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Old 19th May 2004, 09:24 PM   #1
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Default Which 74 family for >100MHz ?

Hi,

which cmos logic family is good for highest speed ?

Bernhard
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Old 19th May 2004, 09:29 PM   #2
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Some of us have learned the hard way is not AC/ACT.

Ever think of ECL???


Jocko
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Old 19th May 2004, 09:32 PM   #3
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Where is the limit for 74xx ?
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Old 19th May 2004, 09:37 PM   #4
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I'm sure that there are families that work that high. But after my experience with AC, I went back to ECL if it really was that fast.

Someone in Russia posted a chart of the intrinsic jitter of different families. May be in one of the I/V threads.

Sorry.....I can't help any more. I am old time ECL kind of guy. Took me a while to get comfortable with HC.

Jocko
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Old 19th May 2004, 09:55 PM   #5
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I agree with Jocko, if ECL is a possible choice, then have a look
at it. I stopped working with digital design shortly after AS and
ALS TTL appeared, ant they caused problems. Everybody is
telling me that the newer CMOS families cause a lot more problems.

But, of course, ECL is power-hungry and want some strange
supply voltages.
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