Connect with us

Pin out SN29730N

Discussion in 'Electronic Repair' started by J M Goodey, Nov 12, 2003.

  1. J M Goodey

    J M Goodey Guest

    Can anybody please help?
    Pin out needed for Texus SN28730N
    Not found on Texus site.
    Believed to be SN74221N but with pinouts in a different order.
    TIA for you help
     
  2. Tom Wright

    Tom Wright Guest

    Is it used in a TV?

    Can anybody please help?
    Pin out needed for Texus SN28730N
    Not found on Texus site.
    Believed to be SN74221N but with pinouts in a different order.
    TIA for you help
     
  3. J M Goodey

    J M Goodey Guest

    The message <3fb4aba7$>
    No its the mater Oscillator on an old Farfisa Electronic Organ
    It is a dual multi vib.
    Same as a SN74221 but with pins in a different order.
    Google comes up with nothing helpful.
     
  4. Uns Lider

    Uns Lider Guest

    It should be possible to work it out.

    SN74221 is 16 pins; is SN29730N also 16 pins?

    You can come up with candidates for GND and Vcc by checking which pins are
    hooked to the power plane.

    Each of the two halves has a true and a complement output. With the circuit
    operating you should be able to see these on a scope.

    The data sheet shows an external resistor from Vcc to each Rext/Cext, and a
    capacitor from each Rext/Cext to Cext.

    The A inputs will be either wired to the controlling circuit or tied to
    ground. The B inputs will either be wired to the controlling circuit or
    tied to Vcc. Uh, unless half the chip is unused, in which case 2A will be
    tied to Vcc and/or 2B will be tied to ground.

    If the CLR inputs are unused they will be tied to Vcc.

    If only a true or complement output is used, then the other one will be a
    no-connect.

    Let us know what you find out.

    -- uns
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-