4081 – An IC With Four AND Gates
The 4081 is a CMOS chip with four AND gates. An AND gate is a logic gate that gives a HIGH output only when all its inputs are HIGH.
This particular Integrated Circuit (IC) has four AND gates and each gate has two inputs. Therefore it’s often called a Quad 2-Input AND Gate.
CD4081 IC Pinout Description
| Pin Number | Pin Name | Pin Description |
| 14 | VDD | Supply voltage input, 5V to 15V |
| 7 | VSS | Ground reference |
| 1, 2 | INPUT | AND gate one inputs |
| 3 | OUTPUT | AND gate one output |
| 5, 6 | INPUT | AND gate two inputs |
| 4 | OUTPUT | AND gate two output |
| 8, 9 | INPUT | AND gate three inputs |
| 10 | OUTPUT | AND gate three output |
| 12, 13 | INPUT | AND gate four inputs |
| 11 | OUTPUT | AND gate four output |
Features
- Four two-input AND gates in one package
- Wide supply range – 5V to 15V typical
- 700mW power dissipation
- Symmetrical output characteristics
- Maximum input leakage 1 µA at 15V over a full temperature range
- Available in the DIP-14 package
Note: Complete technical details about this IC can be found in the CD4081 datasheet, linked at the end of the page.
What is an AND gate?
An AND gate is one of the basic logic gates. It can have two or more inputs. It gives a HIGH output only when all of these inputs are HIGH. The basic AND gate has two inputs and you can see its symbol and truth table below.
| Input A | Input B | Output Q |
| 0 | 0 | 0 |
| 1 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 1 | 1 |
Applications
- Logic buffers, inverters, and decoders
- Implementing logic circuits
- Signal conditioning
