I'm using some CMOS chips (4021 shift bit register, CD74HCT164E serial in parrallel out, 4066 quad billateral switch, etc...)
I'll have some parts of the circuit on or off, but to economize maximum of I/O I try to group a maximum of "common pins". For example the LATCH pin of the 4021 as I will always latch before reading and I only need to read one register at the time, will just ".
Some parts of the circuit will stay off for a long time. I would like to know if I can unpower them but continue to send bits like on the LATCH pin of the 4021 without damaging them ? (Like adding a transistor on the +5V)