🚀 go-pugleaf

In article <3958@shlump.nac.dec.com>, landry@enginr.dec.com writes:
> 	     cap value(uf)	total voltage drop (mv) 
> 
> 		0.068			130
> 		0.1			115
> 		0.22			95
> 		0.33			85
> 		0.47			80

Consider that the threshold voltages for TTL levels are 0.8 and 2.4,
and closer to the rails for cmos -- then the difference between
0.115 and 0.085 (.03 volts) doesn't seem so bad.  I agree that the
noise margins are better for .33, but are they better enough?

As an aside, one our technology guys was telling me that bypass caps
of any size or type are virtually useless for eliminating the noise
components above about 300mhz.  Fortunately most logic is more prone to
lower frequency (lower than 300mhz!) glitches than to higher frequency
glitches -- after all, if it could respond that fast, people would use
it in their Cray's instead of their ST's.

-- 
- John M. Logajan @ Network Systems; 7600 Boone Ave; Brooklyn Park, MN 55428  -
- logajan@ns.network.com / ...rutgers!umn-cs!ns!logajan / john@logajan.mn.org -