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SN74HC165: Logic Gate used in the SN74HC165 + behaviour at missing connection to the supply voltage or ground

Part Number: SN74HC165
Other Parts Discussed in Thread: SN74LVC1G74


I wanted to know what kind of logic gates are used in the shift Register SN74HC165. In the datasheet it looks like a RS Flipflop, but has an additional input for digital data. What is the exact name of this logic gate?

I also did some tests on the shift register and noticed, that if I seperate the connection to the supply voltage my Register still works without any malfunction. This also happens when I seperate the Connection to ground and the supply voltage is connected.

Can you help me out with this?

I also post my circuit here.