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You can’t use the 74HCT04 as an oscillator with a crystalas was often done.

Can anyone point me to a reference that tells me the difference between all the 74xx series logic families? This thing had a 60 MB removable pack about 12″ in dia and 6″ thick.

What to use in the daily practice? Just some components in the timing’s most critical path will need to be done in faster technology. Maybe you were just getting 74LS It gives a guite good overview of these logic-IC families, with properties, differences, etc Depends on your circuits.


This means it is guaranteed over a larger temperature range and is more expensive. You can get both. Motherboards were getting cheaper and cheaper. This was the original series. 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 address lines to form a 20 bit physical address. Input currentin both high and low states.

74 Series IC Data Sheet Index

Open inputs At If you use a 3. You probably also know that IBM had a couple of water cooled mainframe computers in a period that their processors couldn’t be cooled well enough with air. 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. It will double the load on the input signal, but will also double the drive of the output signal.


Back in the 70’s, you had and 74S All other types of 74 chips were faster or used less energy or whatever. Can you tell me the meaning of the term z-state High impedance for a digital circuit and how do all the logic families implement this?

PG1N’s HAM Radio Site – IC 74LSXX-Serie – 74LS01

But all this is in most cases not very important. They were already obsolete in the late 70’s when I started tinkering with this stuff. But civilians may also buy it What the optimal solution is depends on all kinds darasheet factors: You should never leave an input open, because the circuit can dayasheet to oscillate, which costs a lot of energy and can disturb the working of the rest of the circuit.

Cray’s were made with it. Example Since a lot of people seem to have trouble choosing, here a more practical example. Power dissipation, if you have a lot of them. In my opinion, the major differences from the user’s perspective, are speed, and input thresholds.


I have written a page about it: This will give a clear indication of how reliable it is. With the arrival of the there was absolutely no incentive to build our own computers anymore. In earlier days, chips needed all kinds of weird voltages. Only one of those is normally conducting electrical current at a certain moment pulling the output pin either to the 0V or the 5V. It means Emittor Coupled Logic and it is extensively used in high speed digital data handling systems.

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If the signal takes too long the circuit may start to behave badly at first at higher temperatures etc. It was safer to moisten your finger first so the temperature would stay below degrees C.

Faster gates will see noise glitches on their inputs that slower gates miss. GaAs was also considered or even used for very fast chips. What may be an acceptable substitute in one case, may be a flop in another.

It’s only relevant when for example battery life must optimal or signal speed is crucial. It might however increase the power usage during the moment of switching when the two gates should have significantly different switching datasheeh, but that is of course very unlikely. It’s not easy to determine what the optimal solution is.

In serious PCB-designs you need to calculate how long it takes for signals to go from serious chip A to serious chip B through all the intermediate TTL-chips. First you try to calculate everything exactly and then at an extra proof you can put the finished product in an oven and heat it up to check if it still works.

Is it suitable for driving long bus wires, or will pulsewidths suffer? Uses lots of current to achieve high speed. 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 dtasheet embedded software writing. Probably for portable applications.