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Linux changed this of course. I encountered stuff like this inside a 70’s era Control Data disk drive. Power dissipation, if you have a lot of them. If the signal takes too long the circuit may start to behave badly at first at higher temperatures etc. Xenix was 74lx01 expensive though.

This thing had a 60 MB removable pack about 12″ in dia and 6″ thick. When connecting the input to a neighboring pin, you’ll have to consider the load on the given signal. Suppose you would like to build a Unix computer. Probably not that fast any more.

It’s only relevant when for example battery life datashedt optimal or signal speed is crucial. The entire unit was about the size of a modern office photocopier, and weighed more. Faster gates will see noise glitches on their inputs that slower gates miss. It means transmission in this case and the propagation time or propagation delay is the time in which a signal travels through a gate.



They even had to lower the power voltages to keep the heat production down. Back in the 70’s, you had and 74S Faster gates make faster output edges. Some are OK with that, others aren’t. They would have been more expensive, but if that is no problem I don’t see a reason not datashet use them as drop-in replacements.

74LS01 Quad 2-in NAND Gate Low power Schottky IC | Jaycar Electronics New Zealand

Bipolar is generally very fast. The is a traditional processor which can’t add wait states in his read and writes, so the time from address available to data read is fixed and limited. MS Windows also became more and more a serious platform. But when you come down to using them in your circuits, you also need to think about things like: What to use in the daily practice?

Does fatasheet technology draw more current with a low or high input? This would have to involve a simple MMU Memory Management Unit which dynamically translates the upper 4 address lines of the 16 logical address to say 8 7l4s01 lines to form a 20 bit physical address.

74LS01 Quad 2-in NAND Gate Low power Schottky IC

Also the 74ls04 that was often used in an oscillator circuit couldn’t be replaced by the 74HCT04, but they produce a special version, the 74HCU04 that can be used in this special way. You can get both. All other types of 74 chips were faster or used less energy or whatever.


By the way, we have built such a Unix computer around and used a couple of them for many years since then, both for database, accounting and embedded software writing. This made them actually short the 5V to the 0V for a very short time.

It might however increase the power usage during the moment of switching when the two gates should have significantly different switching times, but that is of course very unlikely. I have written a page about it: If you use a 3. It means Emittor Coupled Logic and it is extensively used in high speed digital data handling systems. I think that it isn’t much used nowadays. Can anyone point me to a reference that tells me the difference between all the 74xx series logic families?