Note The ”Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaran- teed The device should not be operated at. 74LS20 datasheet, 74LS20 pdf, 74LS20 data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Dual 4-Input NAND Gate. 74LS Absolute Maximum Ratings(Note 1). Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be.

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Have I wired this wrong?

74LS20 데이터시트(PDF) – National Semiconductor (TI)

I wonder if there is a rogue datasheet somewhere which has mixed that unusual “W” package pinout, with the “N” package pinout? Arduino Pro Mini PeterBennett – Yes, agreed. Home Questions Tags Users Unanswered. I’m using a quad input due to lack of components. A couple more points: Peter – Absolutely agreed.

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You can also call us at or send us a message through our Facebook page. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. This device contains two independent gates each of which performs the logic NAND 74ls220.


Sign up using Facebook. 7ls20 in a “W” ceramic flat-pack package, the uses pin 11 as Gnd: I have this circuit: That would be correct for an unusual package military temperature version of in a ceramic flat-pack but is not correct for a standard 74LS20 in “N” package plastic DIP like yours. Engineered in the Philippines.

74LS20 Datasheet(PDF) – Hitachi Semiconductor

Arduino basics with Tinker Danica. However, there is one clear bug: Popular Products Tinkduino Leo. Post as a guest Name.

Your LED will be drawing more than 0. This won’t be doing the IC any good, although I hope that permanent damage won’t happen.

I’ve tried the same circuit with a couple of IC’s in case one was faulty, but the same behavior is exhibited. There is no connection from IC pin 7 to Gnd 0V.

74LS20 – Dual 4 Input NAND Gate

Our office is open: As already commented by John Da real schematic would definitely help readers. The administrators are still migrating contents to our new home. The problem I see is not so much that pin 11 is connected to Gnd; but 74ls220 pin 7 is not connected to Gnd.


A real schematic rather than a photo of your breadboard might help you get an answer to your question. Sign up using Email and Password.

(PDF) 74LS20 Datasheet download

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Some functions may be missing or not functioning. Powered by Rethink Tech Inc. I wonder if you have misinterpreted whatever IC datasheet you have been looking at, if it contains that unusual pinout, with Gnd on pin 11? It’s been a very long time since I’ve messed around with this stuff so maybe I’ve forgotten something fundamentally intuitive about electronics, apologies if that is the case.

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