I am using a "CD74HC4051 High-speed cmos logic analog multiplexer/demultiplexer"
I put 5V to VCC, put my oscilloscope probe to the common out/in, put 3.3V to A1 (channel in/out), and have a wire holding 3.3V ready to plug into S0 (address select) so that I can activate A1 from on to off state easily. I expect the oscilloscope to either give me a 3.3V or 0V output depending on whether or not S0 gets a voltage (according to the truth table, S0 on high activates A1).
However when I power the circuit, the oscilloscope outputs what appears as pulses. The oscilloscope also states "Square wave or pulse detected on CH1". When I put 3.3V to S0, another output appears but it's still a noisey square wave.
Any ideas as to why I'm getting such strange outputs? I'm not exceeding the voltage range so I don't think my device is blown?
I noticed the device has a VEE input, should I be putting a voltage here?