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Help me choose between two different XOR units.

Discussion in 'Electronic Design' started by Mr. J D, Aug 31, 2006.

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  1. Mr. J D

    Mr. J D Guest

    I will be controlling the inputs of these XORs directly from a PIC
    output, both PIC and Logic powerd from the same regulated +5V. I have
    two choices:

    ST's Single XOR 74V1G86STR in a SOT23-5L
    http://www.st.com/stonline/books/pdf/docs/5735.pdf

    OR

    Fairchilds Tinylogic UHS Single XOR NC7SZ86M5X in a SOT23-5L
    http://www.fairchildsemi.com/ds/NC/NC7SZ86.pdf

    They are both astonishingly similar:
    both have a VIH minimum of .7 @ 5V
    both have a VIL maximum of .3 @ 5V

    The Tinylogic can provide up to -+ 24mA at output
    The ST can provide a minimum of 8 mA at output

    The XOR's output is directly connected to the two Reset pins on a 556.
    Hence when the XOR goes high, the 556 begins oscillating. When the XOR
    output goes low, the 556 goes back down to outputting 0V.
     
  2. Luhan

    Luhan Guest

    Answer #1: either XOR will work.

    Answer #2: why dont you just do the xor in the software?

    Luhan
     
  3. John Fields

    John Fields Guest

     
  4. Mr. J D

    Mr. J D Guest

    PIC is pre-programmed, I do not have acess to PIC programming hardware.
     
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