CD4001 – an IC with four NOR Gates
The CD4001 is a CMOS chip with four NOR gates. Because each gate has two inputs and it has four gates inside, it’s usually called a Quad 2-Input NOR Gate.
A NOR gate combines the functionality of OR and NOT gates. It gives a HIGH output only when both inputs are LOW; otherwise, the output is LOW.
Pin Overview
| Pin Name | Pin # | Type | Description |
|---|---|---|---|
| VDD | 14 | Power | Supply Voltage (+3 to +15V) |
| GND | 7 | Power | Ground (0V) |
| A1 to A4 | 1, 5, 8, 12 | Input | Inputs A of the four NOR gates |
| B1 to B4 | 2, 6, 9, 13 | Input | Inputs B of the four NOR gates |
| Q1 to Q4 | 3, 4, 10, 11 | Output | Outputs from the four NOR gates |
What is a NOR gate?
A NOR gate is a logic gate that combines the functionality of both an OR and a NOT gate. It’s often called NOT-OR because it’s the same as an OR gate with a NOT gate on the output.
Simply put, a NOR gate gives a HIGH output only when all the inputs are LOW as shown in the truth table below. Therefore, if you input a HIGH in any of the inputs, the result will automatically become LOW since the results of the OR gate are inverted by the NOT gate.
| Input A | Input B | Output Q |
|---|---|---|
| 0 | 0 | 1 |
| 1 | 0 | 0 |
| 0 | 1 | 0 |
| 1 | 1 | 0 |
NOR gates are basic logic gates that can be used for a lot of different logical operations. You’ll often see NOR gates in the construction of flip-flops and latches.
Technical Specifications
| Physical | |
| Case/Package | DIP |
| Mount | Through Hole |
| Number of Pins | 14 |
| Technical | |
| High Level Output Current | -4.2 mA |
| Logic Function | NOR |
| Low Level Output Current | 4.2 mA |
| Max Operating Temperature | 125 °C |
| Max Supply Voltage | 15 V |
| Min Operating Temperature | -55 °C |
| Min Supply Voltage | 3 V |
| Number of Circuits | 4 |
| Number of Elements | 4 |
| Number of Gates | 4 |
| Number of Inputs | 2 |
| Number of Outputs | 1 |
| Output Current | 8.8 mA |
| Propagation Delay | 250 ns |
| Quiescent Current | 1 µA |
| Turn-On Delay Time | 250 ns |
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