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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I wonder if there is a rogue datasheet somewhere which has mixed that unusual “W” package pinout, with the “N” package pinout?
This device contains two independent gates each of which performs the logic NAND function. I’ve tried to pair the inputs together as I want it to function as a dual input gate. datwsheet
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 IC | Jaycar US Site
Engineered in the Philippines. Peter – Absolutely agreed. I just couldn’t think of another reason why there is a Gnd connection on pin 11 – that was the only hypothesis 74ls02 could think of. Therefore if you see a pin labelled “NC”, the least risky option is not to connect anything to it.
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74LS20 datasheet, Pinout ,application circuits Dual 4-Input NAND Gate
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.
If you have any amazing things you want to discuss with Tinkbox, don’t hesitate to contact us:. A couple more points: As already commented by John Da real schematic would definitely help readers. Skip to main content. Uno R3 Arduino Comp Have I wired dstasheet wrong? Powered by Rethink Tech Inc. Tinkbox is currently in beta mode. FYI connecting anything to an “NC” pin is risky. Your LED will be drawing more than 0.
I’m using a quad input due to lack of components. You can place your order any day and time. I’ve tried the same circuit with a couple of IC’s in case one was faulty, but the same behavior is exhibited.
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Whereas in a “W” ceramic flat-pack package, the uses pin 11 as Gnd: It is interesting that pin 11 is connected to Gnd on the OP’s breadboard, dqtasheet the reason I explain in my answer. Sign up using Facebook. Mega R3 Arduin However it seems that you have connected IC pin 11 to Gnd. This won’t be doing the IC any good, although I hope that permanent damage won’t happen. The problem I see is not so much that pin 11 is connected to Gnd; but that pin 7 is not connected to Gnd.
Datqsheet – Yes, agreed. Sign up or log in Sign up using Google. When I datashwet 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. The fact that at least some datasheets like datadheet 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?
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If you’re having trouble, please go to Support or click on the Feedback button found at the bottom. I have this circuit: Hopefully the OP can explain why they did this.