The HD14008B is a CMOS chip that can add two 4-bit binary numbers. The result is given right away as a 5-bit number. It is called a 4-bit Full Adder.
Pin Overview
Pin Name
Pin #
Type
Description
VDD
16
Power
Supply Voltage (+3 to +15V)
GND
8
Power
Ground (0V)
A0 to A3
7, 5, 3, 1
Input
Bits 0 to 3 for input number A
B0 to B3
6, 4, 2, 15
Input
Bits 0 to 3 for input number B
CIN
9
Input
Carry-In bit
S0 to S3
10, 11, 12, 13
Output
Bits 0 to 3 for output sum S
COUT
14
Output
Carry Out bit (Bit 4 of S)
Pin overview for the 4008 IC
What is a Full Adder?
An adder is a circuit that adds two binary numbers. An adder is either a half adder or a full adder. The difference is that the full adder also has a Carry-In bit, while the half adder does not.
