Can we use a tristate buffer in place of voltage level shifter?

Discussion in 'General Electronics Chat' started by sharath_412, May 25, 2007.

  1. sharath_412

    Thread Starter Active Member

    May 7, 2007
    32
    0
    Hi,
    We need voltage convertion from 5 volts to 3.3 volts( TTL compatible).
    For this can i use a tristate buffer ( supply =3.3V, input voltage range is -.5 to 5.5 volts, o/p is TTL compatible) in place of a level shifter( Vcc=3.3).


    Q1. In the datasheet of tristate buffer he specified currents for logic 1 and logic 0 as
    logic '1' output current -20 mA
    logic '0' output current +20 mA

    Is this same for all tristate buffers?
    When we connect some component at the o/p of that tristatebuffer what are the issues I have to take care about?


    thanks
    sharath
     
  2. cumesoftware

    Senior Member

    Apr 27, 2007
    1,330
    10
    Where is the datasheet? Are you refering to open collector outputs? You can use those for that.

    I sense a confusion between tristate gates and open collector outputs in this forum.:D
     
  3. lightingman

    Senior Member

    Apr 19, 2007
    374
    22
    There are a range of gates that will do this.... 74LCXxxx series.They will run at 3.3v VDD, but have 5v tolerant inputs.Or check out the CD40109.Daniel.
     
Loading...