In a new design I am working on, I need a negative supply to provide a very rough reference to "invert" negative going low voltage logic. It has occured to me that there is a stealable source of -10V on the pins of my MAX202 ECPE chips. Are there any pitfalls, apart from the obvious don't try and run more than a couple of mA from it ? It'll be noisy as hell, but that doesn't really matter.

Steve