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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Create new account Request new password. There is no connection from IC pin 7 to Gnd 0V. Our office is open: For all your product inquiries, send us a message on our Contact Page with the Product Inquiry subject. Mega R3 Arduin Skip to main content. Other Services Custom Projects. As already commented by John Da real schematic would definitely help readers.

Search Results for 74LS20 : 2 documents found

I wonder if there is a rogue datasheet somewhere which has mixed that unusual “W” package pinout, with the “N” package pinout? 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.

I have this circuit: PeterBennett – Yes, agreed. The administrators are still migrating contents to our new home.

Sign up or log in Sign up using Google. Please add that and re-test. This won’t be doing the IC any good, although I hope that permanent damage won’t happen. Uno R3 Arduino Comp Email Required, but never shown. Search form Search this site.


Engineered in the Philippines. However, there is one clear bug: FYI connecting anything to an “NC” pin is risky. That would be correct for an unusual package military temperature version of in a ceramic flat-pack but is not correct datashewt a standard 74LS20 in “N” package plastic DIP like yours. A couple more points: Pin 11 is a no-connect on the normal Daatasheet package, so grounding that pin has no effect.

74LS20 Dual 4-input NAND Gate

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Arduino basics with Tinker Danica. This device contains two independent gates each of which performs the logic NAND function.

74LS20 Dual 4-input NAND Gate IC | Jaycar US Site

Tinkbox is currently in beta mode. 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. You can place your order any day and time. Therefore if you see a pin labelled “NC”, the least risky option is not to connect anything to it. Post as a guest Name. 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.

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? Sign up using Email and Password. Sign up using Facebook.

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74LS20 datasheet, Pinout ,application circuits Dual 4-Input NAND Gate

I’ve tried to pair the inputs together as I want it to function as a dual input gate. Home Questions Tags Users Unanswered.

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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? Popular Products Tinkduino Leo. How to Make Learning More Fun?

Hopefully the OP can explain why they did this. The problem I see is not so much that pin 11 is connected to Gnd; but that dataheet 7 is not connected to Gnd.

Your LED will be drawing more than 0. Arduino Pro Mini It is interesting that pin 11 is connected to Gnd on the OP’s breadboard, for the reason I explain in my answer. I’m using a quad input due to lack of components. Have I wired this wrong? However it seems that you have connected IC pin 11 to Gnd. Contact Infomation If you have any amazing things you want to discuss with Tinkbox, don’t hesitate to contact us: