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

Post as a guest Name. 7l4s20 up using Facebook. Your LED will be drawing more than 0. Mega R3 Arduin 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. 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.

If you have any amazing things you want to discuss with Tinkbox, datasheey hesitate to datasheeg us:. Peter – Absolutely agreed. Powered by Rethink Tech Inc. Other Services Custom Projects. Sign up or log in Sign up using Google. 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. Sign up using Email and Password.

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Arduino Pro Mini However it seems that you have connected IC pin 11 to Gnd. When I throw the switches to the up position, as pictured, 744ls20 circuit is shorted to ground, which should pull the input pins low, meaning the output pin is high and the LED lights. Engineered in the Philippines. As already commented by John Da real schematic would definitely help readers.

74LS20 Datasheet – BooknStuff

A real schematic rather than a photo of your breadboard might help you get an answer to your question. A couple more points: PeterBennett – Yes, agreed.

Therefore if you see a datasheef labelled “NC”, the least risky option is not to connect anything to it. Home Questions Tags Users Unanswered. FYI connecting anything to an “NC” pin is risky. You can place your order any day and time. The problem I see is not so much that pin 11 is connected to Gnd; but that pin 7 is not connected to Gnd.

This won’t be doing the IC any good, although I hope that permanent damage won’t happen. 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?

Have I wired this wrong? You can also call us catasheet or send us a message through our Facebook page. There is no connection from IC pin 7 to Gnd 0V. Some functions may be missing or not functioning. Popular Products Tinkduino Leo. 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 datasheet, and looking at the breadboard, while wiring the breadboard?

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I’ve tried to pair datxsheet inputs together as I want it to function as a dual input gate.

74LS20 Dual 4-input NAND Gate

I wonder if there is a rogue datasheet somewhere which has mixed that unusual “W” package pinout, with the “N” package pinout? It is interesting that pin 11 is connected to Gnd on the OP’s breadboard, for the reason I explain in my answer. Tinkbox is currently in beta mode. Pin 11 is a no-connect on the normal DIP package, so grounding that pin has no effect. I’m using a quad input due to lack of components. Contact Infomation If you have any amazing things you want to discuss with Tinkbox, don’t hesitate to contact us: Skip to main content.

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