Digital Electronics - Logic Families and Their Characteristics - Discussion
Discussion Forum : Logic Families and Their Characteristics - General Questions (Q.No. 5)
5.
What should be done to unused inputs on TTL gates?
They should be left disconnected so as not to produce a load on any of the other circuits and to minimize power loading on the voltage source.
All unused gates should be connected together and tied to V through a 1 k
resistor.
resistor.All unused inputs should be connected to an unused output; this will ensure compatible loading on both the unused inputs and unused outputs.
Unused AND and NAND inputs should be tied to VCC through a 1 k resistor; unused OR and NOR inputs should be grounded.
resistor; unused OR and NOR inputs should be grounded.Discussion:
1 comments Page 1 of 1.
Emmanuel said:
1 decade ago
Why? I thought for AND gates a pull up resistor is needed.
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