Multiple choice

TTL with which output can be used for wired connection?

  1. Totem pole output

  2. Open collector output

  3. Active pull up

  4. Schottky TTL
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Open collector output TTL can be used for wired-AND (also called wired-OR for negative logic) connections. Multiple open collector outputs can be connected together with a single external pull-up resistor, implementing the AND function. Totem pole outputs cannot be wired together due to potential short circuits.

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