View source for 7400 Family Truth Tables

[[Category:7400]]
[[Category:TTL]]
[[Category:electronics]]
[[Category:reference]]

;Basic logic gates are fundamental building blocks of digital circuits, performing logical operations on binary inputs to produce a single binary output. 

;The seven basic logic gates are''':'''

===Logic Gates Truth Tables===
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<br style="clear:both;"/>
<div class="left-table">
  <h3>Buffer</h3>
  <table>
    <tr><th>Input</th>
        <th>Output</th></tr>
    <tr><td class="zero">0</td>
        <td class="zero">0</td></tr>
    <tr><td class="one">1</td>
        <td class="one">1</td></tr>
  </table>
</div>
<div class="right-table">
  <h3>NOT Gate</h3>
  <table>
    <tr>
      <th>Input</th>
      <th>Output</th>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="zero">0</td>
    </tr>
  </table>
</div>
<br style="clear:both;"/>
<div class="left-table">
  <h3>AND Gate</h3>
  <table>
    <tr>
      <th>A</th>
      <th>B</th>
      <th>Output</th>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="zero">0</td>
      <td class="zero">0</td>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="one">1</td>
      <td class="zero">0</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="zero">0</td>
      <td class="zero">0</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="one">1</td>
      <td class="one">1</td>
    </tr>
  </table>
</div>
<div class="right-table">
  <h3>NAND Gate</h3>
  <table>
    <tr>
      <th>A</th>
      <th>B</th>
      <th>Output</th>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="zero">0</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="one">1</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="zero">0</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="one">1</td>
      <td class="zero">0</td>
    </tr>
  </table>
</div>
<br style="clear:both;"/>
<div class="left-table">
  <h3>OR Gate</h3>
  <table>
    <tr>
      <th>A</th>
      <th>B</th>
      <th>Output</th>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="zero">0</td>
      <td class="zero">0</td>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="one">1</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="zero">0</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="one">1</td>
      <td class="one">1</td>
    </tr>
  </table>
</div>
<div class="right-table">
  <h3>NOR Gate</h3>
  <table>
    <tr>
      <th>A</th>
      <th>B</th>
      <th>Output</th>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="zero">0</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="one">1</td>
      <td class="zero">0</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="zero">0</td>
      <td class="zero">0</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="one">1</td>
      <td class="zero">0</td>
    </tr>
  </table>
<br style="clear:both;"/>
<div class="left-table">
  <h3>XOR Gate</h3>
  <table>
    <tr>
      <th>A</th>
      <th>B</th>
      <th>Output</th>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="zero">0</td>
      <td class="zero">0</td>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="one">1</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="zero">0</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="one">1</td>
      <td class="zero">0</td>
    </tr>
  </table>
</div>
<div class="right-table">
  <h3>XNOR Gate</h3>
  <table>
    <tr>
      <th>A</th>
      <th>B</th>
      <th>Output</th>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="zero">0</td>
      <td class="one">1</td>
    </tr>
    <tr>
      <td class="zero">0</td>
      <td class="one">1</td>
      <td class="zero">0</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="zero">0</td>
      <td class="zero">0</td>
    </tr>
    <tr>
      <td class="one">1</td>
      <td class="one">1</td>
      <td class="one">1</td>
    </tr>
  </table>
</div>
</html>

https://learnabout-electronics.org/Digital/images/basic-gate-ICs.gif
;<small>Image linked from [https://learnabout-electronics.org/<big>'''learnabout-electronics.org'''</big>]</small>

<br style="clear:both;"/>

== Tri-state outputs (for multiplexing outputs) ==
;<sub>Retrieved&nbsp;11:23, 26 February 2024 (UTC) from Perplexity.io</sub>
 In a 7400-series integrated circuit, the main difference between a tri-state output and a regular output lies in the ability of the tri-state output to assume three states: high (logic 1), low (logic 0), or a high-impedance state (open circuit). This allows the output to be effectively disconnected from the rest of the circuit when not actively driving a signal. Tri-state outputs require an additional "enable" input to control whether the output is active or in the high-impedance state, providing flexibility in signal routing and preventing short circuits when multiple devices are connected to the same output line[1][3]. Regular outputs, on the other hand, typically drive signals actively without the option to disconnect from the circuit.

The tri-state output's ability to enter a high-impedance state makes it particularly useful in scenarios where multiple devices share a common output line, allowing only one device to drive the signal at a time while others remain disconnected, thus preventing signal contention and ensuring proper communication within the circuit[3].

==Citations==
:[1] https://www.electronics-notes.com/articles/electronic_components/logic-ic-families-technologies/7400-series-ttl.php
:[2] https://youtube.com/watch?v=OgV4tDxk7sY
:[3] https://forum.digikey.com/t/tri-state-logic-input-outputs/25183
:[4] http://www.markbereit.com/rsrc/ccdig_74ls.html
:[5] https://en.wikipedia.org/wiki/7400-series_integrated_circuits