Seems like nonsensical part number disagreement between TI and Nexperia - Page 1
Forum section: electronics / projects

author: Konkedout
author_rank: Frequent Contributor
timestamp: September 19, 2024, 03:36:08 am
content: Just wondering why these two parts which seem to be functionally interchangeable; the Nexperia includes "1G" in the part number while the TI includes "2G"It would make sense that Nexperia's "1G" indicates one flip flop in the package. But apparently TI does not follow this part numbering logic. Does anyone know why this is?https://assets.nexperia.com/documents/data-sheet/74LVC1G74.pdfhttps://www.ti.com/lit/ds/symlink/sn74lvc2g74.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1726671117320&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fsn74lvc2g74I imagine that some component engineers might have a mental breakdown because of such nonsense....

author: squadchannel
author_rank: Frequent Contributor
timestamp: September 19, 2024, 03:56:21 am
content: Curiously, TI manufactures the SN74LVC1G74.https://www.ti.com/product/SN74LVC1G74https://e2e.ti.com/support/logic-group/logic/f/logic-forum/1128994/sn74lvc2g74-what-is-the-difference-between-sn74lvc2g74-and-sn74lvc1g74https://e2e.ti.com/support/logic-group/logic/f/logic-forum/607368/sn74lvc1g74-sn74lvc1g74-sn74lvc2g74A marketing problem?

author: Konkedout
author_rank: Frequent Contributor
timestamp: September 19, 2024, 04:03:21 am
content: Thanks! Well that shoots down one theory. After my post, I see that the Nexperia has schmitt triggers on all inputs, but the two different TI part numbers do not...So my initial statement that the two parts are functionally interchangeable is not quite true. I suppose maybe they are malfunctionally interchangeable?

author: exmadscientist
author_rank: Frequent Contributor
timestamp: September 19, 2024, 06:31:45 pm
content: The SN74LVC2G74 is just a historical mistake. An abominable mistake, to be sure, but a mistake. Please just ignore it,forget it ever existed, and all will be well.Use the mini-logic 1G74 if you need a single, or use the traditional 74LVC74A if you need a dual.(And the TI and NXP partsareinterchangeable for ordinary use, no matter what different words they like to use in their datasheets. Good luck exhibiting any meaningful difference between the manufacturers, though I suppose you could build a ring oscillator or something along those lines if you were dedicated to proving they aren'tcompletelyidentical. Which of course they aren't. They're justpracticallyidentical, and completely fungible.)

author: Konkedout
author_rank: Frequent Contributor
timestamp: November 04, 2024, 05:15:33 am
content: Thank you for that explanation. And....as atoken....I have a wide variety offungibleitems growing in our cool wet yard in Washington State right now...(I am half seriously playing stupid here. See:https://www.google.com/search?q=non+fungible+tokens&rlz=1C1RXMK_enUS1029US1029&oq=non+fu&gs_lcrp=EgZjaHJvbWUqCggDEAAYsQMYgAQyBggAEEUYOTIKCAEQABixAxiABDIHCAIQABiABDIKCAMQABixAxiABDIHCAQQABiABDIHCAUQABiABDIHCAYQABiABDIHCAcQABiABDIHCAgQABiABDIHCAkQABiABNIBCTYyMDZqMGoxNagCCLACAQ&sourceid=chrome&ie=UTF-8But I will not pretend that I fully understand this stuff. Give me transistors instead.)

author: Konkedout
author_rank: Frequent Contributor
timestamp: November 04, 2024, 05:26:15 am
content: But I can get hysterical about hysteresis (schmitt trigger inputs.)A few years ago, a board I had designed had a discrete sort of schmitt trigger (a debounce circuit) driving the clock input of a flip flop. A momentary push button was supposed to turn other circuit portions on and off. But the discrete debounce output had just a pullup resistor (not an active pullup) and the rise time was too slow. So in spite of my hysteresis the flip flop was mostly double flipping and not toggling as desired. Fortunately I was able to get that one working just by reducing the value of the pullup resistor. I doubt that my fix complied with the datasheet worst case requirements, but that board worked.Anyway that exercise increased my respect for the schmitt triggers which are available in some HCMOS gates and flip flops.