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How to build a half-/full binary adder?

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waffle_kid

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I am attempting to build a binary adder for math class.....however, i have absolutely no idea what i'm doing.

i need to buy various gates, but don't know which specific ones to get (as in, what is the difference between an IC,SN74AHCOOD,SOIC-14 Quad 2-input NAND gate and an IC,74AHCOO,SOIC-14 Quad 2-input NAND gate, and does it even make a difference). i went to jameco.com and was inundated by products with various numbers and letters that meant nothing to me.

i want to make a full adder. hell, even a half-adder will do. i am a rank amateur, so i need quite a bit of help.

if anyone could give some advice, i would greatly appreciate it. if i sound like a fool, well, i can't help it. we all have to start somewhere.
 

build 4 bit adder with nand

Hello,
SOIC-14 tells the package type is SOIC (Small Outline Plastic Package). You need to look at the size and type of package since when you get the IC you need to solder it. So if you don't have very good soldering equipment or you want to do a breadboard testing of your adder first, you need to order a DIP(Dual In line package). 14 is just the number of pins in the package.
For your project you don't need to worry about the letters in the middle like 74AHC00 all you need is any 7400 IC to get a NAND gate. But make sure they are not open collector types otherwise you will need some external resistors.
Quad 2 input NAND gate means that this IC has 4 gates(Quad) and each gate has 2 inputs and 1 output. So 7400 has 4 2 input NAND gates, which you can use.
Best way to go about your project is to make the Gate level diagram, which you must already be having. Reduce the number of gates as much as possible. The look at the ICs available. Sometimes, since like this 7400 has 4 NAND gates and probably you won't be needing all 4 of them, you can modify the circuit in such a way so as to use these extra gates instead of adding another IC. Just connect the gates and you should be fine. Look at the IC datasheets for the Gate connections within the IC.
 


Re: Binary Adder

Yeah you should be more specific about your project. You need to build onley one bit addir using basic gates like NAND. Or you are allowed to use XOR gates as well. As was pointed out earlier there exit 4 bit adders as well. Tham neans you have nothing to do just buy the chip and solder the supply and inputs/outputs. A half adder can be made only with one XOR gate, so here again you do not have much to do. Regarding those letters and numbers are only for identifying the circuit. From the datasheet you can find out the power supply, type of gate (functionality) included, speed (the rising/falling edge of the signals - or the highest frequency at which operates). the type of package, operating temperature and so on.

Belsugului
 

Binary Adder

A quick and easy way to build simple digital logic is to buy a solderless breadboard like this:
https://www.circuitspecialists.com/level.itml/icOid/6884

If you want to experiment with gates and flip-flops, then buy some friendly HCT family chips (high speed CMOS with TTL compatible inputs) in plastic DIP packages. Maybe 74HCT00, 74HCT02, 74HCT04, 74HCT08, 74HCT14, 74HCT32, 74HCT74, 74HCT86, and whatever else sounds interesting. For example, the Texas Instruments part number is SN74HCT00N. Grab a few 555 timers too - they are fun. You can download the manufacturer data books and application notes to learn all the technical info about those parts, and also learn the details of their part numbers. The data sheets may seem overwhelming at first, but it will all make sense eventually.

You'll also need a small 5V power supply. While you are shopping, grab a few pushbuttons, switches, LEDs, and a small assortment of resistors (1/4 watt) and capacitors.

Have fun!
 

Re: Binary Adder

wow, thank you very much. all your advice was quite helpful. i'll try to let you know how everything turns out.
 

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