NB2309AC1DT

Overview

The NB2309AC1DT is a commercial-grade, 3.3 V zero delay clock buffer manufactured by onsemi. It accepts one reference input and drives nine low-skew outputs (configured as two banks of four plus one feedback output). The device utilizes an internal PLL to lock to the REF pin, ensuring zero input-to-output propagation delay when outputs are uniformly loaded. Operating frequencies range from 15 MHz to 133 MHz with cycle-to-cycle jitter under 200 ps. It is housed in a 16-pin TSSOP package.

Feature Summary

• Zero input-to-output propagation delay via internal PLL feedback
• One input drives nine outputs with less than 250 ps output-to-output skew
• Device-to-device skew guaranteed less than 700 ps for multi-device distribution
• Test mode allows bypassing the PLL to apply the input clock directly to outputs

Applications

• High-speed clock distribution in CPU and PCI bus systems
• Multi-device clock synchronization requiring low skew
• System testing via PLL bypass mode

Procurement Notes

Verify the ordering suffix 'DT' corresponds to the TSSOP-16 package configuration. Confirm the 'C1' designation indicates the commercial temperature range (0°C to 70°C) and standard drive strength (-1), distinct from the high-drive '-1H' variants. Ensure RoHS compliance requirements are met if lead-free packaging is necessary.

Selection Notes

Select this component for applications requiring a single reference clock to drive multiple loads with minimal skew. Ensure all outputs, including CLKOUT, have equal capacitive loading to maintain zero delay characteristics. Verify that the load capacitance requirements align with the operating frequency: 30 pF for frequencies below 100 MHz and 10 pF for frequencies between 100 MHz and 133 MHz.

Part Context

This part belongs to the NB2309A family of 3.3 V zero delay buffers. The specific suffix 'C1' denotes the commercial temperature grade and standard drive capability, while 'DT' specifies the thin-shrink small-outline package. Other variants in the series include industrial temperature grades ('I') and high-drive versions ('H').

Replacement Considerations

Public confirmed substitutes include Microchip Technology PL123-09SC and PL123-09SC-R.