NB2305AI1HDTG

Overview

The NB2305AI1HDTG is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for distributing high-speed clocks in industrial applications. It accepts one reference input and drives five low-skew outputs using an internal PLL locked to the REF pin. The device operates within a frequency range of 15 MHz to 133 MHz and utilizes advanced 0.35 µm CMOS technology. Key electrical specifications include an output-to-output skew of less than 250 ps, cycle-to-cycle jitter under 200 ps, and propagation delays guaranteed below 350 ps. It is housed in an 8-pin TSSOP package.

Feature Summary

• Zero Input-Output Propagation Delay with internal PLL feedback from CLKOUT
• High Drive Capability: Faster rise/fall times (1.5 ns) compared to standard -1 variants
• Low Skew Performance: Output-to-output skew < 250 ps; Device-to-device skew < 700 ps
• Industrial Temperature Range: Operates from -40°C to +85°C

Applications

• Distribution of CPU and PCI bus frequencies
• Clock distribution in Pentium/C0082 based systems
• Multi-device clock synchronization requiring low skew

Procurement Notes

Verify component authenticity through authorized channels as counterfeit risks exist for legacy semiconductor parts. Confirm RoHS compliance status via the specific manufacturer datasheet revision, as Pb-free packaging options are available but distinct from standard versions. Ensure storage conditions account for moisture sensitivity levels prior to soldering.

Selection Notes

Select the NB2305AI1HDTG over the standard NB2305AI1DTG when higher drive strength and faster transition times are required. The 'I' suffix indicates industrial temperature rating (-40°C to +85°C), while 'C' denotes commercial grade. The 'H' variant provides superior slew rates suitable for heavier loads or stricter timing margins compared to non-H versions.

Part Context

This part belongs to the NB2305A family of 3.3 V zero delay buffers. It shares functional architecture with the NB2304A and NB2308A series but differs in pin count and output configuration. The AI1HDTG specifically combines industrial temperature rating, high-drive outputs, and TSSOP-8 packaging.

Replacement Considerations

Direct pin-compatible replacements include other NB2305A variants with adjusted drive or temperature ratings. Cross-manufacturer equivalents such as Cypress CY2305C may offer similar functionality but require verification of electrical parameters and package dimensions.