Octal inverter

Discussion in 'The Projects Forum' started by markmc001, Jun 2, 2008.

  1. markmc001

    Thread Starter Member

    Mar 10, 2008
    12
    0
    I am putting together a pcb for an octal inverter (MM74HC240) to replace a hex inverter circuit in a system. The hex inverter IC simply has 6-inputs, 6-outputs, a 5V and a ground. The octal inverter has the 8 normal inputs and outputs and the supply but there are two other pins that connect to the inputs/outputs. What do these do?

    Thanks in advance,
    MM
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
    Hello,

    These extra pins are enable pins.
    With these pins you can make the outputs high-Z.
    See extract from datasheet.

    Greetings,
    Bertus
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Before you use a component you should read its datasheet carefully before use it. The datasheet contains information about the pin configuration, the electrical ratings of the component as not to burn it out etc.
     
  4. markmc001

    Thread Starter Member

    Mar 10, 2008
    12
    0
    Many thanks!
     
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