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data sheet for SSI-204 dtmf decoder

Discussion in 'Electronic Basics' started by Matt Warnock, Feb 26, 2004.

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  1. Matt Warnock

    Matt Warnock Guest

    i'm looking for the data sheet for the SSI-204 DTMF decoder. Their website
    has been down for a while. anyone have it?

    or as an alternative, does anyone know where to buy a replacement for this
    IC? you'd think DTMF decoders would be pretty common, but i can't find them

  2. Matt Warnock wrote...
    I'll send you a copy.

    - Win

  3. John Fields

    John Fields Guest

    Pin-for-pin replacement:

    Data sheet at:

    Available at:

    For a data sheet of a "pin-compatible" substitute (14 pin dip):
  4. John Fields

    John Fields Guest

  5. Matt Warnock

    Matt Warnock Guest

    thanks for all the replies. I wouldn't have asked unless 3 days of googling
    didn't come up empty.

    I'm reading the data sheet and there's a few things I'm not sure about.

    is the ENABLE for the outputs to turn them on whether it gets a tone or not,
    like a test, or does it have to be enabled to get any output, like an on/off

    what are the crystal oscillator inputs/outputs for? the block diagram shows
    it going to "clock circuits" but nothing internal. I don't think I need an

    lastly, are the parameters for "current supply" being 10-16mA. Does that
    mean that's the max output current of the D1-8 outputs? to test the
    circuit, I'd like to use LEDs on the outputs but I don't want to burn the
    outputs out so I'd like to know the max current out for the chip or each

    if you've used this chip before, I'd really appreciate any help!

  6. John Fields

    John Fields Guest

    It's to allow them to function. When ENB is low the outputs will be at
    a high impedance. (OFF)
    If you don't have a source of 3.58 MHz you'll need to connect a
    color-burst crystal in parallel with a 1 megohm resistor to Xin and
    Xout. If you do have a 3.58 MHz source, connect it to Xout and tie Xin
    to Vcc.
  7. Si Ballenger

    Si Ballenger Guest

  8. Chaos Master

    Chaos Master Guest

    I met Matt Warnock , in at the date of Thu, 26 Feb 2004
    19:47:30 -0500, when we had ideas of posting and reading in the article

    I've readed the datasheet for HT9170 (also a DTMF decoder so they should have
    some things in common) while trying to repair a caller ID device (almost nothing
    repairable. 95% done in 2 or 3 custom IC's) and it also needed a crystal. I
    think it's for the internal "switched capacitor" filters.

    For "current supply", methinks it means how many current is required from the
    power supply.

    by Chaos Master® - MSN:

    "A Elbereth Gilthoniel, silivren penna miriel o menel aglar elenath!
    Na-chaered palan-diriel o galadhremmin ennorath,
    Fanuilos, le linnathon nef aear, si nef aearon!" - The Lord of the Rings

    Linux User #327480 / GNU-Win32 / Cygwin / Win98 + LiteStep
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