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SN74LS07: SN74LS07 description

Part Number: SN74LS07
Other Parts Discussed in Thread: SN74AHCT04,

i had designed an H bridge PCB design. but my current question is on the buffer. is it necessary to connect all the unused pin to the ground? what will happen if I will not connect the unused to the ground?

i am also getting some biased voltage across the output pin.