Inputs should not be pushed more than 0.5 V above
VDD or below VEE.
For input voltage level specifications for control inputs, see
VIH and VIL in Electrical Characteristics.
Recommended Output Conditions:
Outputs should not be pulled above VDD
or below VEE.
Input or output current consideration:
The CD405xB series of parts do not have
internal current drive circuitry and thus cannot
sink or source current. Any current will be passed
through the device.