Digital Logic Fundamentals Unit 4 – Open Collector and Other TTL Gates
Exercise 1 – DC Operation of a NOT and an OR-TIE
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to demonstrate the operation of NOT
and OR-TIE functions. You will verify your results by measuring circuit logic states.
EXERCISE DISCUSSION
- A NOT gate complements a logic state.
- Open collector gates require a pull-up circuit.
- In its low state, the output of a gate will sink current.
- Two or more open collector gates with their outputs connected together perform an OR-TIE
operation. - OR-TIE connections require the use of open collector gates.