NB2308AC5HD

Overview

The NB2308AC5HD is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for high-speed clock distribution in commercial applications (0°C to +70°C). It features an internal Phase-Locked Loop (PLL) that locks the input reference frequency (15 MHz to 133 MHz) presented on the REF pin to the outputs via the FBK pin. The device provides eight LVCMOS outputs organized into two banks of four, with output-to-output skew guaranteed at less than 200 ps and device-to-device skew under 700 ps. This specific variant is the high-drive version with a REF/2 divider enabled on both output banks.

Feature Summary

• Zero input-output propagation delay adjustable by capacitive load on the FBK input
• High-drive capability with faster rise and fall times compared to standard versions
• REF/2 frequency division applied to both Bank A and Bank B outputs
• Cycle-to-cycle jitter less than 200 ps at 66.67 MHz with 15 pF load

Applications

• High-speed clock distribution systems operating between 15 MHz and 133 MHz
• Communication equipment requiring low-skew clock synchronization
• System testing modes utilizing direct reference bypass

Procurement Notes

Verify the package suffix 'D' corresponds to the SOIC-16 form factor as specified in the ordering information. Confirm the 'C' designation indicates the commercial temperature range of 0°C to +70°C. Ensure the '5H' configuration matches the requirement for REF/2 division on both banks. Check for Pb-free availability if required, which utilizes the 'G' suffix.

Selection Notes

Select this part when a high-drive output is necessary for the REF/2 configuration. Standard versions (-1, -2, -3, -4) have slower rise/fall times. If industrial temperature range (-40°C to +85°C) is needed, choose the AI suffix instead of AC. Verify that the feedback loop can be closed from either bank to achieve the desired zero-delay alignment.

Part Context

This component belongs to the NB2308A family of 3.3 V zero delay buffers. The '5H' designation specifically identifies the high-drive variant with REF/2 functionality on both output banks. Other family members include standard drive versions (-1, -2, -3, -4) and different multiplication factors. The device uses advanced 0.35 µm CMOS technology.

Replacement Considerations

NB2308AI5HD offers the same electrical characteristics but operates in the industrial temperature range (-40°C to +85°C). NB2308AC5HDT provides the same function in a TSSOP-16 package instead of SOIC-16.