This 14-pin DIP chip contains four separate NAND gates that operate according to this truth table:
| Input A | Input B | Output |
|---|---|---|
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
In a nutshell, when both inputs are high, then the result is low, else high - the exact opposite of an AND gate. NAND gates can be used for a variety of use cases, including inverting logic signals, or debouncing mechanical push buttons.
In contrast to simpler NAND gates like the CD4011, the CD4093 contains Schmitt Triggers for handling noisy input signals: if the input signal is not clearly a high or low voltage but rather inbetween, the hysteresis of the Schmitt Trigger prevents unwanted oscillations and keeps the signal stable.
While the added Schmitt Triggers are typically no benefit in digital circuits, they don’t hurt either.
Materials
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(content created Aug 28, 2024)