The sheets I have on the 3205 and 8205 all agree it's a bipolar device.
With the 3205 I'd certainly belive it was intended to go with the rest of
that bipolar family, so it's probably schottky bipolar. I haven't been
downstairs in a couple of days, but I do have more specific data on the part
downstairs. I think it's quite safe to use an F138 or an ACT138 in its
place anywhere. It may change the races somewhat, but shouldn't hurt any
reasonably designed circuit. All bets are off with Altair logic designs,
though, since they often relied very much on having a capacitor soldered to
the back of the board for a delay element.
Dick
----- Original Message -----
From: allisonp <allisonp_at_world.std.com>
To: <classiccmp_at_classiccmp.org>
Sent: Wednesday, May 24, 2000 3:42 PM
Subject: Re: Altair parts substitutions
> >> I've just checked the schematics, and the chip I replaced (on the PROM
> >> memory board (which uses 1702s, of course)) was a 3205. Same pinout as
> >> the '138, etc.
> >> Any idea if that's a renumbered TI part?
> >
> >The 8205 and 3205 are exactly the same part.
>
>
> Not according to my intel books, similar but it's like saying a 74ls138 is
> the
> same as 74hct138... very close. Apparently there was a process
difference.
> Though intel did at times morph one part/process into another.
>
> Allison
>
>
Received on Wed May 24 2000 - 19:31:08 BST