I'm trying to cut power to the chip to "disable" all outputs without needing to know the input values or changing them. What happens if I use a NPN transistor to let the GND pin float and pull it to GND if the transistor switches on? Would that work? I'm trying to use a npn because my circuit has one unused channel in an ULN2003 and I'm trying to reduce my component count.
Electronic – 74 Series Logic Power switching with Gnd? (74Hc86)
digital-logicpower
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Best Answer
The inputs to the chip will remain active and more than likely any "low" inputs will "power" the ground of the 74HC86 via protection diodes on the inputs. I don't think it will work.