NB2309AC1DG

Overview

The NB2309AC1DG 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 nine low-skew outputs (4 + 4 + 1) using an on-chip PLL that locks to the REF pin. The device operates within a frequency range of 15 MHz to 133 MHz and features less than 200 ps cycle-to-cycle jitter. It is housed in a 16-pin SOIC package with commercial temperature rating (0°C to 70°C).

Feature Summary

• Zero input-output propagation delay achieved via internal PLL feedback.
• Output-to-output skew guaranteed at less than 250 ps.
• Device-to-device skew limited to less than 700 ps.
• Test mode allows bypassing the PLL for direct input-to-output signal routing.

Applications

• High-speed clock distribution in PC systems.
• Clock buffering for workstations and datacom equipment.
• Telecommunications infrastructure requiring low-jitter signals.

Procurement Notes

Verify the ordering suffix 'G' indicates a lead-free package compliant with RoHS standards. Confirm the 'C1' designation corresponds to the commercial operating temperature range of 0°C to 70°C. Ensure the 'D' suffix matches the required 16-pin SOIC physical footprint for PCB layout compatibility.

Selection Notes

Select this component when a single reference clock must be distributed to multiple loads with minimal skew. The NB2309A supports up to 133 MHz operation. For higher drive strength requirements, consider the -1H variant. Ensure all outputs, including CLKOUT, have equal capacitive loading to maintain zero delay characteristics.

Part Context

This part belongs to the NB2309A family of 3.3 V zero delay buffers. It serves as a versatile solution for distributing CPU and PCI bus frequencies. The device integrates advanced 0.35 µm CMOS technology to provide low power consumption while maintaining high-speed performance capabilities.

Replacement Considerations

Compatible substitutes include the NB2309AI1DG for industrial temperature ranges or the NB2309AC1HDG for high-drive applications. Cross-vendor equivalents such as the ICS2309 may offer similar functionality but require verification of pinout and electrical specifications.