< Practical Electronics < IC
| 4012 | |
|---|---|
| Logic Type | Combinatorial |
| Function Family | Logic |
| Description | Dual 4-Input NAND Gate |
| Pins | 14 |
| Pinout | |
 | |
| Functional Diagram | |
 | |
The 4012 is a member of the 4000 Series CMOS range, and contains two independent NAND gates, each with four inputs. The pinout diagram, given on the right, is the standard four-input CMOS logic gate IC layout:
- Pin 7 is the ground supply (GND)
- Pin 14 is the positive supply (VDD)
- Pins 2-5 and 9-12 are gate inputs for the two gates
- Pin 1 and 13 are gate outputs
- Pin 6 and 8 are not connected
The truth table for one of the two gates is shown below. For more information about the NAND gate in general, see this module.
Truth Table for a Single Gate
| A | B | C | D | Q | |
|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 1 | |
| 0 | 0 | 0 | 1 | 1 | |
| 0 | 0 | 1 | 0 | 1 | |
| 0 | 0 | 1 | 1 | 1 | |
| 0 | 1 | 0 | 0 | 1 | |
| 0 | 1 | 0 | 1 | 1 | |
| 0 | 1 | 1 | 0 | 1 | |
| 0 | 1 | 1 | 1 | 1 | |
| 1 | 0 | 0 | 0 | 1 | |
| 1 | 0 | 0 | 1 | 1 | |
| 1 | 0 | 1 | 0 | 1 | |
| 1 | 0 | 1 | 1 | 1 | |
| 1 | 1 | 0 | 0 | 1 | |
| 1 | 1 | 0 | 1 | 1 | |
| 1 | 1 | 1 | 0 | 1 | |
| 1 | 1 | 1 | 1 | 0 |
This chip is widely available, and usually comes in a DIL-14 or SOIC-14 package.
This chip is different in pinout to the TTL 7420, but can fulfill its function if the wiring is modified.
This article is issued from
Wikibooks.
The text is licensed under Creative
Commons - Attribution - Sharealike.
Additional terms may apply for the media files.