Re: need small PAL with SR latch


"Joerg" <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:cyeve.33892$J12.6234@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hello Colin,
>
> > all i need is 1 nor, 1 nand, 1 sr latch, 2 xor, and a 1 bit tri state
> > buffer, I could probably do it with a very fast LUT too but im not sure
if u
> > can feedback data lines to address lines reliably unless its clocked,
> > otherwise thats a few diferent packages even if i try and convert some
of
> > the gates etc.
> >
> > A gal16v8z doesnt seem to consume much power unless they are hiding it
well
> > in the data ***, oh wait thats in standby, at 10mhz its 55ma but im
not
> > pumping the clock line so maybe itl be a lot lower.
>
> Look at "Normalized Icc versus Freq" in the lattice data *** on page
> 19. It doesn't exactly appear to be a static CMOS behavior, there is a
> pretty stiff pedestal at 0MHz.
>
> What really irks me and is acutally often the main reason why I do not
> use GALs in my designs is the cost. Your 16V8Z, for example, gobbles a
> whopping three to four (!) Dollars per chip. No thanks. I can do that
> with logic for 50 Cents or so and chances are pretty good that my
> clients can buy exactly those same logic chips 15 years from now without
> any problems. From half a dozen sources.
>

yes there seems to be lots of difernt parts of the same sort, maybe they
would be cheaper otherwise, or if you didnt keep designing them out HA ! the
cheapest I found was 70p @ qty 100

Maybe it has an internal clock running for some reason ? bias generator
perhaps ?

I wonder if the lattice software predicts supply curent im just tryin to get
to grips with that softwar enow.

Colin =^.^=


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