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# ALTERNATIVE LOGIC GATES

CONTENT

1. Truth table construction for: NAND, NOR
2. Equation for NAND, NOR, Gates
3. Uses of Logic Gates (i) As Building Blocks for Hardware/Electronic Components, etc.
4. Construction of Simple Comparator.

## Truth Table Construction for NAND

Two inputs NAND gate.

The Boolean expression is $$\overline{A.B} = Q$$

## Truth Table Construction for NOR

Two inputs NOR gate.

The Boolean expression is $$\overline{A+B} = Q$$

## Uses of Logic Gates

(i) Logic gates are used as elementary blocks for devices where signals needed to be selected or assembled in a controlled form. This application is evident in telephone switching, satellite transmission and digital computer operations.

(ii) They can be used in making comparators.

(iii) They are used in the design of transistors, resistors and capacitors.

(iv) Logic circuits are used in integrated circuits, vacuum tube, amplifier, circuit boards and oscillator circuit.

(v) Resistor-Transistor Logic (RTL) and emitter coupled logic (ECL) are used in production of a very high speed CPU.

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