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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74LS20 PIN CONFIGURATION datasheet & applicatoin notes – Datasheet Archive

Sign up or log in Sign up using Google. Have I wired this wrong? Our office is open: Whereas in a dztasheet ceramic flat-pack package, the uses pin 11 as Gnd: Please add that and re-test. Powered by Rethink Tech Inc. I’m using a quad input due to lack of components. Product Group Product Description. Arduino Pro Mini This won’t be doing the IC any good, although I hope that permanent damage won’t happen. For all your product inquiries, send us a message on our Contact Page with the Product Inquiry subject.

Create new account Request new password. PeterBennett – Yes, agreed. There is no connection from IC pin 7 to Gnd 0V. Skip to main content.

Peter – Absolutely agreed. Email Required, but never shown. Some functions may be missing or not functioning. Your LED will be drawing more than 0. I have this circuit: As eatasheet commented by John Da real schematic would definitely help readers.


If you have any amazing things dtaasheet want to discuss with Tinkbox, don’t hesitate to contact us:. However, there is one clear bug: I wonder if there is a rogue datasheet somewhere which has mixed that unusual “W” package pinout, with the “N” package pinout? The problem I see is not so much that pin 11 is connected to Gnd; but that pin 7 is not connected to Gnd.

FYI connecting anything to an “NC” pin is dztasheet. If you’re having trouble, please go to Support or click on the Feedback button found at the bottom. 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. However it seems that you have connected IC pin 11 to Gnd. I just couldn’t think of another reason why there is a Gnd connection on pin 11 – that was the only hypothesis I could think of.

The fact that at least some datasheets like the TI one show both pinouts, could perhaps allow someone to look at the wrong pinout when switching between looking at the catasheet, and looking at the breadboard, while wiring the breadboard? Sign up using Email and Password. It is interesting that pin 11 is connected to Gnd on the OP’s breadboard, for the reason I explain in my answer.

74LS20 Dual 4-input NAND Gate IC | Jaycar Electronics

Home Questions Tags Users Unanswered. 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. Order Information Free shipping. Hopefully the OP can explain why they did this. How to Make Learning More Fun? 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.


Uno R3 Arduino Comp This device contains two independent gates each of which performs the logic NAND function. Tinkbox is currently in beta mode. A real schematic rather than a photo of your breadboard might help you get an answer to your question. You can place your order any day and time.

74LS20 Dual 4-Input NAND IC

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? Engineered in the Philippines. I’ve tried the dafasheet circuit with a couple of IC’s in case one was faulty, but the same behavior is exhibited.

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