Re: switching FETs or relays

bill.sloman@xxxxxxxx bill.sloman@xxxxxxxx posted to
sci.electronics.design:

On Sep 3, 11:55 am, Jamie
<jamie_ka1lpa_not_valid_after_ka1l...@xxxxxxxxxxx> wrote:
Eeyore wrote:

Jamie wrote:

Eeyore wrote:

Jamie wrote:

<snip>

#4
Last time I went to school for this (years ago, experienced
followed) logic was +2.5 and up for ON State, -2.5 and down for
Off state. Anything between that was undefined. in the case of TTL
, +2.5 and up was on, anything below was off.

Maybe things have changed ?

No, nothing has changed. TTL was always driven between a +5V rail
and a 0V rail. A low output was always between 0V and 0.4V, and a
high output between 2.4V and 5V.

Check any data ***.

focus.ti.com/lit/ds/symlink/sn7400.pdf

I can't imagine who might have taught you +/-2.5V - do let us know
the name of the school that you think taught you that. You may be
able to sue them for fraud, but if you are sufficiently out of touch
with reality not to have learned better, I can't hold out much
hope..

--
Bill Sloman, Nijmegen

The levels are actually credible, for pre-TTL/DTL/RTL circuitry. I
have actually worked on computers that used very different logic
levels; some nearly like these. Just the same those levels are
something like i would expect of a vacuum tube computer.

.

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