NB2305AI1DR2

Overview

The NB2305AI1DR2 is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for distributing high-speed clocks in industrial temperature ranges (-40°C to +85°C). It accepts one reference input and drives five low-skew outputs with an operating frequency range of 15 MHz to 133 MHz. The device features an internal PLL that locks to the input clock on the REF pin, ensuring zero input-output propagation delay when outputs are uniformly loaded. Key electrical specifications include less than 200 ps cycle-to-cycle jitter, output-to-output skew under 250 ps, and device-to-device skew under 700 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 < 250 ps
• Device-to-Device Skew < 700 ps for multi-chip synchronization
• Cycle-to-Cycle Jitter < 200 ps

Applications

• CPU and PCI Bus Clock Distribution
• Pentium-based System Clocking
• Multi-device clock synchronization networks

Procurement Notes

Verify the specific ordering suffix 'R2' corresponds to the Tape & Reel shipping configuration as listed in the official onsemi ordering information table. Confirm the 'I' suffix indicates the Industrial temperature grade (-40°C to +85°C) and the '1' denotes the base drive version rather than the higher drive '-1H' variant. Ensure compatibility with 3.3 V supply requirements.

Selection Notes

Select this component when zero input-output delay is critical for system timing integrity. The NB2305AI1DR2 is suitable for applications requiring up to 133 MHz operation with strict skew constraints. Note that achieving zero delay requires equal capacitive loading on all outputs, including the CLKOUT feedback pin. For faster rise/fall times, consider the -1H derivative instead.

Part Context

This part belongs to the NB2305A family of 3.3 V zero delay buffers from onsemi (formerly Semiconductor Components Industries, LLC). The family includes commercial variants (suffix C) and industrial variants (suffix I), as well as standard drive (-1) and high drive (-1H) versions. The NB2305A/D datasheet defines the functional characteristics for these derivatives.

Replacement Considerations

Direct replacements within the same family include NB2305AC1DR2 for commercial temperature applications or NB2305AI1HDR2 for industrial applications with higher drive strength. Cross-manufacturer equivalents such as IDT 2305 series devices may share functional parameters but require verification of pinout and electrical tolerances.