1. Why might an open-collector device be used in preference to a totem-pole output device?
2. What is meant by a three-state output gate?
3. A four-input TTL NAND gate is to be used in an application that requires a threeinput gate. What should be done to the unused input in this circuit?
4. A four-input TTL NOR gate is to be used in an application that requires a threeinput gate. What should be done to the unused input in this circuit?
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