{"id":375,"date":"2018-08-15T18:12:30","date_gmt":"2018-08-15T18:12:30","guid":{"rendered":"https:\/\/justanotherelectronicsblog.com\/?p=375"},"modified":"2018-08-15T18:12:30","modified_gmt":"2018-08-15T18:12:30","slug":"ecl-logic-ramblings","status":"publish","type":"post","link":"https:\/\/justanotherelectronicsblog.com\/?p=375","title":{"rendered":"ECL logic ramblings"},"content":{"rendered":"<p>ECL logic, or emitter coupled logic is a family of very high speed logic. with ECL logic, a transistor is never completely on or off, meaning the transistor is never saturated, making it very fast. It also makes it weird and quirky, interesting enough to have a look at. First of all, ECL logic generally works on -5V instead of 5V, though later it was also available using a more normal 5V power. Second of all, the logic level is not 0V and -5V, but roughly -0.8V and -1.6V. Third, most ECL logic has 2 outputs, a normal and an inverting one. This can be used to make logic design easier or to have an differential pair output for noise immunity. ECL was used in multiple well known designs, for example the Cray-1 supercomputer used ECL.<\/p>\n<p>All in all, interesting devices. The easiest way to experiment with them is by buying some logic devices. ON semiconductors still makes them, the NC10EP01 for example is a single gate OR\/NOR that can be used with 5V or -5V as power supply. It&#8217;s a very fast device, reaching over 3Ghz switching speeds. The datasheet can be viewed <a href=\"http:\/\/www.onsemi.com\/pub\/Collateral\/MC10EP01-D.PDF\">here<\/a>.<\/p>\n<p>But where is the fun in that, it&#8217;s much more fun to make a few gates. The schematic for a NOR gate is easy to find, it&#8217;s even listed on the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Emitter-coupled_logic\">Wikipedia page about ECL<\/a>. I changed the schematic a bit to make a 4 input NOR. I also made an SR latch based on the design found <a href=\"http:\/\/www.6502.org\/users\/dieter\/decl\/decl1.htm\">here<\/a>. The schematic for the NOR gate is:<\/p>\n<p><!--more--><\/p>\n<p><a href=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_090.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-379\" src=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_090-1024x420.png\" alt=\"\" width=\"1024\" height=\"420\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_090-1024x420.png 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_090-300x123.png 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_090-768x315.png 768w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_090.png 2016w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>And for the Latch:<\/p>\n<p><a href=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_091.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-380\" src=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_091-1024x553.png\" alt=\"\" width=\"1024\" height=\"553\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_091-1024x553.png 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_091-300x162.png 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_091-768x414.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>A few small PCB&#8217;s where made for this, both with the same pinout as they both have 4 inputs and 2 outputs. Each PCB has 2 headers for the power supply to make routing easier when using multiple boards.<\/p>\n<p><a href=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/IMG_0869-DDA70E6E-CB70-4790-8203-B32BF61B4A0A-17163-00000D9F06185507-e1534351465251.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-381\" src=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/IMG_0869-DDA70E6E-CB70-4790-8203-B32BF61B4A0A-17163-00000D9F06185507-e1534351465251-768x1024.jpg\" alt=\"\" width=\"657\" height=\"876\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/IMG_0869-DDA70E6E-CB70-4790-8203-B32BF61B4A0A-17163-00000D9F06185507-e1534351465251-768x1024.jpg 768w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/IMG_0869-DDA70E6E-CB70-4790-8203-B32BF61B4A0A-17163-00000D9F06185507-e1534351465251-225x300.jpg 225w\" sizes=\"auto, (max-width: 657px) 100vw, 657px\" \/><\/a><\/p>\n<p>As ECL has a -0.8V to -1.6V logic level, interfacing with it is a bit challenging. To help with this a small circuit is needed to turn ECL to 0-5V and back, so interfacing with it is easier. The circuit I used for this is as follows:<br \/>\n<a href=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_092.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-382\" src=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_092-1024x384.png\" alt=\"\" width=\"1024\" height=\"384\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_092-1024x384.png 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_092-300x113.png 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_092-768x288.png 768w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/Selection_092.png 1542w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>To turn ECL to 0-5V, a comparator with an external transistor is used. Any comparator that can be used with +5\/-5V supply is usable, the LM339 is a cheap, but slow, option. As ECL outputs are differential, no extra circuitry is needed and it can be directly fed into the comparator. The external transistor might not always be needed, but for driving an LED it can be. To turn 0-5V to ECL, a similar circuit is used, with 1 input connected to 2.5V and the other to the 0-5V signal. The external transistor has a -1.8V and -0.6V supply, with losses this translates to roughly -0.8V to -1.6V, but a few tenths of a volt different is no problem. A circuit board was made to fit a few ECL NOR\/LATCH PCB&#8217;s, with some LEDs and switches to make testing easier.<\/p>\n<p><a href=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/IMG_0863-87ACA901-5403-497B-B1C6-C6AA3EC77E7B-16972-00000D8B3D25DEA3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-384\" src=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/IMG_0863-87ACA901-5403-497B-B1C6-C6AA3EC77E7B-16972-00000D8B3D25DEA3-1024x768.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/IMG_0863-87ACA901-5403-497B-B1C6-C6AA3EC77E7B-16972-00000D8B3D25DEA3-1024x768.jpg 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/IMG_0863-87ACA901-5403-497B-B1C6-C6AA3EC77E7B-16972-00000D8B3D25DEA3-300x225.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/IMG_0863-87ACA901-5403-497B-B1C6-C6AA3EC77E7B-16972-00000D8B3D25DEA3-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Overall, both the NOR and the LATCH worked as expected and are both reasonably fast, easy in the dozens of Mhz range. A far cry from commercial ECL devices, but interesting nonetheless. The rise and fall time of the NOR gate are as follows, blue being the input and yellow the output, especially on risetime the NOR is faster then the input:<br \/>\n<a href=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/risetime1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-385\" src=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/risetime1-300x180.png\" alt=\"\" width=\"300\" height=\"180\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/risetime1-300x180.png 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/risetime1-768x461.png 768w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/risetime1.png 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><a href=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/falltime.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-386\" src=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/falltime-300x180.png\" alt=\"\" width=\"300\" height=\"180\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/falltime-300x180.png 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/falltime-768x461.png 768w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/falltime.png 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The Kicad designs can be downloaded <a href=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2018\/08\/ecl.zip\">here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ECL logic, or emitter coupled logic is a family of very high speed logic. with ECL logic, a transistor is never completely on or off, meaning the transistor is never saturated, making it very fast. It also makes it weird and quirky, interesting enough to have a look at. First of all, ECL logic generally [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-375","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ECL logic ramblings - jaeblog<\/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:\/\/justanotherelectronicsblog.com\/?p=375\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ECL logic ramblings - jaeblog\" \/>\n<meta property=\"og:description\" content=\"ECL logic, or emitter coupled logic is a family of very high speed logic. with ECL logic, a transistor is never completely on or off, meaning the transistor is never saturated, making it very fast. 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