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7400 Family Truth Tables: Difference between revisions

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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:
==Logic Gates Truth Tables==
==Logic Gates Truth Tables==
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<div class="left-table">
<div class="left-table">
   <h3>Inverter (NOT Gate)</h3>
   <h3>Buffer</h3>
   <table>
   <table>
     <tr>
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     <tr>
       <td class="zero">0</td>
       <td class="zero">0</td>
       <td class="one">1</td>
       <td class="zero">0</td>
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     </tr>
     <tr>
     <tr>
       <td class="one">1</td>
       <td class="one">1</td>
       <td class="zero">0</td>
       <td class="one">1</td>
     </tr>
     </tr>
   </table>
   </table>
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<div class="right-table">
   <h3>Buffer</h3>
   <h3>Inverter (NOT Gate)</h3>
   <table>
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       <td class="zero">0</td>
       <td class="zero">0</td>
       <td class="zero">0</td>
       <td class="one">1</td>
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       <td class="one">1</td>
       <td class="one">1</td>
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Revision as of 17:08, 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

Logic Gates Truth Tables

basic-gate-ICs.gif

Buffer

Input Output
0 0
1 1

Inverter (NOT Gate)

Input Output
0 1
1 0


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

Inverter (NOT Gate)

Input Output
0 1
1 0

Buffer

Input Output
0 0
1 1

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
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