The CD4073 is a CMOS chip with three 3-input AND gates. Because each gate has three inputs and it has three gates inside, it’s usually called a Triple 3-Input AND Gate.
An AND gate is a basic logic gate that checks if all its inputs are HIGH. So the output from a 3-input AND gate will only be HIGH if all three inputs are HIGH.
Pin Overview
| PIN NAME | PIN # | TYPE | DESCRIPTION |
|---|---|---|---|
| VDD | 14 | Power | Supply Voltage (+3 to +15V) |
| GND | 7 | Power | Ground (0V) |
| A1 to A3 | 1, 3, 13 | Input | Inputs A of the three AND gates |
| B1 to B3 | 2, 4, 12 | Input | Inputs B of the three AND gates |
| C1 to C3 | 5, 8, 11 | Input | Inputs C of the three AND gates |
| Q1 to Q3 | 6, 9, 10 | Output | Outputs from the three AND gates |
What is a 3-input AND gate?
An AND gate with three inputs will only give out HIGH if all inputs are HIGH (input 1 AND input 2 AND input 3). You can see the truth table below.
| INPUT A | INPUT B | INPUT C | OUTPUT Q |
|---|---|---|---|
| 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 0 |
| 0 | 1 | 1 | 0 |
| 1 | 0 | 0 | 0 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 |
| 1 | 1 | 1 | 1 |
How To Use the CD4073?
First of all, you need a power supply voltage of 3 to 15V. Some versions of the chip support up to 20V. Check the datasheet of your version of the chip for exact values.
To be able to use any of the AND gates in the chip, you need to first connect the VDD pin to the positive supply terminal and the GND pin to the negative supply terminal.
The A, B, and C pins are the inputs to the three AND gates in the IC.
The Q pins are the outputs from the AND gates.
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