6 Jan
2012
6 Jan
'12
12:27 a.m.
On 5 Jan 2012 at 20:06, Tony Duell wrote:
I remmeebr a conversation I had some yeas ago THegroup
was deisnging a
device which involved some high-speed analiguye and ECL circuity and
thus had ot go on a 16 layer, arefull-made (read : mega-expensive)
PCB. There was one bit of the desing that handn't been completed, It
came down to producing a logic signal from 3 other logic signals (I
think all F TTL). Thing is, they wanteto get the PCB off to the
manufcaturer ASAP, without finising that part of the desigbn.
Your description's a little vague, but I suspect something like a
74156 with a pullup on the (combined) outputs. If that's not right,
a better explanation of the problem might help.
--Chuck