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Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Author Topic: Substituting LS for 74 series? Read times. In an existing antique circuit using one-shot, if the only repair part I can get locally is an 'LS, any reason to not use this as a substitute for the ?
Most of the time this will work. I don't recall all the specifics but LS is "Low power Schottky", it seems to be the most common of all the 74xx series. Art of Electronics, 3rd ed. Unfortunately they don't discuss the ', or the series ' The related information may be useful, at least. Offhand, I might be concerned that the version can handle larger capacitances for the same discharge delay time.
Which might need a smaller C and larger R to keep the same time. They were never particularly accurate anyway, and different brands have different timing and stability Bringing a project to life? Send me a message! Except for output drive current differences, low power schottky TTL can almost always replace standard TTL and I think that is the case here.
Update: I just noticed that the National 74LS datasheet I found is mislabeled and is actually for the National so of course it is identical to the TI I have found no 74LS datasheets. TI made a 74L which has about half of the drive capability but of course it draws about half of the power and is half of the maximum speed but otherwise looks like a direct replacement.
Why not use the real deal? That totally depends on what it is driving, fan-out on outputs, etc. The data sheets tell you all of this. You need to look at the circuit to see what it is driving on each output and see if the LS has enough oomph.
If not, you could change some of the chips it is driving to LS also but then you need to check everything else downstream of those, etc Digikey stocks them. I have several s in my logic chip drawer but no 74LSs and it I don't see a data sheet for an LS anywhere in any of my data books or anywhere online. Are you sure the local one you have available is really LS? Zero Super Contributor Posts: Country: Quote from: rstofer on January 30, , pm. Quote from: Hero on January 30, , pm. Quote from: drussell on January 30, , pm.
Quote from: drussell on January 31, , am. The remarkable thing is how many of the 74 series ICs are still manufactured. I suppose it's inevitable that most of them will go away at some point, but you can still buy brand new parts for many of them, in DIP packages no less. I doubt there are many new products made that use them anymore. There was an error while thanking. SMF 2. EEVblog on Youtube.
74HC121 DATASHEET PDF
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