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(Created page with "Category:TTL Category:7400 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: AND Gate: Outputs true (1) only when all inputs are true. Symbol: AND Gate Symbol Truth Table: A B A AND B 0 0 0 0 1 0 1 0 0 1 1 1 ===OR Gate=== Outputs true (1) if at least one input is true. Symbol: OR Gate Symbol Truth Tabl...")
 
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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:
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:
AND Gate: Outputs true (1) only when all inputs are true.
AND Gate: Outputs true (1) only when all inputs are true.
Symbol: AND Gate Symbol
Truth Table:
A B A AND B
0 0 0
0 1 0
1 0 0
1 1 1


===OR Gate===
  Outputs true (1) if at least one input is true.
  Outputs true (1) if at least one input is true.
Symbol: OR Gate Symbol
Truth Table:
A B A OR B
0 0 0
0 1 1
1 0 1
1 1 1
== 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


==Logic Gates Truth Tables==
<html>
<html>
<title>Logic Gates Truth Tables</title>
<style>
<style>
   table {
   table {
Line 52: Line 23:
   }
   }
   th {
   th {
     background-color: #aaa;
     background-color: #f2f2f2;
   }
   }
   .and-table {
   .left-table {
     float: left;
     float: left;
     margin-right: 20px;
     margin-right: 20px;
   }
   }
   .nand-table {
   .right-table {
     float: left;
     float: left;
  }
  .zero {
    background-color: lime;
  }
  .one {
    background-color: orange;
   }
   }
</style>
</style>
</head>
<body>


<div class="and-table">
<div class="left-table">
   <h2>AND Gate Truth Table</h2>
   <h3>AND Gate</h3>
   <table>
   <table>
     <tr>
     <tr>
Line 74: Line 49:
     </tr>
     </tr>
     <tr>
     <tr>
       <td>0</td>
       <td class="zero">0</td>
       <td>0</td>
       <td class="zero">0</td>
       <td>0</td>
       <td class="zero">0</td>
     </tr>
     </tr>
     <tr>
     <tr>
       <td>0</td>
       <td class="zero">0</td>
       <td>1</td>
       <td class="one">1</td>
       <td>0</td>
       <td class="zero">0</td>
     </tr>
     </tr>
     <tr>
     <tr>
       <td>1</td>
       <td class="one">1</td>
       <td>0</td>
       <td class="zero">0</td>
       <td>0</td>
       <td class="zero">0</td>
     </tr>
     </tr>
     <tr>
     <tr>
       <td>1</td>
       <td class="one">1</td>
       <td>1</td>
       <td class="one">1</td>
       <td>1</td>
       <td class="one">1</td>
     </tr>
     </tr>
   </table>
   </table>
</div>
</div>


<div class="nand-table">
<div class="right-table">
   <h2>NAND Gate Truth Table</h2>
   <h3>NAND Gate</h3>
   <table>
   <table>
     <tr>
     <tr>
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     </tr>
     </tr>
     <tr>
     <tr>
       <td>0</td>
       <td class="zero">0</td>
       <td>0</td>
       <td class="zero">0</td>
       <td>1</td>
       <td class="one">1</td>
     </tr>
     </tr>
     <tr>
     <tr>
       <td>0</td>
       <td class="zero">0</td>
       <td>1</td>
       <td class="one">1</td>
       <td>1</td>
       <td class="one">1</td>
     </tr>
     </tr>
     <tr>
     <tr>
       <td>1</td>
       <td class="one">1</td>
       <td>0</td>
       <td class="zero">0</td>
       <td>1</td>
       <td class="one">1</td>
     </tr>
     </tr>
     <tr>
     <tr>
       <td>1</td>
       <td class="one">1</td>
       <td>1</td>
       <td class="one">1</td>
       <td>0</td>
       <td class="zero">0</td>
     </tr>
     </tr>
   </table>
   </table>
</div>
</div>
<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>
<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>
</div>
</html>
</html>
<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

Revision as of 12:07, 26 February 2024



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: AND Gate: Outputs true (1) only when all inputs are true. 

Outputs true (1) if at least one input is true.

Logic Gates Truth Tables

AND Gate

A B Output
0 0 0
0 1 0
1 0 0
1 1 1

NAND Gate

A B Output
0 0 1
0 1 1
1 0 1
1 1 0


XOR Gate

A B Output
0 0 0
0 1 1
1 0 1
1 1 0

XNOR Gate

A B Output
0 0 1
0 1 0
1 0 0
1 1 1


OR Gate

A B Output
0 0 0
0 1 1
1 0 1
1 1 1

NOR Gate

A B Output
0 0 1
0 1 0
1 0 0
1 1 0


Tri-state outputs (for multiplexing outputs)

Retrieved 11:23, 26 February 2024 (UTC) from Perplexity.io
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
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