial temperature environments requiring five buffered outputs from a single source. Choose the '-1H' variant (NB2305AC1HD) if faster rise and fall times are necessary, as it offers higher drive capability compared to the standard '-1' version. Ensure load capacitance requirements are met: 30 pF for frequencies below 100 MHz and 10 pF for frequencies between 100 MHz and 133 MHz.

Part Context

This component belongs to the NB2305A family of 3.3 V Zero Delay Clock Buffers. It shares functional similarities with other members like the NB2304A (quad output) and NB2308A (octal output). The part utilizes advanced 0.35 µm CMOS technology and is available in both SOIC-8 and TSSOP-8 packages depending on the ordering suffix.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified local source material.