For PLL chips, digikey notes the "Ratio - Input:Output". For example, here are two 74HCT4046 ICs:
- This TI chip has a "Ratio - Input:Output" of "1:4"
- This NXP chip has a "Ratio - Input:Output" of "2:3"
What does this "Ratio - Input:Output" mean?
Why does it vary for different 74HCT4046 ICs? Are not all 74HCT4046 made (more or less) equal?
I've searched both datasheets for the term (or a similar one), and I can't find any explanation. The word "ratio" doesn't appear at all in the TI datasheet. "Ratio" does show up in the NXP datasheet, but it seems to be in a different context.