[time-nuts] 74AC logic differences between manufactures

Javier Herrero jherrero at hvsistemas.es
Wed Jul 14 04:29:59 UTC 2010


Probably none, since Fairchild inherited that product line from National 
Semiconductor.

Regards,

Javier, EA1CRB

El 13/07/2010 21:30, Stanley Reynolds escribió:
> Learning about the differences between families now know why a 74F is not a
> substitute for 74AC.
>
> But remembering something I read in Brooks Shera, W5OJM GPSDO notes "Take care
> about which 4046 chips you use for U1 and U3. The Phillips 74HCT4046 chips
> (formerly sold by Radio Shack) are fine. So are CD74HC4046 chips made by Harris
> or T.I. Do not use chips made by Fairchild and do not use CD4046 chips; both
> have a different design and will not work in this circuit."
>
> Does anyone know about any differences in Fairchild and National Semiconductor
> 74AC175PC ?
>
> Stanley
>
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