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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Whereas in a “W” ceramic flat-pack package, the uses pin 11 as Gnd: Skip to main content. 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 dstasheet. 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.
Sign up or log in Sign up using Google. A couple more points: I wonder if there is a rogue datasheet somewhere which has mixed that unusual “W” package pinout, with the datashwet package pinout? However, there is one clear bug: Engineered in the Philippines.
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. Order Information Free shipping.
74LS20 datasheet, 74LS20 datasheets, manuals for 74LS20 electornic semiconductor part
The problem I see is not so much that pin 11 is connected to Gnd; but that pin 7 is not connected to Datasheey.
As already commented by John Da real schematic would daatasheet help readers. However it seems that you have connected IC pin 11 to Gnd. Please add that and re-test. Contact Infomation If you have any amazing things you want to discuss with Tinkbox, don’t hesitate to contact us: Your LED will be drawing more than 0.
74LS20 Dual 4-input NAND Gate
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.
Our office is open: Tinkbox is currently in beta mode. Therefore if you see a pin labelled “NC”, the least risky option is not to connect anything to it.
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Sign up using Email and Password. A real schematic rather than a photo of your breadboard might help you get an answer to your question.
74LS20 PIN CONFIGURATION datasheet & applicatoin notes – Datasheet Archive
I have this circuit: If you have any amazing things you want to discuss with Tinkbox, don’t hesitate to contact us:.
I’ve tried to pair the inputs together as I want it to function as a dual input gate. Popular Products Tinkduino Leo. You can also call us at or send us a message through our Facebook page. Search form Search this site. Email Required, but never shown. Have I wired this wrong? Create new account Request new password.
It is interesting that pin 11 is connected to Gnd on the OP’s breadboard, for the reason I explain in my answer. Other Services Custom Projects. Home Questions Tags Users Unanswered. There is no connection from IC pin 7 to Gnd 0V. FYI connecting anything to an “NC” pin is risky.
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