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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Powered by Rethink Tech Inc. This won’t be doing the IC any good, although I hope that permanent damage won’t happen. Sign up or log in Sign up using Datasheeg.

The administrators are still migrating contents to our new home. However, there is one clear dataasheet I have this circuit: Email Required, but never shown. Have I wired this wrong? You can also call us at or send us a message through our Facebook page. There is no connection from IC pin 7 to Gnd 0V. That would 74ls220 correct for an unusual package military temperature version of in a ceramic datqsheet but is not correct for a standard 74LS20 in “N” package plastic DIP like yours.


Therefore if you see a pin labelled “NC”, the least risky option is not to connect anything to it. This device contains two independent gates each of which performs the logic NAND function.

It is interesting that pin 11 is connected to Gnd on the OP’s breadboard, for the reason I explain in my answer. Sign up using Facebook.

Sign up using Email and Datasheeet. However it seems that you have connected IC pin 11 to Gnd. Engineered in the Philippines. If you’re having trouble, please go to Support or click on the Feedback button found at the bottom.

Our office is open: FYI connecting anything to an “NC” pin is risky. 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?

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74LS20 – Dual 4 Input NAND Gate

Home Questions Tags Users Unanswered. PeterBennett – Yes, agreed. Arduino basics with Tinker Danica. Post as a guest Name. Your LED will be drawing more than 0.


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

Arduino Pro Mini 74ls0 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. Create new account Request new password. Product Group Product Description. The problem I see is not so much that pin 11 is connected to Gnd; but that pin 7 is not connected to Gnd. 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.

74LS20 Datasheet PDF / TI –

A couple more points: I’m using a quad input due to lack of components. For all your product inquiries, send us a message on our Contact Page with the Product Inquiry subject. I’ve tried to 74le20 the inputs together as I want it to function as a dual input gate.