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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You can also call us at or send us a message through our Facebook page. Post as a guest Name. As already commented by John Da real schematic would definitely help readers.
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Full text of “IC Datasheet: 74LS20”
Your LED will be drawing more than 0. Some functions may be missing or not functioning. PeterBennett – Yes, agreed.
When I throw the switches to the up position, as pictured, the circuit is shorted to ground, which should pull the xatasheet pins low, meaning the output pin is high and the LED lights. Arduino basics with Tinker Danica.
FYI connecting anything to an “NC” pin is risky. Contact Infomation If you have any amazing things you want to discuss with Tinkbox, don’t hesitate to contact us: However it seems that you have connected IC pin 11 to Gnd.
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74LS20 Dual 4-input NAND Gate
Email Required, but never shown. Sign up using Email and Password. I’ve tried the same circuit with a couple of IC’s in case one was faulty, but the same behavior is exhibited. 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.
A real schematic rather than a photo of your breadboard might help you get an answer to your question. 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. Arduino Pro Mini Skip to main content. Sign up or log in Sign up using Google. I wonder if there is a rogue datasheet somewhere which has mixed that unusual “W” package pinout, with the “N” package pinout?
This won’t be doing the IC any good, although I hope that permanent damage won’t happen. You can place your order any day and time.
This device contains two independent gates each of which performs the logic NAND function. Peter – Absolutely agreed. That would be correct for an unusual package military temperature version of in a ceramic flat-pack but is not correct for a standard 74LS20 in “N” package plastic DIP like yours.
Popular Products Tinkduino Leo. Search form Search this site. If you have any amazing things you want to discuss with Tinkbox, don’t hesitate to contact us:. Please add that and re-test. I’ve tried to pair the inputs together as I want it to function as a dual input gate. I have this circuit: For all your product inquiries, send us a message on our Contact Page with the Product Inquiry subject.
The problem I see is not so much that pin 11 is connected to Gnd; but that pin 7 is not connected to Gnd. 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?
74LS20 Datasheet PDF / Motorola –
It is interesting that pin 11 is connected to Gnd on the OP’s breadboard, for the reason I explain in my answer. Therefore if you see a pin labelled “NC”, the least risky option is not to connect anything to it.
A couple more points: Whereas in a “W” ceramic flat-pack package, the uses pin 11 as Gnd: Product Group Product Description.