[sdiy] 74HC4046 spec -- Thanks

[Scott Gravenhorst]

Thank you to those who pointed out that the 74HC4046 VCO is
spec'd at some 12 MHz max.  I've downloaded (but not fully
read) three spec sheet PDFs for this part.  I noticed right
off the bat that it has an additional phase comparator (III)
over the CD4046 version.

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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