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naming conventions

Discussion in 'Electronic Design' started by Info, Oct 20, 2003.

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  1. Info

    Info Guest

    hi all,
    there is anybody that can help me to find a pdf manual on naming
    conventions...
    example 74hct instead 74hc
    or 29c020 instead 29f040
    thanks
     
  2. Ken Taylor

    Ken Taylor Guest

    Google on a search term like '+7400 +logic +families'

    Ken
     
  3. Hi Info,
    74HCT00 and 74HC00 are different families.
    29C020 and 29F020 are also likely different families.
    Ask the respective manufacturers.

    Rene
     
  4. Info

    Info Guest

    thanks I've tried,
    I'm looking for an extended naming devices document because there is an
    international standard for builders,
    I've found something at http://www.philipslogic.com/products/naming/ but it
    isn't the international standard for naming (like ISO, etc).
    other ideas?
     
  5. If you want an EIA or ISO standards document, you have to pay for it.
    They aren't cheap.

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  6. -=Punkrat=-

    -=Punkrat=- Guest

    I don't believe that a standard exists for naming
    logic & memory. (suchas the JEDEC standard for discretes 1N 2N 3N
    and 4N type devices).

    In the case of logic nomenclature companies like TI National
    Fairchild Philips and others improved the basic 7400 series and
    included part number designators to
    define the improvements or the choices availables.

    7400 std TTL
    74S00 Schottky
    74LS00 low power Schottky
    74ALS00 Advanced low power Schottky
    74AS00 Advanced Schottky
    74AC00 Advanced CMOS
    74ACT00 Advanced CMOS TTL compatible
    74F00 Fast

    etc etc The commonalities in the part numbers among the main
    manufacturers are a sales technique to promote market share and
    increase new designs for the manufacturer.

    To the best of my knowledge a standards committe doesn't exist to
    define functionality and part numbering on either family. That's the
    choice of the manufacturer who invents it and the other manufacturers
    who cross license the production rights.

    PR
     
  7. Ben Bradley

    Ben Bradley Guest

    In
    alt.electronics,sci.electronics,sci.electronics.components,sci.electronics.design,
    There's no "international standard." When a manufacturer came out
    with a new family, the manufacturer gave it a new name, and often
    other manufacturers followed with their line of (semi)compatible parts
    with the same name. It's usually a mnemonic or abbreviation of the
    family name. HC is high-speed CMOS, HCT is high-speed CMOS with TTL
    I/O voltage levels.
    29c020 is surely a CMOS part, and ISTR 29f040 is a Flash part. But
    these two are not TTL or considered part of any 'ttl family' so any
    'rules' that might apply to 'TTL' type families may not apply here.
    Fairchild made 74Fxx where the F is for FAST, some acronym that starts
    with Fairchild, and that's a different use of F than in the 29F040.
    This was actually an improvement over previous numbering
    conventions. The original TTL series started at 7400, the original
    CMOS was the 4000 series, there were different ranges of numbers (I
    actually forget, which is probably a good thing) for RTL and ECL.
    Another possible websearch string might be history of ttl.
     
  8. 7400 Is the commercial temperature range. 5400 is the Military
    temperature range.
    I believe all the early 7400 chips were made by TI and were labeled
    SN7400, etc. In order to convince govermnents and companies to buy
    the chips, a company would have to allow another company to 'second
    source' the chips. So National had the DM7400, etc. Perhaps this is
    why the 7400 series and its later successors retained and modified
    this 'industry standard' naming convention. Sort of a consensus.

    --
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    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
     
  9. RTL was 9xx from what I can remember (and no doubt other numbers as well).
    And then there's early Motorola TTL, which was 3xxx and 4xxx numbers, just
    to keep us good and confused! :)

    And you're forgetting about DTL entirely!
     
  10. Motorola's RTL was their 7XX, 8XX, and 9XX series.
     
  11. Really? I never got a hold of any databooks where RTL was concerned (that
    was a much harder thing to do back then). Nor DTL, for that matter. Most
    of the RTL I ran across was construction articles in hobby-type magazines
    that put a "uL" prefix in front of such parts as the 914 -- which is
    Fairchild if I'm not mistaken. Also built a couple of kits that used those
    parts, though I can't recall what the company (in NYC) was that sold 'em.
    They're no doubt gone now, in any case...
     
  12. Rich Grise

    Rich Grise Guest

    I remember some Motorola chips that were either RTL or DTL;
    I can't remember which; and the numbers were like
    M?3??. They ran on 3.6V, I think. But this was a very,
    very long time ago. Seems like only a few years after
    they had announced the invention of the transistor.

    I also STR that RCA came out with some transistor arrays
    very early on, with numbers in the 30?? range, but don't
    know if anybody still makes the things.

    Cheers!
    Rich
     
  13. RTL databooks weren't hard to get. I got them when I was in high
    school. THe stuff was a PITA to use though.
    Well, 74LS, 74ALS, and all of that genra are really DTL. ;-)
    Yes, uL (logic) or uA (analog) would have been Fairchild.
    I worked for a small company called HAL Electronics (PO box in
    Champaign Illinois; Urbana's USPS office didn't have boxes up to 2001
    ;-). They made HAM equipment (automatic keyers, test equipment, and
    such) and used a lot of RTL logic.
    All but the (Schottky) DTL. ;-)
     
  14. Polypaks sold a lot of surplus and reject RTL and DTL chips in the
    '70s.

    Motorola had the:
    MC700 series, rated for +15 to + 55° C for consumer electronics.
    MC800 series, rated for 0 to + 75° C for industrial electronics.
    MC900 series, rated for -55 to + 125° C for military electronics.

    The 1970 Motorola Semiconductor Databook lists 26 different chips,
    with most available in all three familes.
     
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