NB2305AC1HDR2G

Overview

The NB2305AC1HDR2G is a commercial-grade, 3.3 V zero delay clock buffer manufactured by onsemi. It accepts one reference input and drives five low-skew outputs using an internal phase-locked loop (PLL) that locks to the REF pin via the CLKOUT feedback pad. The device operates within a frequency range of 15 MHz to 133 MHz, supporting CPU and PCI bus frequencies. It features less than 250 ps output-to-output skew and less than 700 ps device-to-device skew. The component utilizes advanced 0.35 µm CMOS technology and is housed in an 8-pin SOIC package.

Feature Summary

• Zero input-to-output propagation delay with less than 350 ps maximum delay
• Five buffered clock outputs with less than 250 ps output-to-output skew
• Internal PLL feedback obtained from the CLKOUT pad for stable locking
• Cycle-to-cycle jitter less than 200 ps at 66.67 MHz

Applications

• High-speed clock distribution in PC and workstation systems
• Datacom and telecom equipment requiring precise timing
• Pentium/C0082 based systems compatible clocking
• PCI bus frequency distribution

Procurement Notes

Verify the ordering suffix 'R2' corresponds to tape and reel packaging containing 2500 units per reel. Confirm the 'C1' designation indicates the commercial temperature range (0°C to 70°C). Ensure the 'H' suffix is recognized as the high-drive variant with faster rise and fall times compared to standard -1 devices. Check RoHS compliance status indicated by the 'G' suffix if lead-free components are required.

Selection Notes

Select this part when a single reference clock must be distributed to five loads with minimal skew. The -1H version provides higher drive capability and faster transition times compared to the standard -1 version. Ensure all outputs, including CLKOUT, have equal capacitive loading to maintain zero input-to-output delay characteristics. Verify supply voltage stability between 3.0 V and 3.6 V for proper operation.

Part Context

This component belongs to the NB2305A family of 3.3 V zero delay buffers. It is functionally similar to the NB2304A but provides five outputs instead of four. The NB2305A series is designed for high-performance applications requiring precise clock synchronization across multiple destinations without external delay compensation circuits.

Replacement Considerations

NB2304AC1HDR2G offers identical electrical specifications but provides only four buffered outputs instead of five. CY2305C from Cypress Semiconductor serves as a comparable alternative in the same category of 3.3 V zero delay buffers.