NB2308AI4DG

Overview

The NB2308AI4DG is a 3.3 V zero delay clock buffer manufactured by onsemi, designed for high-speed clock distribution in industrial environments. It features an internal phase-locked loop (PLL) that locks to an input clock presented on the REF pin, with feedback driven from one of the outputs to the FBK pin. The device provides eight LVCMOS outputs organized into two banks of four, supporting a frequency range of 15 MHz to 133.3 MHz. It guarantees an input-to-output propagation delay of less than 250 ps and output-to-output skew of less than 200 ps. The part operates within a supply voltage range of 3.0 V to 3.6 V and is housed in a 16-pin SOIC package.

Feature Summary

• Zero Delay Buffer: Input-to-output propagation delay is adjustable via capacitive load on the FBK input, ensuring synchronization between reference and output clocks.
• Frequency Multiplication: Configured as the 'x4' variant, it enables 2X clock multiplication on all outputs when the feedback path includes a counter.
• Low Skew Performance: Guarantees output-to-output skew of less than 200 ps and device-to-device skew of less than 700 ps.
• Configurable Output Banks: Two banks of four outputs each can be controlled independently via select inputs S1 and S2, allowing tri-stating or bypass modes.

Applications

• High-speed clock distribution in industrial datacom and telecom systems.
• Synchronization of multiple components requiring precise timing alignment.
• System testing applications utilizing the direct clock bypass mode.

Procurement Notes

Verify the specific suffix 'DG' indicates a Pb-free package in the SOIC-16 format. Confirm the operating temperature range corresponds to the Industrial grade (-40°C to +85°C). Ensure the design utilizes the correct feedback configuration to achieve the intended 2X frequency multiplication characteristic of the x4 device variant.

Selection Notes

Select this component when a 2X frequency multiplier with low skew is required for industrial temperature ranges. Compare against NB2308AC4DG for commercial temperature variants or NB2308AI4DTG if TSSOP packaging is preferred. Ensure the load capacitance requirements (15 pF for >100 MHz) are met to maintain specified jitter and rise/fall times.

Part Context

This part belongs to the NB2308A family of 3.3 V zero delay buffers. The 'I' suffix denotes Industrial temperature rating, while '4' specifies the 2X frequency multiplication capability. The 'DG' suffix identifies the Pb-free SOIC-16 package option. Other family members include x1, x2, x3, and x5H configurations with varying multiplication factors and drive strengths.

Replacement Considerations

NB2308AC4DG serves as the commercial temperature equivalent. NB2308AI4DTG offers the same electrical specifications in a TSSOP-16 package. Cross-model substitution requires verifying the temperature range and physical footprint compatibility.