This is a practical circuit example that you can build using a CD4008 IC. What better way to show how a binary adder works than to, well, add two binary numbers! The C OUT pin is the output for the 5th bit of the sum S (or the Carry Out bit).Ĥ008 Pinout Example Circuit: Adding Numbers With Switches The S0 to S3 pins are the outputs for the 4 bits of the sum S. It’s only used if you are combining several adders. The C IN pin is the input for a Carry-In bit. The B0 to B3 pins are the inputs for the 4 bits of number B. The A0 to A3 pins are the inputs for the 4 bits of number A. Check the datasheet of your version of the chip for exact values. Some versions of the chip support up to 20V. You can use a power supply voltage of anywhere from 3V to 15V. To be able to use the Full Adder in the chip, you must first connect the VDD pin and GND pin to the power supply. Truth Table for the Full Adder How To Use the CD4008 It’s made out of logic gates, like this: A Full Adder Carry-In The difference is that the full adder also has a Carry-In bit, while the half adder does not. An adder is either a half adder or a full adder. Pin overview for the 4008 IC What is a Full Adder?Īn adder is a circuit that adds two binary numbers. The result is given right away as a 5-bit number. The CD4008 is a CMOS chip that can add two 4-bit binary numbers.
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