[sdiy] moog module designs

[James Patchell]

I took at look at the ST Microelectronics data sheet...and while the truth 
table is not done in a way I would have done it...it does fully specify the 
next state for all possible inputs...it is just not real clear when you 
look at it.  I have used the ST 4027's and they work fine...it looks like 
the same guy who did the truth table must have also written the GSM spec as 
well...


At 10:54 AM 4/23/2005 -0500, you 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

         -Jim
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