8 Feb
2006
8 Feb
'06
9:13 a.m.
On 2/8/2006 at 8:31 AM vrs wrote:
Not being part of this discussion, I wondered why that approach hadn't been
considered, given the flexibility it affords. How fast do you need the
part to be? 20-25 nsec isn't considered to be "ultra fast" nowadays.
Cheers,
Chuck
I'm just
wondering about what happens when the current candidate for
substitution also becomes unavailable...
I do think I could make a Q-bus receiver from a linear IC, like an
"ultra-fast" comparator, pretty easily. 
8 Feb
8 Feb
10:13 a.m.
New subject: UNIBUS transceiver was RE: have an extra M105 + M7821 unibuscard?
I do think I
could make a Q-bus receiver from a linear IC, like an
"ultra-fast" comparator, pretty easily.
Not being part of this discussion, I wondered why that approach hadn't considered, given the flexibility it affords. How
fast do you need the
part to be? 20-25 nsec isn't considered to be "ultra fast" nowadays.
When I looked into it, I didn't find a very nice combination of price,
speed, and pin count. I think the ideal part would be a quad comparator,
with 10-20ns propagation delays, 200mV threshold, and rail-rail inputs.
If you know of inexpensive part like that, I could probably figure out
how to use it :-). (Someone with some expertise using linear chips
would be better suited to that task, though.)
Vince
"Ultra-fast" seemed to be the marketing term that was being used for
comparators that switched at these speeds, in the datasheets I was
reading.
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