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Suggest pagesPractical Electronics/IC/4012
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This page may need to be | 4012 | |
|---|---|
| Logic Type | Combinatorial |
| Function Family | Logic |
| Description | Dual 4-Input NAND Gate |
| Pins | 14 |
| Pinout | |
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| Functional Diagram | |
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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 infomation 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.
