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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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Sign up using Facebook. 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. 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. The administrators are still migrating contents to our new home. Your LED will be drawing more than 0.

It is interesting that pin 11 is connected to Gnd on the OP’s breadboard, for the reason I explain in my answer. Some functions may be missing or not functioning.

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74LS20 Datasheet

74ks20 would be correct for an unusual package military dxtasheet version of in a ceramic flat-pack but is not correct for a standard 74LS20 in “N” package plastic DIP like yours. 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?

Pin 11 is a no-connect on the normal DIP package, so grounding that pin has no effect. I’ve tried the same circuit with a couple of IC’s in case one was faulty, but the same behavior is exhibited. I wonder if there is a rogue datasheet somewhere which has mixed that unusual datashheet package pinout, with the “N” package pinout?

Product Group Product Description. Please add that and re-test. When I throw the switches to the up position, as pictured, the circuit is shorted to ground, which should pull the input pins low, meaning the output pin is high and the LED lights.

A couple more points: Engineered in the Philippines.

Fairchild Semiconductor 74LS20 Series Datasheets. DM74LS20, 74LS20 Datasheet.

Therefore if you see a pin labelled “NC”, the least risky option is not to connect anything to it. Hopefully the OP can explain why they did datasneet. Peter – Absolutely agreed.

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Create new account Request new password. FYI connecting anything to an “NC” pin is risky. Our office is open: Uno R3 Arduino Comp If you have any amazing things you want to discuss with Tinkbox, don’t hesitate to contact us:.

Arduino Pro Mini A real schematic rather than a photo of your breadboard might help you get an answer to datahseet question. PeterBennett – Yes, agreed.

Powered by Rethink Tech Inc. I have this circuit: You can place your 7l4s20 any day and time. As already commented by John Da real schematic would definitely help readers. How to Make Learning More Fun? Have I wired this wrong? Other Services Custom Projects.