I have a datasheet of a CD74HCT86E XOR gate. Under Absolute Maximum Ratings, it says
DC Output Source or Sink Current per Output Pin, IO
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±25mA
How should I interpret this? I'm thinking of two options:
Make sure that the sink or source current never exceeds 25mA. However, then I'm wondering why there are specifications on the output voltage: I should think these voltages follow from the current draw and the output impedance - you can't have a current independent of output pin voltage
Make sure VO never goes below -0.5V or above Vcc+0.5V. As long as this is the case, the device will not source or sink more than 25mA. Do not exceed these voltages, or the device will sink/source more than 25mA, and magic smoke will happen.
Which is it?