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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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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.

Whereas in a “W” ceramic flat-pack package, the uses pin 11 as Gnd: 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.

I’m using a quad input due to lack of components. Peter – Absolutely agreed. Post as a guest Name.

74LS20 Dual 4-Input NAND IC | Tinkbox

As already commented by John Da real schematic would definitely help readers. This device contains two independent gates each of which performs the logic NAND function. Contact Infomation If you have any amazing things dtasheet want to discuss with Tinkbox, don’t hesitate to contact us: Hopefully the OP can explain why they did this.

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Skip to main content. Order Information Free shipping. Home Questions Tags Users Unanswered. Product Group Product Description. FYI connecting anything to an “NC” pin is risky. How to Make Learning More Fun? PeterBennett – Yes, agreed.

74LS20 – Dual 4 Input NAND Gate

However, there is one clear bug: I have this circuit: 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? Powered by Rethink Tech Inc. Popular Products Tinkduino Leo.

Post Your Answer Discard 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. 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.

Arduino basics with Tinker Danica. The problem I see is not so much that pin 11 is connected to Gnd; but that pin 7 is not connected to Gnd. Pin 11 is a no-connect on the normal DIP package, so grounding that pin has no effect.

However it seems that you have connected IC pin 11 to Gnd. 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. Have I wired this wrong?

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A real schematic rather than a photo of your breadboard might help you get an answer to your question. I’ve tried the same circuit with a couple of IC’s in case one was faulty, but the same behavior is exhibited.

IC Datasheet: 74LS20

A couple more points: Tinkbox is currently in beta mode. Some functions may be missing or not functioning.

Other Services Custom Projects. 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?

There is no connection from IC pin 7 to Gnd 0V. Sign up using Facebook. For all your product inquiries, send us a message on our Contact Page with the Product Inquiry subject.

Email Required, but never shown. Arduino Pro Mini I just couldn’t think of another reason why there is a Dtaasheet connection on pin 11 – that was the only hypothesis I could think of.