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Digital ElectronicsDigital Interfaces

An open-collector logic output requires an external pull-up resistor mainly because the output stage can actively?

  • APull the line LOW but does not actively drive it HIGH
  • BDrive only HIGH and never LOW
  • CGenerate an analog sine wave
  • DStore a logic word
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Correct Answer: A. Pull the line LOW but does not actively drive it HIGH
Explanation: An open-collector output provides a transistor path to LOW when active. When inactive, the external pull-up resistor establishes the HIGH level.
Reference: Standard digital electronics: open-collector outputs
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