Electrical Engineering › Section S · Logic gates and Boolean algebra › Topic S.1
Inverter, AND, OR, NAND, NOR, and XOR gates
Six kinds of gate, plus the XNOR, are the building blocks of all digital hardware. This topic gives each one's symbol, Boolean expression and truth table, shows how to work out gate outputs from timing waveforms, and introduces active-LOW signals and the equivalent forms of NAND and NOR.
In this topic
- Symbols, bubbles and active-LOW signals
- The inverter
- AND and OR gates with many inputs
- Worked example: AND as an enable gate
- The NAND gate
- The NOR gate
- Worked example: an active-LOW door warning
- XOR and XNOR
- All six two-input functions
- Worked example: outputs from waveforms
- Common mistakes to avoid
- Key takeaways
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