NB2305AI1DG

Overview

The NB2305AI1DG is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for high-speed clock distribution in PC, workstation, and datacom applications. It accepts one reference input and drives five low-skew outputs using an internal Phase-Locked Loop (PLL). The device operates within a frequency range of 15 MHz to 133 MHz and supports industrial temperature conditions from -40°C to +85°C. Packaged in an 8-pin SOIC (D suffix) with lead-free construction, it ensures zero input-output propagation delay when outputs are uniformly loaded. Key electrical specifications include output-to-output skew less than 250 ps, cycle-to-cycle jitter under 200 ps, and supply current ranging from 19 mA to 50 mA depending on load and frequency.

Feature Summary

• Zero Input-Output Propagation Delay achieved via internal PLL feedback on the CLKOUT pin
• Five Low-Skew Outputs with Output-to-Output Skew < 250 ps and Device-to-Device Skew < 700 ps
• Low Jitter Performance with Cycle-to-Cycle Jitter < 200 ps
• Industrial Temperature Range (-40°C to +85°C) and 3.3 V Operation

Applications

• High-speed clock distribution in PC and workstation systems
• Datacom and telecom equipment requiring precise clock alignment
• Pentium/C008 based systems compatible with CPU and PCI bus frequencies

Procurement Notes

Verify the ordering suffix 'DG' confirms the Industrial temperature grade (-40°C to +85°C), SOIC-8 package, and Pb-Free status as listed in the official onsemi ordering table. Confirm availability status directly with authorized distributors, as specific stock levels fluctuate. Ensure the application design accounts for the requirement that all outputs, including the unused CLKOUT pin if applicable, must be equally loaded to maintain zero delay characteristics.

Selection Notes

Select the NB2305AI1DG over commercial variants when operation in temperatures below 0°C is required. The 'I' suffix denotes the industrial grade, while 'G' indicates lead-free packaging. For tape and reel manufacturing, consider the DR2 suffix variants instead of the rail-packaged D suffix. Ensure the system load capacitance matches the datasheet requirements: 30 pF for frequencies below 100 MHz and 10 pF for frequencies between 100 MHz and 133 MHz to maintain specified timing parameters.

Part Context

The NB2305A series includes base parts (suffix -1) and high-drive versions (suffix -1H) with faster rise and fall times. The NB2305AI1DG corresponds to the standard drive industrial version in an SOIC-8 package. Related family members include the NB2304A (quad output) and NB2308A (octal output), which share similar zero-delay buffer architectures but differ in pin count and output capacity.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Cross-referencing with other manufacturers requires verifying pin compatibility, voltage levels, and timing specifications against the NB2305A datasheet.