13 Apr
2013
13 Apr
'13
10:15 a.m.
On 4/12/2013 5:22 AM, Shoppa, Tim wrote:
At the flip chip level it would include definitions
for DEC3639B (aka 2N3639), D662 (aka 1N645) and D664 (aka 1N3606). Pretty standard stuff
to read the datasheets and make SPICE models.
A real design (or redesign) would pay extensive attention to margining just like the
original designers did. SPICE can help verify to an extent, but all the details you
actually need for design of RTL/DTL/flip-flop are in the 60's TI transistor design
books.
Last night I tinkered with what was posted and I threw in some garbage
(actually for the diodes, I put in 1N4004 and for the transistor, a
2N918) just to get spice to shut up and it proved I had the right sort
of syntax to satisfy the basic parser.
Thanks to Tim, I'll find better models now that I know what I'm looking for.
This is just an exercise to bring up a corner of what is out there I've
not touched to see how it works. This is a fairly simple circuit, so
should be possible to spot garbage in - garbage out symptoms warned of
by Alison.
thanks
Jim