TTL equivalent

Discussion in 'General Electronics Chat' started by sparky3489, Sep 21, 2009.

  1. sparky3489

    Thread Starter Member

    Sep 21, 2009
    12
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    Anybody know if a TTL equivalent exists for this CMOS device and if the ones I have found will work in the schematic?

    Other suggestions welcome.

    CD4063 = 74HCT85
    CD4040 = 74HC4040
    CD4001 = 74HC02
    CD4069 = 74HC04
    CD40110 = ?

    [​IMG]
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. Audioguru

    New Member

    Dec 20, 2007
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    74HCxxxx is not TTL. It is high speed Cmos that needs a 2V to 5V supply.
    I think the 74HC04 will melt in the CD4069 oscillator circuit.
     
  4. jgessling

    Active Member

    Jul 31, 2009
    74
    14
    For the CD40110 you may have to use two ttl chips. One 74LS90 for the counter outputting BCD to a 74LS47 to drive the displays. I'm just figuring out a similar thing so take this with a grain of salt. You can see how little the 74LS90 does so I suppose it made sense to combine the two functions into one chip.

    Regards, Jim
     
  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    A 74190 will do up and down counting, as a 7490 can only count up.
    You will also need a latch like a 7477.
    Then you will need a decoder for the display.
    The type depends on the type of display used.

    Greetings,
    Bertus
     
  6. sparky3489

    Thread Starter Member

    Sep 21, 2009
    12
    0
    WOW! Awesome responses.

    I found that to be the case as well. Thanks for the links.

    I was afraid of that.


    It looks as though I may stick with the original design or go single chip with an AVR.

    Thanks everyone.

    P.S. This is the concept - http://carstereoforum.net/showthread.php?t=1229

    The 8-bit to 7-segment was just a "bells and whislte" kind of thing.
     
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