These full adders perform the addition of two 4-bit binary numbers. The sum (∑) outputs are provided for each bit and the resultant carry (C4) is obtained from. 74LS83 Datasheet, 74LS83 PDF, 74LS83 Data sheet, 74LS83 manual, IC LS SERIES, 4-BIT ADDER/SUBTRACTOR, PDIP16, Arithmetic Circuit, unknown. 74LS83 datasheet, 74LS83 circuit, 74LS83 data sheet: MOTOROLA – 4-BIT for Electronic Components and Semiconductors, integrated circuits, diodes, triacs.

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The setup I am using and the problems I am having are described below. I attached a picture of the setup and included a link to the Motorola 74LS83A data sheet. Any explanations, hopefully at a very fundamental level, would be appreciated.

I used a multimeter to verify that all the power rails have power. I used two 4-bit Dip Switches left for A input and right for B input which were inserted into the E and E breadboard positions, respectively, and terminate on the F and F positions, respectively. I used a multimeter to verify continuity when the DIP switches are in the closed positions. Pin13 C0 pinout is connected to the negative power rail with a black wire, as there is no carry-in kc. A Power Supply powers the circuits.

The Power Supply delivers a constant voltage of 4V and maximum amperage of. I am not currently using an IC carrier to mount datashedt IC onto the breadboard. This was ordered; however it will not be received from China for another weeks.

However, a multimeter continuity test verifies a good connection for each of the 16 IC pins to the breadboard. I have not used anti-static wrist straps. There is no amperage when measuring current going into any of the input A or B pins of the IC. I have ordered two batches of 74LS83A and the results are the same. A picture of the setup is attached.

74LS83 4-bit Binary Full Adder IC | Tinkbox

A pdf file of the 74LS83A is attached. A link to the Motorola data sheet for the 74LS83A is below: Can you see any reason why I am getting incorrect results i. Can you suggest any way I can dahasheet test the IC with just a multimeter? I do not have access to an automated IC test system? These are my 74ls38 I think what is happening is the inputs to the ICs are permanently high.

If they are not actively pulled to logic low state, they internally assume the input is high. The ICs are assuming their inputs are ‘1’ all the time and operating the switch is just providing a few microamps more to reinforce the ‘1’ state. Try wiring the inputs like this: You might be able to re-use those 10K resistors in place of 4. Let me know if that works. It’s better to share your questions and answers on Edaboard so we can all benefit from each others experiences.


Originally Posted by BradtheRad. Your adder circuit is an excellent demonstration tool for this. Did find the list of datasheets for 74LS There is the 1-bit 74le83 circuit, of course, if you want a basic circuit which will give you less trouble.

Guess you’ll need different IC’s to demonstrate it, however. It is wired as you described but unfortunately that is wrong!

Wire as I suggested earlier and it should work fine. That will ensure the voltages at the logic inputs to the IC meet the required levels datashedt it to recognize. Also reduce the value of the resistors in series with the LEDs to 1K so they can pass more current. There is plenty of spare current capacity at the output of the IC so there is no need to be so restictive and it will make them much easier to see. Even with 1K resistors they will only pass a meagre 3mA at most. Alternatively you could use 74C or 74HC families instead.

I tried to keep it simple by using positive logic as it is a training aid but as FvM rightly points out, in a producton design it would be normal to to do it the other way around. See the picture of the datahseet which is attached. I place small squares of paper between each of the 4. The only thing that has me concerned is, when the Dip switches are open, I get continuity between all the input circuits.

I think this is because all the resistors have a common ground. The results are not as expected. Any idea what is happening? Any other ideas on how I datsaheet get accurate addition results? I show the results in the table below. Don’t forget that in a real computational circuit the inputs would actively be driven by other devices, here you are trying to simulate them with resistors and switches.

Try changing the 4. You should never test for continuity between inputs – at least not with a normal continuity tester as they pass enough current to damage the IC. Instead, measure the voltage at the input pins, it should be 5V if the dstasheet is closed and almost 0V when the switch is open.

Ratasheet careful though, if an input is not connected, it may appear to have low voltage on it when measured but still be ‘seen’ vatasheet insde the IC as being high, you actually have to draw current from the pin to be sure it really is logic low. In the test circuit they use 0. Supposing that current, the voltage drop at 4k7 is 3. I recall seeing 1k suggested, but I’d rather you look it up. TI has documents on how to use each family, look it up. Remember that at board level everything is analog, digital is just a convenient representation.


I replace the 4. Thank you all for your help! The overall polarity seems to be different and they drift to a “high” output. In simple terms that I can understand and explain to the kids, what are the main differences between the two systems?

TTL uses a special kind of transistor with multiple emitters which can’t be replicated with discretes. What you’re doing with discretes is likely to be RTL, and a floating unconnected base will be read as 0.

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