4. Logic Gates and Related Devices - Part B
Universal gates like NAND and NOR can construct any boolean logic expression by combining themselves, which offers great flexibility in circuit design. Gates with open collector or drain outputs allow for specific logic functions using external resistors, while tristate logic gates enable shared bus communications via an ENABLE input. Other gate types, such as AND-OR-INVERT and Schmitt gates, exhibit unique attributes for various applications in digital electronics.
Sections
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What we have learnt
- NAND and NOR gates are universal gates suitable for implementing any boolean function.
- Open collector and open drain outputs utilize pull-up resistors to create specific logic operations.
- Tristate logic gates can connect multiple outputs to a common bus while ensuring only one is active at any time.
- Hysteresis in Schmitt gates improves noise immunity in applications with variable inputs.
Key Concepts
- -- Universal Gates
- Logic gates that can create any possible logical function; NAND and NOR gates are examples.
- -- Open Collector/Open Drain Outputs
- Output configurations that connect external resistors for logic operations, useful for ANDing operations.
- -- Tristate Logic Gates
- Gates with three output states: logic '1', logic '0', and high impedance, allowing bus communication.
- -- Schmitt Gates
- Logic gates that employ hysteresis, utilizing two threshold voltages to enhance noise immunity in fluctuating signals.
Additional Learning Materials
Supplementary resources to enhance your learning experience.