How do I use 74LS138's to form a 1-of-16 decoder

Discussion in 'Homework Help' started by kieran, May 16, 2010.

  1. kieran

    Thread Starter New Member

    May 14, 2010
    Hey guys another question. How do i combine 74LS138's to make a 1-of-16 decoder. Is it as simple as connecting two of the three inputs from one 74138 to determine which of the decoder chips to enable (say A4 is the MSB with A3). These will connect to the seperate enable inputs (E1 and E2) with possibly an inveter on E2 to simulate a high when needed. E3 will be earthed i think???

    And then have all three other inputs to determine which output of the enabled chip is determined (A2, A1, A0).

    Will this work


  2. beenthere

    Retired Moderator

    Apr 20, 2004
    Probably will work. A schematic makes all clear.