Re: How inaccurate is a 555 or 7555 REALLY?


John Fields wrote:
On Fri, 08 Dec 2006 16:37:46 -0600, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:


---
I don't know, but you seem to be trying to build up this big case
where it's evil _not_ to use PLDs. For me it's not a big deal since
I usually only have a little glue logic surrounding a
microcontroller and the expense and bother of the PLD isn't worth it
when I can use good ol' 74HC and 4000 parts from _anywhere_ to get
the job done. Cheap, too!
---

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Forgot to mention...

This is USENET, Bill, and if you think anyone's going to be
interested in learning PLD when what they really want is a one-off
they can wire up themselves and get working with the least amount of
hassle, then you're just fucking insane.

I know - anything you can't do by tacking diodes around a 555 is a
hassle.
Other people have learnt to master more than one or two devices.

Do keep in mind that the PLD handles all the logic - there isn't a lot
left to wire up after you have programmed the PLD, and that saves a
load of time, space, money and potential unreliability.

Also, I just went over to the Xilinx site and looked up prices on
their Cool-Runner stuff.

Pick me up off the floor, OK?

I'm laughing so hysterically it's all I can do to type this without
meaking missteaks!

Pity that you couldn't remember the prices that brought on this
hysteria.
I got 15 XCR3032XL-10PCG44C for $1.70 each in June 2006. That doesn't
strike me as expensive for use in a one-off. But then you do design and
price everything as if it was going to manufacturered in thousands -
one of those habits that "professional" designers develop and can't
seem to lose, if you really are an example of this interesting breed.

--
Bill Sloman, Nijmegen (but in Sydney at the moment).

.