24 May
2000
24 May
'00
4:42 p.m.
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. 
24 May
24 May
7:31 p.m.
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(a)world.std.com>
To: <classiccmp(a)classiccmp.org>
Sent: Wednesday, May 24, 2000 3:42 PM
Subject: Re: Altair parts substitutions
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.
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. Though intel did at times morph one part/process into
another.
Allison
8:56 p.m.
I wrote:
The 8205 and 3205 are exactly the same part.
Allison wrote:
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.
According to the 1980 Component Data Catalog, the specifications for
the 3205 (p. 2-22) and 8205 (p. 6-45) are identical. DC, AC, and all
the graphs.
8988
days inactive
8988
days old
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allisonp＠world.std.com -
elvey＠hal.com -
eric＠brouhaha.com -
richard＠idcomm.com