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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When I throw the switches to the up datxsheet, 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 real schematic rather than a photo of your breadboard might help you get an answer to your question. Search form Search this site. As already commented by John Da real schematic would definitely help readers.

However, there is one clear bug: Home Questions Tags Users Unanswered. 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. I wonder if there is a rogue datasheet somewhere which has mixed that unusual “W” package pinout, with the “N” package pinout?

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74LS20 Dual 4-Input NAND IC | Tinkbox

Whereas in a “W” ceramic flat-pack package, the uses pin 11 as Gnd: There is no connection from IC pin 7 to Gnd 0V.

Engineered in the Philippines. This device contains two independent gates each of which performs the logic NAND function. Some functions may be missing or not functioning. Tinkbox is currently in beta mode.

74LS20 Datasheet PDF – Hitachi Semiconductor

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. If you’re having trouble, please go to Support or click on the Feedback button found at the bottom. Sign up using Facebook. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Your LED will be drawing more than 0.

IC Datasheet: 74LS20

This won’t be doing the IC any good, although I hope that permanent damage won’t happen. Please add that and re-test. Product 774ls20 Product Description.

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Hopefully the OP can explain why they did this. A couple more points: Peter – Absolutely agreed. Powered by Ratasheet Tech Inc. Sign up using Email and Password.

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 datashdet, while wiring the breadboard? For all your datzsheet inquiries, send us a message on our Contact Page with the Product Inquiry subject.

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74LS20 Datasheet – NAND Gates –

I’ve tried to pair the inputs together as I want it to function as a dual input gate. FYI connecting anything to an “NC” pin is risky. However it seems that you have connected IC pin 11 to Gnd. Have I wired this wrong?

You can place your order any day and time. PeterBennett – Yes, agreed. Uno R3 Arduino Comp