We were doing some timing delay simulations using SPICE models from that
that cave in Texas. Our loading was around 15pF and the data
book numbers spec'd at 15pF were about 1.0-1.5ns greater than the what
SPICE told us. We went round and round trying to find out which one was
right, had we made the right assumptions in SPICE, were we using the data
book numbers correctly, and so on. We finally found a guy in the cave that
told us the truth. His words to us: " Believe the SPICE results before you
believe what's on the data sheet, its all specsmanship. But don't expect
to see the data book numbers changed anytime soon."
David Haedge
Raytheon
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