NB2308AC1HD

Overview

The NB2308AC1HD is a commercial-grade, 3.3 V zero delay clock buffer manufactured by onsemi. It features an integrated PLL that locks to an input clock on the REF pin, with feedback driven from one of eight outputs to the FBK pin. The device provides two banks of four buffered clock outputs each, controlled via select inputs S1 and S2. Key electrical parameters include an input frequency range of 15 MHz to 133 MHz, a supply voltage range of 3.0 V to 3.6 V, and an operating temperature range of 0°C to +70°C. Input-to-output propagation delay is guaranteed less than 250 ps, while output-to-output skew is less than 200 ps.

Feature Summary

• Zero delay buffer configuration with adjustable input-to-output propagation delay via capacitive load on the FBK pin.
• Two banks of four outputs (CLKA1-4 and CLKB1-4) with three-state capability controlled by S1 and S2 select inputs.
• Low-skew performance with output-to-output skew less than 200 ps and device-to-device skew less than 700 ps.
• Cycle-to-cycle jitter less than 200 ps at 66.67 MHz with 15 pF load.

Applications

• Distribution of high-speed reference clocks in multi-chip systems.
• Clock buffering for digital signal processing and communication equipment.
• System testing applications requiring direct input clock application to outputs.

Procurement Notes

Verify package availability as the SOIC-16 variant may be subject to discontinuation or limited stock depending on the distributor. Confirm RoHS compliance status if lead-free packaging is required for assembly processes. Check current lifecycle status against project timelines to ensure long-term supply stability.

Selection Notes

Select this part when a single-input, eight-output zero-delay buffer is required for commercial temperature ranges. Ensure the feedback path connects to an output with matching capacitive loading to achieve zero input-to-output delay. Verify that the 3.3 V supply voltage and 133 MHz maximum frequency meet system requirements.

Part Context

This component belongs to the NB2308A family of zero delay buffers. The 'C' suffix indicates commercial temperature operation (0°C to +70°C), while 'H' denotes the high-drive version with faster rise and fall times compared to standard variants. It is functionally similar to other members like NB2308AI1HD but differs in temperature rating.

Replacement Considerations

NB2308AI1HD: Industrial temperature grade (-40°C to +85°C). NB2308AC1D: Standard drive version (slower rise/fall times). NB2308AC1DTG: TSSOP-16 package alternative.