NOR
Inputs
| Pin | Type | Description |
|---|---|---|
| A | bit | First input signal |
| B | bit | Second input signal |
Outputs
| Pin | Type | Description |
|---|---|---|
| Q | bit | 1 only when A=0 and B=0 |
How It Works
NOR outputs 1 only when both inputs are 0. It is the negation of OR. Like NAND, it is a universal gate — all other logic functions can be built from NOR gates alone.
Truth Table
| A | B | Q |
|---|---|---|
| 0 | 0 | 1 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 0 |
Usage
Two NOR gates cross-connected form an RS latch, which is the foundation of Level 10 (SR Latch).