Digital Electronics Series
NOR Gate: Universal Logic
Logic Operation, Truth Table & Memory Applications
Live NOR Logic Simulator
Input A
Input B
Output Y
1
Click the inputs A and B to see the logic gate react in real-time!
The NOR gate is a fundamental gate that produces a HIGH output only when both inputs are LOW. Like the NAND gate, it is universal, meaning any complex digital system can be built using only NOR gates.
01 Truth Table (2-Input)
| Input A | Input B | Output Y |
|---|---|---|
| 0 | 0 | 1 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 0 |
Boolean Expression
Y = \overline{A + B}
Industrial Applications
SR Latches
A pair of cross-coupled NOR gates forms the basic bit storage element for memory.
Control Logic
Used in state machines where a “no action” state is the default safe condition.
Memory Circuits
Found in NOR Flash memory, allowing fast random access to data stored.