NB2309AC1HDTG

Overview

The NB2309AC1HDTG is a 3.3 V zero delay clock buffer manufactured by onsemi, utilizing advanced 0.35 µm CMOS technology. It accepts one reference input and drives nine low-skew outputs (4 + 4 + 1 configuration). The -1H variant supports frequencies up to 133 MHz with higher drive capability than the standard -1 version. Key electrical parameters include an output-to-output skew of less than 250 ps, device-to-device skew under 700 ps, and cycle-to-cycle jitter below 200 ps. The REF input is 5 V tolerant, and the device operates within a supply voltage range of 3.0 V to 3.6 V.

Feature Summary

• Zero input-to-output propagation delay achieved through internal PLL feedback from CLKOUT
• High drive strength -1H version with faster rise/fall times compared to standard -1 devices
• Configurable output banks via Select inputs (S1, S2) allowing three-stating or direct bypass modes
• Low cycle-to-cycle jitter (< 200 ps) suitable for Pentium-based systems

Applications

• Distribution of high-speed clocks in CPU and PCI bus architectures
• System testing via test mode that bypasses the PLL
• Multi-device clock distribution where inter-device skew must be minimized

Procurement Notes

Verify the ordering suffix matches the required package and temperature grade. The 'DT' suffix indicates a TSSOP-16 package, while 'D' denotes SOIC-16. The 'G' suffix signifies a lead-free package. The 'C1' designation confirms commercial temperature range operation (0°C to 70°C), whereas 'I1' indicates industrial range (-40°C to 85°C). Confirm the specific revision status as datasheets may update.

Selection Notes

Select the NB2309AC1HDTG when higher drive current and faster transition times are required compared to the standard NB2309AC1DT. Ensure load capacitance requirements are met: 30 pF for frequencies below 100 MHz and 10 pF for frequencies between 100 MHz and 133 MHz. For zero delay performance, all outputs including CLKOUT must have equal capacitive loading. Verify that the 5 V tolerant REF input aligns with the system's reference signal levels.

Part Context

This component belongs to the NB2309A family of zero delay buffers. The NB2309AC1HDTG specifically represents the commercial temperature grade (-1H) variant housed in a TSSOP-16 package. It serves as a high-performance alternative to the standard NB2309AC1DT, offering enhanced drive capabilities while maintaining the same functional block diagram and pinout compatibility within the series.

Replacement Considerations

Direct substitutes within the same family include NB2309AC1DT (standard drive, same package) or NB2309AI1HDT (industrial temperature grade). Cross-package equivalents like NB2309AC1HD (SOIC-16) share identical electrical characteristics but differ in physical footprint.