[time-nuts] 4046 replacement

donald collie donaldbcollie at gmail.com
Wed Apr 18 05:40:13 EDT 2018


Thankyou Attila. I remember reading a book on PLL theory, recently,writen
by a very knowledgable fellow, but I didn`t think to make a copy of his
critique of the 4046. I recall that the nub of it was that the 4046 isn`t
suitable for some applications because of a design flaw. Perhaps somebody
in this group could explain further.
Thankyou Bill, for the datasheet on the 74HCT9046, and your comments
Cheers!..............................................................................Don
jnr ZL4GX

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On Wed, Apr 18, 2018 at 8:28 PM, wb6bnq <wb6bnq at cox.net> wrote:

> Hi Donald,
>
> You could consider the NXP 74HCT9046A as a replacement.  It is an improved
> version of 4046.  However, you do need to study the spec sheet as it is a
> bit different, but in a good way.
>
> I have included an attached PDF of the spec sheet, if it makes through the
> mail list server.
>
> Bill....WB6BNQ
>
>
> donald collie wrote:
>
> I have 4  frequency synthesiser projects, each using HEF4046BCN`s, but have
>> recently read that this CMOS IC has a design flaw. What would be a better
>> chip to retrofit? I`m thinking perhaps a HEF74HC4046AN [that`s if it
>> doesn`t have the same bug], or a 74HC7046AN - which is similar. Both these
>> chips are more-or-less pin compatable TIA for any
>> advice!.....................................................
>> ..................................................Don
>>
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