I need to know if you always need to ground all unused inputs on an IC? I am using a 4011 and am not using all the inputs. Thanks...

 

Connect all unused inputs of a 4011 to Vcc.

 

All unused inputs for a CMOS IC need to have a current path to ground or Vdd. They can be connected directly, via a resistor, etc - but if they are left disconnected, they can oscillate at unpredictable frequencies, causing strange problems.

Unused OUTPUTS should be left disconnected.

 

Typically the datasheets will recommend treatment of unused pins.

 

Typically the datasheets will recommend treatment of unused pins.

This is not generally the case for 4000 series CMOS.
They usually don't mention the bypass capacitor requirement either.

 

While I use your idea of a bypass capacitor for every IC, the "CMOS Cookbook" says to use one capacitor for every six IC's.

 

Thanks guys. Thats what I thought but just wanted to make sure so I didn't cook something....