HD14008B – 4-Bit Binary Full Adder
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) |
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.
It’s made out of logic gates, like this:
| Carry-In | A | B | Sum (S) | Carry Out |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 1 | 0 |
| 0 | 0 | 1 | 1 | 0 |
| 0 | 1 | 1 | 0 | 1 |
| 1 | 0 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 | 1 |
| 1 | 0 | 1 | 0 | 1 |
| 1 | 1 | 1 | 1 | 1 |
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