PLL with bypass — when to use it
The PLL with bypass gives two operating modes: in PLL mode, the internal phase-locked loop cleans jitter from the incoming reference, useful when the source clock has accumulated noise from a long board trace or a less clean oscillator. In bypass mode, the input clock passes through to the outputs with minimal added delay, preserving the original timing for applications where deterministic latency or a known phase relationship matters. The part does not include an internal divider or multiplier — the ratio is fixed at 2:12, so the output frequency equals the input frequency.
Active lifecycle and sourcing posture
The 9ZML1253EKILF is listed as Active with no end-of-life notice. No second-source or pin-compatible alternate is listed in the official record, so BOM qualification should be based on this exact order code.