[sdiy] moog module designs

[Scott Gravenhorst]

How can that be?  If J=H and K=X (where K can be H) for output Q=H and then
J=X (where J can be H) and K=H for output Q=L, isn't that ambiguous?  That
is, two different outputs for the same input condition.

Am I confused?

James Patchell <patchell at cox.net> wrote:
>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
>***************************************************************
>http://www.oldcrows.net/~patchell
>
>***************************************************************
>
>

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