NB2309AI1HDTG

Overview

The NB2309AI1HDTG is a 3.3 V zero delay clock buffer manufactured by onsemi, designed to distribute high-speed clocks with low skew. It accepts one reference input and drives nine outputs grouped as four plus four plus one. The device operates within a frequency range of 15 MHz to 133 MHz and features an internal PLL that locks to the REF pin. It utilizes advanced 0.35 µm CMOS technology and supports spread spectrum clocking inputs. The component is housed in a 16-pin TSSOP package (CASE 948F) and is rated for industrial and commercial temperature ranges.

Feature Summary

• Zero Input-Output Propagation Delay
• Output-to-Output Skew Less than 250 ps
• Device-to-Device Skew Less than 700 ps
• Less than 200 ps Cycle-to-Cycle Jitter

Applications

• CPU Clock Distribution
• PCI Bus Frequency Distribution
• Pentium/C0082 Based Systems

Procurement Notes

Verify the specific ordering suffix 'DT' corresponds to the TSSOP-16 package configuration. Confirm RoHS compliance status and lead-free packaging details directly from the manufacturer's documentation prior to procurement.

Selection Notes

Select this model when nine buffered clock outputs are required with minimal skew. Ensure the load capacitance matches the operating frequency requirements: 30 pF below 100 MHz and 10 pF between 100 MHz and 133 MHz. Verify power supply voltage stability within the 3.0 V to 3.6 V range.

Part Context

This part belongs to the NB2309A series of 3.3 V zero delay buffers. The -1H designation indicates a high-drive version with faster rise and fall times compared to standard -1 devices. It shares functional similarities with other members like the NB2305A but provides a higher output count in a 16-pin form factor.

Replacement Considerations

NB2309AI1DG serves as a SOIC-16 equivalent. NB2309AI1HDTR2G offers the same functionality in a tape and reel format. Cross-reference with NB2309A1 for base drive specifications if lower current requirements apply.

FAQ

How is zero input-output delay achieved?

All outputs, including CLKOUT, must be uniformly loaded. Even if CLKOUT is unused, it requires a capacitive load equal to other outputs to maintain zero delay.

What is the function of the Select inputs?

Select inputs allow Bank B outputs to be three-stated or enable direct application of the input clock to outputs for testing purposes.

Can multiple NB2309A devices share an input clock?

Yes, multiple devices can accept the same input clock, with guaranteed device-to-device skew of less than 700 ps.