{"id":1006,"date":"2020-10-07T02:24:43","date_gmt":"2020-10-07T02:24:43","guid":{"rendered":"http:\/\/learnlearn.uk\/alevelcs\/?page_id=1006"},"modified":"2021-03-26T07:00:24","modified_gmt":"2021-03-26T07:00:24","slug":"flip-flop-circuits","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/alevelcs\/flip-flop-circuits\/","title":{"rendered":"Flip Flop Circuits"},"content":{"rendered":"<div class=\"responsive-tabs\">\n<h2 class=\"tabtitle\">Introduction<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Introduction<\/h3>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">SR Flip Flop (Active High)<\/h2>\n<div class=\"tabcontent\">\n\n<h3>SR Flip Flop (Active High)<\/h3>\n<ul>\n<li>Consists of two <strong>NOR<\/strong> gates<\/li>\n<li>The inputs are both normally set to Low.<\/li>\n<li>Only pulses of high set or reset the flip flop.<\/li>\n<li>Sending a pulse on Set sets Q to high and Q Compliment to Low<\/li>\n<li>Sending a pulse on Reset sets Q to low and Q Compliment to high.<\/li>\n<\/ul>\n<div id=\"attachment_1026\" style=\"width: 760px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/youtu.be\/8wetFltb_9Y\"><img aria-describedby=\"caption-attachment-1026\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-1026 size-large\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/active-high-SR-latch-1024x522.png\" alt=\"\" width=\"750\" height=\"382\" srcset=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/active-high-SR-latch-1024x522.png 1024w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/active-high-SR-latch-300x153.png 300w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/active-high-SR-latch-768x392.png 768w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/active-high-SR-latch.png 1221w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/a><p id=\"caption-attachment-1026\" class=\"wp-caption-text\"><a href=\"https:\/\/youtu.be\/8wetFltb_9Y\">Click here to watch the demonstration video<\/a><\/p><\/div>\n<p><strong>Tutorial Video<\/strong><\/p>\n<div class=\"nv-iframe-embed\">\n<div class=\"container-lazyload preview-lazyload container-youtube js-lazyload--not-loaded\"><a href=\"https:\/\/www.youtube.com\/watch?v=-aQH0ybMd3U\" class=\"lazy-load-youtube preview-lazyload preview-youtube\" data-video-title=\"Latches and Flip-Flops 1 - The SR Latch\" title=\"Play video &quot;Latches and Flip-Flops 1 - The SR Latch&quot;\">https:\/\/www.youtube.com\/watch?v=-aQH0ybMd3U<\/a><noscript>Video can&#8217;t be loaded because JavaScript is disabled: <a href=\"https:\/\/www.youtube.com\/watch?v=-aQH0ybMd3U\" title=\"Latches and Flip-Flops 1 - The SR Latch\">Latches and Flip-Flops 1 &#8211; The SR Latch (https:\/\/www.youtube.com\/watch?v=-aQH0ybMd3U)<\/a><\/noscript><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">SR Flip-Flop (Active Low)<\/h2>\n<div class=\"tabcontent\">\n\n<h3>SR Flip-Flop (Active Low)<\/h3>\n<ul>\n<li>Consists of two <strong>NAND<\/strong> gates<\/li>\n<li>The inputs are both normally set to High.<\/li>\n<li>Only pulses of low set or reset.<\/li>\n<li>Sending a pulse on Set sets Q to high and Q Compliment to Low<\/li>\n<li>Sending a pulse on Reset sets Q to low and Q Compliment to high.<\/li>\n<\/ul>\n<div id=\"attachment_1027\" style=\"width: 760px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/youtu.be\/gGBMaN56yAE\"><img aria-describedby=\"caption-attachment-1027\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-1027 size-large\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/SR-Latch-Active-Low-1024x433.png\" alt=\"\" width=\"750\" height=\"317\" srcset=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/SR-Latch-Active-Low-1024x433.png 1024w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/SR-Latch-Active-Low-300x127.png 300w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/SR-Latch-Active-Low-768x324.png 768w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/10\/SR-Latch-Active-Low.png 1316w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/a><p id=\"caption-attachment-1027\" class=\"wp-caption-text\"><a href=\"https:\/\/youtu.be\/gGBMaN56yAE\">Click here to watch a demonstration<\/a><\/p><\/div>\n\n<\/div><h2 class=\"tabtitle\">JK Flip-Flop<\/h2>\n<div class=\"tabcontent\">\n\n<h3>The problem with SR Flip Flops<\/h3>\n<p>A problem with the SR flip flop occurs when both the Set and Reset inputs receive pulses at the same time. This would result in a race condition where both the Q and Q Complement are trying to toggle each other. The end result would be an invalid state (Either 0-0 or 1-1).<\/p>\n<p>In order rectify the problem the JK flip-flop can be used instead.<\/p>\n<p><strong>JK Flip Flop<\/strong><\/p>\n<div class=\"nv-iframe-embed\">\n<div class=\"container-lazyload preview-lazyload container-youtube js-lazyload--not-loaded\"><a href=\"https:\/\/www.youtube.com\/watch?v=Hi7rK0hZnfc\" class=\"lazy-load-youtube preview-lazyload preview-youtube\" data-video-title=\"How Flip Flops Work - The Learning Circuit\" title=\"Play video &quot;How Flip Flops Work - The Learning Circuit&quot;\">https:\/\/www.youtube.com\/watch?v=Hi7rK0hZnfc<\/a><noscript>Video can&#8217;t be loaded because JavaScript is disabled: <a href=\"https:\/\/www.youtube.com\/watch?v=Hi7rK0hZnfc\" title=\"How Flip Flops Work - The Learning Circuit\">How Flip Flops Work &#8211; The Learning Circuit (https:\/\/www.youtube.com\/watch?v=Hi7rK0hZnfc)<\/a><\/noscript><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p><strong>Past Paper Questions<\/strong><\/p>\n<p><a href=\"https:\/\/pastpapers.papacambridge.com\/view.php?id=Cambridge%20International%20Examinations%20%28CIE%29\/AS%20and%20A%20Level\/Computer%20Science%20-%209608\/2016%20Jun\/9608_s16_qp_31.pdf\">May 2016 31 qn10<\/a><\/p>\n<p><a href=\"https:\/\/pastpapers.papacambridge.com\/view.php?id=Cambridge%20International%20Examinations%20%28CIE%29\/AS%20and%20A%20Level\/Computer%20Science%20-%209608\/2017%20Nov\/9608_w17_qp_31.pdf\">Nov 17 31 Qn 5<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SR Flip Flop (Active High) Consists of two NOR gates The inputs are both normally set to Low. Only pulses of high set or reset the flip flop. Sending a pulse on Set sets Q to high and Q Compliment to Low Sending a pulse on Reset sets Q&hellip;&nbsp;<a href=\"https:\/\/learnlearn.uk\/alevelcs\/flip-flop-circuits\/\" class=\"\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Flip Flop Circuits<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"on","neve_meta_content_width":84,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Flip Flop Circuits - A Level Computer Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnlearn.uk\/alevelcs\/flip-flop-circuits\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Flip Flop Circuits - A Level Computer Science\" \/>\n<meta property=\"og:description\" content=\"Introduction &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SR Flip Flop (Active High) Consists of two NOR gates The inputs are both normally set to Low. 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