Logic gates whats the basic ones that you need

Discussion in 'General Electronics Chat' started by roll cast, Aug 19, 2011.

  1. roll cast

    Thread Starter New Member

    Apr 3, 2011
    I was doing a bit of looking into logic gates and found out that all of the most common gates can be made from AND, NOT and OR gates however does this rule apply for every gate or only the most common simple gates?

  2. t06afre

    AAC Fanatic!

    May 11, 2009
    The AND, NOT, and OR gates are the building blocks. With these gates you can create any logic function. If we go back a (very) long long time. The cheapest logic block was the NAND gate. So it was actually cost effective to build logic using only NAND chips. But still to day it is a typical question in digital electronics exams. You are presented a boolean equation. And asked to draw the circuit using only NAND gates
    By the way. a very useful building block in digital electronics are the JK flop-flop. You should also get some of those.
  3. bertus


    Apr 5, 2008
  4. Jaguarjoe

    Active Member

    Apr 7, 2010
    You can make everything with nand gates.
  5. SgtWookie


    Jul 17, 2007
    You can also make any other logic gate with NOR gates.
    NAND: http://en.wikipedia.org/wiki/NAND_logic
    NOR: http://en.wikipedia.org/wiki/NOR_logic

    One of the most handy logic ICs to have around is the 4093 quad Schmitt-trigger NAND gate. Various manufacturers use different prefixes for the 4000-series CMOS logic ICs, like CD, HEF, MC1, etc. Very few of the 4000-series ICs have Schmitt-trigger inputs; the 40106 hex Schmitt-trigger inverter is the only other one I can think of offhand.

    74-series ICs are also handy, but their operating voltage range is more limited, and they are generally more power-hungry. If you are using battery power, you should consider the 4000-series.