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74ls14 instead of 74hc14 for data cable? Plz help!

Discussion in 'Electronic Basics' started by Mike, Jul 16, 2003.

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  1. Mike

    Mike Guest

    I'm not too good with electronic components. That is I don't
    understand much about them, but I can follow instructions well and I
    got excellent soldering skills ;). I'm trying to make a data cable
    for my cell phone but I have a slight problem that only you guys can
    help me with. The schematic calls for a 74hc14 IC, but all I can get
    my hands on locally is a 74ls14. I am unsure of the difference, so
    could someone tell me if they work the same and if there are any
    differences. Thanks.
     
  2. Yes, there are differences. The 'LS' parts are TTL and have different
    signal levels and power limits than the CMOS (HC, in this case)
    cousins. That said, it still might work (or need slight
    modifications). If you post a schematic perhaps we could tell if it
    would work.
     
  3. Guest

    Yeah, i had the same prob with an old smd LS244 octal, replaced it with a
    74HCT244 octal and now the bloody unit doesn't work whatsoever.....oh well,
    back to trying to find an original.....
    Gaz
     
  4. Rich Grise

    Rich Grise Guest

    Check your soldering. An HCT should be a drop-in replacement for an LS,
    unless your design actually _needs_ the slower chip, which doesn't make
    any sense in any reality I've ever visited.

    Thanks,
    Rich
     
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