[time-nuts] 4046 replacement

Charles Steinmetz csteinmetz at yandex.com
Mon May 7 12:12:55 EDT 2018


donald wrote:

> Question : In the 74HCT9046BCN - does a high on the inhibit line Knobble
> the P/F detectors as well as the VCO?

I've never had occasion to use the INH pin.  The 2009 NXP datasheet says 
it shuts down the whole circuit:

"The inhibit function differs. For the 74HCT4046A a HIGH-level at the 
inhibit input
(pin INH) disables the VCO and demodulator, while a LOW-level turns both 
on. For
the 74HCT9046A a HIGH-level on the inhibit input disables the whole 
circuit to
minimize standby power consumption."

Best regards,

Charles





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