[time-nuts] homebrew counter new board test result

Li Ang lllaaa at gmail.com
Wed Feb 25 06:40:30 EST 2015


Hi Attila
  Thanks for the history about 74 series.
  BTW, The result.gif is a TDEV chart. I only know that different K means
different kinds of noise. I don't know what it means if the turnning corner
comes earlier or latter.

Hi Charles
 Thanks for the circuit. I have some LT1016 in hand, I will evaluate with
it.



2015-02-25 0:02 GMT+08:00 Attila Kinali <attila at kinali.ch>:

> On Tue, 24 Feb 2015 14:43:10 +0800
> Li Ang <lllaaa at gmail.com> wrote:
>
> >     I saw people talking about using 74AC to square the signal, what's
> the
> > difference between 74LVC and 74AC? 74AC is not easy to get.
>
> These are different families of chip production. You can see the 74HCxx as
> the grandfather, 74ACxx as the father and the 74LVCxx as the son.
>
> IIRC the AC (Advanced CMOS) was introduced in the 80s. The process
> which they were produced got superseeded and also the voltage levels
> went down. The LVC (Low Voltage CMOS) and LVX families are the current
> choice for logic gates. The main difference is that the node size (those nm
> measures people boast with, when they talk about chips these days) went
> down and with that the threshold voltage of the FETs and the maximum
> voltage the chips can withstand. Of course there are differences in the
> timing specs as well.
>
> TI's Logic Guide[1] and their Logic Migration Guide[2] contain
> additional information.
>
>
>                                 Attila Kinali
>
>
> [1] http://www.ti.com/lit/sg/sdyu001aa/sdyu001aa.pdf
> [2] http://www.ti.com/lit/ml/scyb032/scyb032.pdf
>
> --
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