[sdiy] moog module designs

[Scott Gravenhorst]

Thank you, Tim.  I guess it's something to be aware of.  I went to their
site and tried to look up 4027, but it doesn't seem to be there.  

Interesting that they didn't have the "J and K high" condition in their
truth table.  So here's a chicken and egg thing: Did they create the
truth table (incorrectly) and then get engineers to design this or did
they muff the design and then publish a truth table that shows the chip's
implementation?  Either way, that's pretty brain dead.

IMHO, that just is NOT a JK, and it's NOT a 4027.


In any case, I will keep this information handy and NEVER buy anything
from ST Micro...




"Tim Daugard" <daugard at sprintmail.com> wrote:
>Scot and y'all,
>
>> This is clearly contrary to the spec sheet from Philips, and I'll bet
>> that's true of all makers, otherwise they couldn't really call it a
>4027,
>> and in fact, I don't believe they can call a flip-flop like this a
>true
>> JK.  IMHO, these are broken.  This comment attracted my attention
>because
>> I like to play with 4xxx series CMOS and 4027 is one of my favorite
>toys.
>>  Can you give the manufacturer(s) that produced junk 4027s like this ?
>
>I checked my data sheets, I haven't looked at the actual ICs yet. ST
>micro is the offender based on the data sheet. Their data sheet does not
>have the J high, K high entry in their truth table.
>
>At the time, I was building the module, I was using an ON Semiconductor
>data sheet that had the correct truth table. I went back and printed out
>the ST data sheet and noticed they had done some strange things with the
>truth table.
>
>I still have to verify that the parts in my stock are ST, but, I'm
>almost sure they are.
>
>Tim Daugard
>AG4GZ 30.4078N 86.6227W Alt: 3.7 M
>http://home.sprintmail.com/~daugard/synth.htm
>
>

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