{"id":10794,"date":"2024-05-25T18:40:16","date_gmt":"2024-05-25T18:40:16","guid":{"rendered":"https:\/\/www.fambach.net\/?p=10794"},"modified":"2024-06-01T19:58:40","modified_gmt":"2024-06-01T19:58:40","slug":"ttl7400","status":"publish","type":"post","link":"https:\/\/www.fambach.net\/en\/ttl7400\/","title":{"rendered":"TTL IC 7400"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Contents\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Fakten\" title=\"Facts\">Facts<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Schaltzeichen_fur_NAND\" title=\"NAND symbol\">NAND symbol<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Schaltplan\" title=\"Schematic\">Schematic<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Wahrheitstabelle\" title=\"Truth table\">Truth table<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Logiktester\" title=\"Logic tester\">Logic tester<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Datenblatt\" title=\"Data sheet\">Data sheet<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Anwendungsbereiche\" title=\"Areas of application\">Areas of application<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Ansichten\" title=\"Views\">Views<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Schaltung\" title=\"Circuit\">Circuit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Test\" title=\"Test\">Test<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Programm\" title=\"Programme\">Programme<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Probleme\" title=\"Problems\">Problems<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Im_Ruhezustand_ist_die_Rote_LED_aus\" title=\"When idle, the red LED is off\">When idle, the red LED is off<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Sonstiges\" title=\"Miscellaneous\">Miscellaneous<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#NOT_Schaltung\" title=\"NOT circuit\">NOT circuit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#AND_Schaltung\" title=\"AND circuit\">AND circuit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#OR_Schaltung\" title=\"OR circuit\">OR circuit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#NOR_Schaltung\" title=\"OR gate\">OR gate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#RS-FlipFlop\" title=\"RS-FlipFlop\">RS-FlipFlop<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#XNOR\" title=\"XNOR\">XNOR<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#XOR\" title=\"XOR\">XOR<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Platine_Gelotet\" title=\"Soldered Plate\">Soldered Plate<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Ansicht\" title=\"View\">View<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Materialliste_BOM\" title=\"Materialliste\">Materialliste<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Fazit\" title=\"Conclusion\">Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Verwandte_Beitrage\" title=\"Related Posts\">Related Posts<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Quellen\" title=\"Sources\">Sources<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/#Log\" title=\"Log\">Log<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>Four NAND gates in one IC. With the first IC of the TTL series, further basic circuits can be created, so that only one type of IC would be needed. This made the IC so versatile and popular in its time. Unfortunately, the era of TTL components is over; today, these are mostly replaced by small controllers that can map complex logic by being programmed with software. Nevertheless, this component also marks the beginning of my TTL series. The use of these components serves to improve basic understanding, which is helpful as a basis for more complex circuits or also for programming. It cannot be ruled out that such a component might one day find application with a microcontroller, for example, to require fewer GPIOs. (Example: OR circuit for two collision buttons. As soon as one is pressed, there is a collision, but only one GPIO is needed (I know this is possible without a component \ud83d\ude09).<\/p>\n\n\n\n<p><a href=\"https:\/\/www.fambach.net\/en\/ttlerklaert\/\" data-type=\"post\" data-id=\"10909\">Was ist ein TTL IC?<\/a><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fakten\"><\/span>Facts<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Schaltzeichen_fur_NAND\"><\/span>NAND symbol<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"620\" height=\"110\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-06-01-14_08_41.jpg\" alt=\"\" class=\"wp-image-11074\"\/><figcaption class=\"wp-element-caption\">NAND Gate Symbol \u2013 Source: <a href=\"https:\/\/de.wikipedia.org\/wiki\/Logikgatter\">https:\/\/de.wikipedia.org\/wiki\/Logikgatter<\/a><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Schaltplan\"><\/span>Schematic<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"255\" height=\"229\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/7400_Quad_2-input_NAND_Gates.jpg\" alt=\"\" class=\"wp-image-10795\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Wahrheitstabelle\"><\/span>Truth table<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>NAND gate<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>#<\/th><th>1\/2\/3\/4 A<\/th><th>1\/2\/3\/4 B<\/th><th>1\/2\/3\/4 Y<\/th><th>Explanation<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>Both inputs LOW =&gt; output HIGH<\/td><\/tr><tr><td>2<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>Input A HIGH, B LOW =&gt; Output remains HIGH<\/td><\/tr><tr><td>3<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>Input A to LOW, B to HIGH =&gt; Output remains HIGH<\/td><\/tr><tr><td>4<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>Both inputs HIGH =&gt; output LOW, only LOW state<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Truth Table NAND<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Logiktester\"><\/span>Logic tester<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"930\" height=\"648\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-18-09_00_16.jpg\" alt=\"\" class=\"wp-image-10841\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Datenblatt\"><\/span>Data sheet<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.ti.com\/product\/de-de\/SN7400\">https:\/\/www.ti.com\/product\/de-de\/SN7400<\/a><\/p>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\"  class=\"wp-block-file__embed\" data=\"https:\/\/www.fambach.net\/wp-content\/uploads\/sn7400.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"Embed of sn7400.\"><\/object><a id=\"wp-block-file--media-35fb7efb-ffbf-458c-ad41-6065f0a1e3df\" href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/sn7400.pdf\">SN7400<\/a><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/sn7400.pdf\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-35fb7efb-ffbf-458c-ad41-6065f0a1e3df\">Download<\/a><\/div>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Anwendungsbereiche\"><\/span>Areas of application<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<ul>\n<li>Activation of ICs via bus address<\/li>\n\n\n\n<li>Input Control<\/li>\n\n\n\n<li>Logical sequences<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ansichten\"><\/span>Views<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-0 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"338\" data-id=\"10835\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/7400Klein-1.jpg\" alt=\"\" class=\"wp-image-10835\"\/><figcaption class=\"wp-element-caption\">7400 4x NAND gates \u2013 Front side<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.fambach.net\/en\/?attachment_id=10836\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"338\" data-id=\"10836\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/7400Rueckseite-1.jpg\" alt=\"\" class=\"wp-image-10836\"\/><\/a><figcaption class=\"wp-element-caption\">7400 4x NAND Gates \u2013 Rear<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Schaltung\"><\/span>Circuit<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"938\" height=\"631\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/7400Nand_Schaltplan.jpg\" alt=\"\" class=\"wp-image-10849\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"769\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/7400Nand_Steckplatine.jpg\" alt=\"\" class=\"wp-image-10851\"\/><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Test\"><\/span>Test<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"270\" data-id=\"10829\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20240518_084626.jpg\" alt=\"\" class=\"wp-image-10829\"\/><figcaption class=\"wp-element-caption\">NAND \u2013 Both inputs low, output high<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"270\" data-id=\"10830\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20240518_084632.jpg\" alt=\"\" class=\"wp-image-10830\"\/><figcaption class=\"wp-element-caption\">NAND \u2013 Input 1 High, Input 2 Low, Output High<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"270\" data-id=\"10827\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20240518_084635.jpg\" alt=\"\" class=\"wp-image-10827\"\/><figcaption class=\"wp-element-caption\">NAND gate \u2013 Input 1 Low, Input 2 High, Output High<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"270\" data-id=\"10828\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20240518_084642.jpg\" alt=\"\" class=\"wp-image-10828\"\/><figcaption class=\"wp-element-caption\">Nand \u2013 Both inputs high, output low<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"IC 7400 Nand Logic\" width=\"840\" height=\"473\" src=\"https:\/\/www.youtube.com\/embed\/x6BE26M3KZ0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption class=\"wp-element-caption\">NAND \u2013 Video about the images<\/figcaption><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Programm\"><\/span>Programme<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"c\" class=\"language-c\">\/** AND function *\/<br>bool and(bool e1, bool e2) {<br>    return e1 &amp;&amp; e2;<br>}<br><br>\/** Not a function *\/<br>bool not(bool e1){<br>  return !e1;<br>}<br><br>\/** NAND-funktion *\/<br>bool nand(bool e1, bool e2){<br>  return not (e1 and e2);<br>}<br><br>void main(){<br>  bool output1 = nand(true, true); <br>  bool output2 = not(and(true, true));<br>  \/\/ do some output <br>}<br><\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Probleme\"><\/span>Problems<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Im_Ruhezustand_ist_die_Rote_LED_aus\"><\/span>When idle, the red LED is off<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Not all ICs automatically pull inputs to ground, to resolve this issue pulldown resistors must be wired between the input and ground. 1kOhm is fine, higher values are also acceptable.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sonstiges\"><\/span>Miscellaneous<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"NOT_Schaltung\"><\/span>NOT circuit<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For an emergency circuit, two inputs of a NAND gate are connected. For example, pins 12 and 13 are connected; the input signal present at pin 12 is then output in inverted form at the output.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>#<\/th><th>Input A (12)<\/th><th>B (13)<\/th><th>Exit Z<\/th><th><\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>1<\/td><td>=A<\/td><td>0<\/td><td>Input to HIGH is inverted to output (LOW)<\/td><\/tr><tr><td>2<\/td><td>0<\/td><td>=A<\/td><td>1<\/td><td>The input on LOW is also inverted to the output (HIGH).<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">NAND \u2013 Gate Inputs A and B connected =&gt; NOT Gate<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"275\" height=\"102\" data-id=\"10928\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_06_06.jpg\" alt=\"\" class=\"wp-image-10928\"\/><figcaption class=\"wp-element-caption\">NOT with NAND, Input LOW, Output HIGH<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"273\" height=\"101\" data-id=\"10927\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_05_48.jpg\" alt=\"\" class=\"wp-image-10927\"\/><figcaption class=\"wp-element-caption\">NOT with NAND, input HIGH; output HIGH<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AND_Schaltung\"><\/span>AND circuit<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For the AND circuit, two gates are needed, one configured as a NAND and one as a NOT.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>#<\/th><th>A<\/th><th>B<\/th><th>C<\/th><th>D<\/th><th>Explanation<\/th><\/tr><\/thead><tbody><tr><td><strong>1<\/strong><\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>Both inputs on LOW, output is also LOW<\/td><\/tr><tr><td><strong>2<\/strong><\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>Input A HIGH, B LOW, Output LOW<\/td><\/tr><tr><td><strong>3<\/strong><\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>Input A to LOW, B to HIGH, Output LOW<\/td><\/tr><tr><td><strong>4<\/strong><\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>Both inputs high, therefore the output is high<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">NAND \u2013 Truth table AND circuit<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-4 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"361\" height=\"82\" data-id=\"10932\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_12_57.jpg\" alt=\"\" class=\"wp-image-10932\"\/><figcaption class=\"wp-element-caption\">AND gate circuit, A LOW, B LOW, Y HIGH, Z LOW<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"357\" height=\"77\" data-id=\"10929\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_13_17.jpg\" alt=\"\" class=\"wp-image-10929\"\/><figcaption class=\"wp-element-caption\">AND gate circuit, A HIGH, B LOW, Y HIGH, Z LOW<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"360\" height=\"83\" data-id=\"10931\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_13_42.jpg\" alt=\"\" class=\"wp-image-10931\"\/><figcaption class=\"wp-element-caption\">AND gate circuit, A low, B high, Y high, Z low<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"361\" height=\"79\" data-id=\"10930\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_14_31.jpg\" alt=\"\" class=\"wp-image-10930\"\/><figcaption class=\"wp-element-caption\">AND gate circuit, A HIGH, B HIGH, Y LOW, Z HIGH<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"OR_Schaltung\"><\/span>OR circuit<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The OR gate requires three gates. The output is HIGH as soon as one of the inputs is set to HIGH.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>#<\/th><th>A<\/th><th>B<\/th><th>A<\/th><th>!B<\/th><th>Z<\/th><th><\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>Both inputs low, output low<\/td><\/tr><tr><td>2<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>Input A to HIGH and B to LOW, output to HIGH<\/td><\/tr><tr><td>3<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>Input A to LOW and B to HIGH, output to HIGH<\/td><\/tr><tr><td>4<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>Both inputs to HIGH, output to HIGH<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">NAND - Truth Table OR Circuit<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-5 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"343\" height=\"122\" data-id=\"10937\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_26_54.jpg\" alt=\"\" class=\"wp-image-10937\"\/><figcaption class=\"wp-element-caption\">OR circuit A LOW, B LOW, !A HIGH, !B HIGH, Z LOW<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"343\" height=\"123\" data-id=\"10941\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_29_15.jpg\" alt=\"\" class=\"wp-image-10941\"\/><figcaption class=\"wp-element-caption\">OR circuit A HIGH, B LOW, !A LOW, !B HIGH, Z HIGH<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"344\" height=\"120\" data-id=\"10938\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_26_38.jpg\" alt=\"\" class=\"wp-image-10938\"\/><figcaption class=\"wp-element-caption\">OR gate A LOW, B HIGH, !A HIGH, !B LOW, Z HIGH<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"333\" height=\"122\" data-id=\"10939\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-25-20_26_14.jpg\" alt=\"\" class=\"wp-image-10939\"\/><figcaption class=\"wp-element-caption\">OR circuit: A HIGH, B HIGH, !A LOW, !B LOW, Z HIGH<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"NOR_Schaltung\"><\/span>OR gate<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Naturally, a NOR gate circuit is also possible. For this, another gate must be added to negate the output. If one of the inputs is HIGH, the output is always LOW.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>#<\/th><th>A<\/th><th>B<\/th><th>A<\/th><th>!B<\/th><th>Z<\/th><th>Explanation<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>Both inputs LOW, the output is HIGH<\/td><\/tr><tr><td>2<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>Input A to HIGH and B to LOW, output to LOW<\/td><\/tr><tr><td>3<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>Input A to LOW and B to HIGH, Output to LOW<\/td><\/tr><tr><td>4<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>Both inputs are HIGH, the output is LOW<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">NAND - Truth Table NOR Circuit<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-6 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"361\" height=\"142\" data-id=\"10996\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_32_59.jpg\" alt=\"\" class=\"wp-image-10996\"\/><figcaption class=\"wp-element-caption\">NAND \u2013 NOR Gates, Input A and B LOW, Initial State<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"341\" height=\"141\" data-id=\"10994\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_28_21.jpg\" alt=\"\" class=\"wp-image-10994\"\/><figcaption class=\"wp-element-caption\">NAND \u2013 NOR gates, input A HIGH and B LOW<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"341\" height=\"145\" data-id=\"10995\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_28_40.jpg\" alt=\"\" class=\"wp-image-10995\"\/><figcaption class=\"wp-element-caption\">NAND \u2013 NOR gates, input A LOW and B HIGH<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"342\" height=\"141\" data-id=\"10992\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_28_58.jpg\" alt=\"\" class=\"wp-image-10992\"\/><figcaption class=\"wp-element-caption\">NAND \u2013 NOR gate, input A and B HIGH<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"RS-FlipFlop\"><\/span>RS-FlipFlop<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>An RS flip-flop can also be built with the 4 gates of the 7400. The S (set) and R (reset) inputs must be negated and the outputs fed back to an input respectively. In the simulation, the outputs initially have an undefined state. In reality, it is either set or reset. The interesting thing about the RS flip-flop is that the state remains after releasing the S button and is only reset again when the R button is pressed. Thus, we can store 1 bit.<\/p>\n\n\n\n<p>Through feedback, the preceding state must always be taken into account. For example, if Set is set to HIGH and then back to LOW, Q1 remains HIGH.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>#<\/th><th>S<\/th><th>R<\/th><th>!S<\/th><th>!R<\/th><th>Q1<\/th><th>!Q1<\/th><th>Explanation<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>*<\/td><td>*<\/td><td>Initial state<\/td><\/tr><tr><td>2<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>Set to HIGH<\/td><\/tr><tr><td>3<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>Set saved<\/td><\/tr><tr><td>4<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>Rest on high<\/td><\/tr><tr><td>5<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>Settings saved<\/td><\/tr><tr><td>6 <\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>Unacceptable condition<\/td><\/tr><tr><td>7<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>Resetz is selected<\/td><\/tr><tr><td>8<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>Reset saved<\/td><\/tr><tr><td>9<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>Unacceptable condition (2)<\/td><\/tr><tr><td>10<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>The set is chosen<\/td><\/tr><tr><td>11<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>Zustand gespeichert<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">NAND \u2013 RS-Flipflop Truth Table Circuit<\/figcaption><\/figure>\n\n\n\n<p>State 6, both inputs on HIGH, is impermissible. The subsequent process depends on which of the two inputs is set to LOW first. This results in the respective other one counting. If S is set to LOW first, the R input counts, meaning !Q1 is active. In the opposite case, if R is set to LOW first, the S input counts, and Q1 is active. <\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-7 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"360\" height=\"153\" data-id=\"10997\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_35_01.jpg\" alt=\"\" class=\"wp-image-10997\"\/><figcaption class=\"wp-element-caption\">NAND RS-FlipFlop \u2013 Initial State<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"371\" height=\"153\" data-id=\"10998\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_35_28.jpg\" alt=\"\" class=\"wp-image-10998\"\/><figcaption class=\"wp-element-caption\">NAND RS-FlipFlop \u2013 Set<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"373\" height=\"152\" data-id=\"11001\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_38_22.jpg\" alt=\"\" class=\"wp-image-11001\"\/><figcaption class=\"wp-element-caption\">NAND RS-Flipflop - Set stored<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"372\" height=\"150\" data-id=\"10999\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_38_56.jpg\" alt=\"\" class=\"wp-image-10999\"\/><figcaption class=\"wp-element-caption\">NAND RS-FlipFlop \u2013 Resetting<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"371\" height=\"153\" data-id=\"11000\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_39_15.jpg\" alt=\"\" class=\"wp-image-11000\"\/><figcaption class=\"wp-element-caption\">NAND RS-FlipFlop \u2013 Resetting stored<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"372\" height=\"151\" data-id=\"11002\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-05-31-10_40_20.jpg\" alt=\"\" class=\"wp-image-11002\"\/><figcaption class=\"wp-element-caption\">NAND RS-FlipFlop \u2013 Illegal state<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"XNOR\"><\/span>XNOR<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The output is always HIGH when the inputs have the same potential (A=B= LOW or A=B=HIGH). This circuit requires more than just one IC.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>#<\/th><th>A<\/th><th>B<\/th><th>A<\/th><th>!B<\/th><th>C<\/th><th>D<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>2<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>3<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>4<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">XNOR circuit truth table<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-8 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"421\" height=\"231\" data-id=\"11068\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-06-01-13_42_32-1.jpg\" alt=\"\" class=\"wp-image-11068\"\/><figcaption class=\"wp-element-caption\">7400 - XOR gate, both inputs LOW, output LOW<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"421\" height=\"230\" data-id=\"11067\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-06-01-13_44_10.jpg\" alt=\"\" class=\"wp-image-11067\"\/><figcaption class=\"wp-element-caption\">7400- XNOR Gate Input A HIGH, B LOW Output HIGH<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"421\" height=\"231\" data-id=\"11066\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-06-01-13_44_45.jpg\" alt=\"\" class=\"wp-image-11066\"\/><figcaption class=\"wp-element-caption\">7400 - XNOR gate input A LOW, B HIGH output HIGH<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"421\" height=\"231\" data-id=\"11065\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-06-01-13_45_12.jpg\" alt=\"\" class=\"wp-image-11065\"\/><figcaption class=\"wp-element-caption\">7400 - XOR gate, both inputs HIGH, output LOW<\/figcaption><\/figure>\n<figcaption class=\"blocks-gallery-caption wp-element-caption\">NOR \u2013 XNOR circuit<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"XOR\"><\/span>XOR<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In an XOR gate, the output is HIGH when the inputs are different. This circuit requires 1.5 ICs.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>#<\/th><th>A<\/th><th>B<\/th><th>A<\/th><th>!B<\/th><th>C<\/th><th>D<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>2<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>3<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>4<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">XOR Circuit Truth Table<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-9 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"501\" height=\"181\" data-id=\"11054\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-06-01-10_09_57.jpg\" alt=\"\" class=\"wp-image-11054\"\/><figcaption class=\"wp-element-caption\">XOR \u2013 XOR gate, both inputs LOW, output LOW<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"501\" height=\"181\" data-id=\"11053\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-06-01-10_10_17.jpg\" alt=\"\" class=\"wp-image-11053\"\/><figcaption class=\"wp-element-caption\">XOR \u2013 XNOR circuit, input A HIGH, B LOW, output HIGH<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"501\" height=\"181\" data-id=\"11052\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-06-01-10_10_34.jpg\" alt=\"\" class=\"wp-image-11052\"\/><figcaption class=\"wp-element-caption\">XOR \u2013 XNOR circuit, input A LOW, B HIGH, output HIGH<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"501\" height=\"181\" data-id=\"11051\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/2024-06-01-10_10_54.jpg\" alt=\"\" class=\"wp-image-11051\"\/><figcaption class=\"wp-element-caption\">XOR \u2013 XOR circuit, both inputs HIGH, output LOW<\/figcaption><\/figure>\n<figcaption class=\"blocks-gallery-caption wp-element-caption\">OR - XOR Circuit<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Platine_Gelotet\"><\/span>Soldered Plate<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>I apologise for the chaos on the circuit board, I had to retrieve skills I hadn't used for decades. The blueprint generally corresponds to the one shown above. The jumpers disconnect the LEDs and the switch from the IC to allow other circuits to be built. By the way, I am operating the circuit board with 6V (4x 1.5v AAA batteries).<\/p>\n\n\n\n<p>I accidentally used a 16-pin IC socket. Desoldering was not an option and I didn't want to remove the bridge to ground anymore, so I simply connected pins 7 and 8 of the socket. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ansicht\"><\/span>View<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-1 is-cropped wp-block-gallery-10 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"287\" data-id=\"11088\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/7400PlatineVorderseite-1.jpg\" alt=\"\" class=\"wp-image-11088\"\/><figcaption class=\"wp-element-caption\">7400 Solder board \u2013 Front side<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"279\" data-id=\"11087\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/7400PlatineRueckseite-1.jpg\" alt=\"\" class=\"wp-image-11087\"\/><figcaption class=\"wp-element-caption\">7400 Solderboard \u2013 Backside Chaos.<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Materialliste_BOM\"><\/span>Materialliste<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Component<\/th><th>Number<\/th><\/tr><\/thead><tbody><tr><td>LED Green\/Yellow\/Red (Can also be the same colour)<\/td><td>3<\/td><\/tr><tr><td>Jumper (Red, Green, and Yellow correspond to the selected LED colours)<\/td><td>3<\/td><\/tr><tr><td>2 straight Polig pins<\/td><td>3<\/td><\/tr><tr><td>2 angled pole pins for power supply<\/td><td>1<\/td><\/tr><tr><td>7-pin plug for additional connections<\/td><td>3<\/td><\/tr><tr><td> Buttons with long press<\/td><td>2<\/td><\/tr><tr><td>1K resistor (pulldown\/pre-resistor for LED)<\/td><td>5<\/td><\/tr><tr><td>14-pin IC socket<\/td><td>1<\/td><\/tr><tr><td>Silver wire for the connections on the back<\/td><td>?<\/td><\/tr><tr><td>Solder<\/td><td>? <\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">7402 Solder board material list<\/figcaption><\/figure>\n\n\n\n<p><strong>Addendum<\/strong> If you connect the LEDs in series with the pulldown resistors, you can save two resistors. The voltage of 3.5V (5V supply voltage - 1.5V LED) at the input of the IC should be sufficient to generate a HIGH.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fazit\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>A fascinating IC. Very diverse in its function. With it, by using all the gates, one can create other basic logic functions such as AND, NOR, OR, NOT, and even higher logic functions like an R\/S flip-flop.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Verwandte_Beitrage\"><\/span>Related Posts<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n<ul class=\"display-posts-listing\">\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/ttl7402\/\">TTL IC 7402<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/ttlerklaert\/\">TTL \u2013 Transistor-Transistor Logic ICs<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/ttl7400\/\">TTL IC 7400<\/a><\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quellen\"><\/span>Sources<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p><a href=\"https:\/\/de.wikipedia.org\/wiki\/7400\">https:\/\/de.wikipedia.org\/wiki\/7400<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.elektronik-kompendium.de\/service\/ttlcode.php\">TTL Code Database<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.elektronik-kompendium.de\">https:\/\/www.elektronik-kompendium.de<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/sourceforge.net\/projects\/circuit\">https:\/\/sourceforge.net\/projects\/circuit<\/a> (Logic Sim, I use it for my drawings)<\/p>\n\n\n\n<p><a href=\"http:\/\/www.cburch.com\/logisim\/de\/index.html\">LogiSim \u2013 Circuit simulator<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/logigator.com\/editor\">https:\/\/logigator.com\/editor<\/a><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Log\"><\/span>Log<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Date<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>16.05.2024<\/td><td>Entry created<\/td><\/tr><tr><td>18.05.2024<\/td><td>Pictures taken, circuit assembled and tested. <\/td><\/tr><tr><td>24.05.2024<\/td><td>Error corrected and link to TTL IC inserted. Logic circuits added. <\/td><\/tr><tr><td>25.05.2024<\/td><td>Live<\/td><\/tr><tr><td>30.05.2024<\/td><td>An RS flip-flop can be implemented using NAND gates. Board soldered.<\/td><\/tr><tr><td>31.05.2024<\/td><td>Added RS-FlipFlop and made a few marginal improvements.<\/td><\/tr><tr><td>01.06.2024<\/td><td>XOR and XNOR added. Photos of the circuit board added.<\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">LOG<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>The 7400 IC contains 4 NAND gates, each with two inputs.<\/p>\n<a href=\"https:\/\/www.fambach.net\/en\/ttl7400\/\" class=\"read-more-link\">Carry on reading <span class=\"screen-reader-text\">\"TTL IC 7400\"<\/span> <span class=\"meta-nav\">\u2192<\/span><\/a>","protected":false},"author":1,"featured_media":10839,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[785],"tags":[788,787,283,786],"modified_by":"sfambach","_links":{"self":[{"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/posts\/10794"}],"collection":[{"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/comments?post=10794"}],"version-history":[{"count":32,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/posts\/10794\/revisions"}],"predecessor-version":[{"id":11095,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/posts\/10794\/revisions\/11095"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/media\/10839"}],"wp:attachment":[{"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/media?parent=10794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/categories?post=10794"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/tags?post=10794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}