16 Oct
2007
16 Oct
'07
9:48 a.m.
I've just encountered some datasheets for parts that I've never heard of
before -- 74ABTxxx parts. The lack of a "C" in there would seem to indicate
TTL of some sort but looking at the datasheet the power supply current would
seem to indicate CMOS of some sort, it's in the uA range.
Anybody ever encountered these before?
What can you tell me about them if so?
I note that packaging seems to be _only_ surface-mount styles.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
16 Oct
16 Oct
10:11 a.m.
I've just encountered some datasheets for parts
that I've never heard of
before -- 74ABTxxx parts. The lack of a "C" in there would seem to indicate
TTL of some sort but looking at the datasheet the power supply current would
seem to indicate CMOS of some sort, it's in the uA range.
BiCMOS - a hybrid technology of CMOS and bipolar.
Anybody ever encountered these before?
Another TI bit of weirdness, but they actually sold this successfully.
What can you tell me about them if so?
I note that packaging seems to be _only_ surface-mount styles.
I am pretty sure I have seen it in DIP (I may have some), but DIPs
started to die just when BiCMOS was coming out.
--
Will
10:21 a.m.
I've just encountered some datasheets for parts
that I've never heard
of before -- 74ABTxxx parts. The lack of a "C" in there would seem
to indicate TTL of some sort but looking at the datasheet the power
supply current would seem to indicate CMOS of some sort, it's in the
uA range.
Anybody ever encountered these before?
I note that packaging seems to be _only_ surface-mount
styles.
I think I have some, though I'll have to check when I get home - but
what I have is definitely DIPs, not SMT. If I'm right, ie, if what I
have really is 74ABTxxx, then they're CMOS chips with TTL-compatible
interfaces, ie, you can connect them directly to real 74xxx TTL logic.
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17 Oct
17 Oct
3:24 p.m.
On Tuesday 16 October 2007 13:21, der Mouse wrote:
I just wondered because I'm running into more and more variations on the 74xx
numbers, ones that don't make a whole lot of sense, while adding some
datasheets to the parts pages. And I'm beginning to get the feeling that I'm
reaching the point of diminishing returns with that stuff, that it might not
be worth my while to bother with it.
In addition to those, I ran across 74ASTxxx, 74ACQ (and 74ACTQ, which I'm
guessing is the standard "works with TTL thresholds" variant), 74ALV, 74ALVC,
74ALVCF, 74ALVCH, 74FR, 74LCX, 74LVTH, 74OL, 74VCX, 74VCH (and 74VHCT), and
74VHCU.
And this was all from only one mfr.! (Fairchild, in case anyone's curious.)
The "LV" stuff seems to mean "Low Voltage", and the "Q"
means Quiet (in terms
of glitching or power supply noise or something), I'm not sure about the
rest of it.
I noted that I'd skipped those, and did not bother putting them into the
table with the rest, for now. Somehow I doubt that I'm likely to run into
most of those anyhow...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
I've just
encountered some datasheets for parts that I've never heard
of before -- 74ABTxxx parts. The lack of a "C" in there would seem
to indicate TTL of some sort but looking at the datasheet the power
supply current would seem to indicate CMOS of some sort, it's in the
uA range.
Anybody ever encountered these before?
I note that packaging seems to be _only_ surface-mount styles.
I think I have some, though I'll have to check when I get home - but
what I have is definitely DIPs, not SMT. If I'm right, ie, if what I
have really is 74ABTxxx, then they're CMOS chips with TTL-compatible
interfaces, ie, you can connect them directly to real 74xxx TTL logic. 
3:43 p.m.
Roy J. Tellason wrote:
I noted that I'd skipped those, and did not
bother putting them into the
table with the rest, for now. Somehow I doubt that I'm likely to run into
most of those anyhow...
I got the fealing all this bunch of TTL is bus & bus
interface.
Since everything in now custom chips, you don't need bus drivers any more.
Ben.
6:54 p.m.
On Wednesday 17 October 2007 18:43, woodelf wrote:
Roy J. Tellason wrote:
Well, the idea of the parts pages wasn't so much to be used for newer design
but more as a reference to be able to understand what you might be dealing
with in terms of all sorts of older hardware. I started it as a way to
organize my datasheets, and it grew from there. And apparently a lot of
folks are interested in the older numbers, from what I can see, and also
the tube stuff...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
I noted that I'd skipped those, and did not
bother putting them into the
table with the rest, for now. Somehow I doubt that I'm likely to run
into most of those anyhow...
I got the fealing all this bunch of TTL is bus & bus interface.
Since everything in now custom chips, you don't need bus drivers any more.
Ben. 
16 Oct
16 Oct
10:24 a.m.
On 16 Oct 2007 at 12:48, Roy J. Tellason wrote:
I've just encountered some datasheets for parts
that I've never heard of
before -- 74ABTxxx parts. The lack of a "C" in there would seem to indicate
TTL of some sort but looking at the datasheet the power supply current would
seem to indicate CMOS of some sort, it's in the uA range.
Anybody ever encountered these before?
Advanced BiCMOS Technology, mostly used for driver applications.
3nsec gates with 32ma drive and will operate at both TTL or CMOS
logic levels.
Another member of the 74-alphabet soup series. See:
http://www.interfacebus.com/logic_table.html
for more letters.
Cheers,
Chuck
17 Oct
17 Oct
5:36 p.m.
On Tuesday 16 October 2007 13:24, Chuck Guzis wrote:
Another member of the 74-alphabet soup series. See:
http://www.interfacebus.com/logic_table.html
for more letters.
Thanks for the link, lots of good info there...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
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