TTL equivalent

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

  1. sparky3489

    sparky3489 Thread Starter Member

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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]
     
    #1
  2. bertus

    bertus Administrator

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    #2
  3. Audioguru

    Audioguru New Member

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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.
     
    #3
  4. jgessling

    jgessling Active Member

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    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
     
    #4
  5. bertus

    bertus Administrator

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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
     
    #5
  6. sparky3489

    sparky3489 Thread Starter Member

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    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.
     
    #6
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