Time to charge a capacitor?

[Ratch]

Is the time to charge a capacitor literally 5 times tor? And tor is equal to RC.


I am getting a value of 200us for the rise time of an driver input with a capacitance of about 8pF and approximately 5M ohms. Values are taken from the datasheet.

I've seen the rise time of this on an oscilloscope significantly quicker than this?

When you "charge" a capacitor, what are you charging it with?

Ratch