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Looking for a TTL 74 Series Chip

Discussion in 'Electronic Components' started by Tim, Oct 14, 2010.

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  1. Tim

    Tim Guest

    The one I need would be similar to the 74148, but I need it to latch the
    3 bit output. I have tried Google, but it always ends up with the 74148,
    74238, 74348 or the 3 to 8 line instead.

    I am hoping someone remembers using these and could direct me to the
    proper part number.

    Thanks in advance,

    - Tim -
  2. Rich Webb

    Rich Webb Guest

    I don't but, if all else fails, you may consider implementing the
    function in a GAL or small CPLD. Or, just add some D flip-flops
    downstream of the encoder, suitably clocked?
  3. Guess you need a 74278 though I doubt it to be available anymore. FAIK there
    have not been LS or HCT versions either. As Rich mentioned already the
    function can be easily programmed in a GAL20V8 or similar. (At least I can
    do so.) Though unless you making a one of, you better consider another
    approach as the small GALs tend to become obsolete.

    petrus bitbyter
  4. Tim

    Tim Guest

    Thanks for the response, but I think I'll just add a latch to the 74148
    chip. That seems to be the easiest approach.

    - Tim -
  5. Tim

    Tim Guest

    I guess such a critter does not exist. I will be adding a latch to the
    74148 style chip to solve the issue.

    Thanks for responses.

    - Tim -
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