it has come to the time to put my electronics on a PCB, however I wish to make one addition, a connector block with debouncing so that switches can be put into the system at a later date connected to the interrupts...

my dillema is that the interrupts are falling edge triggered and the debouncing buffers I have found give outputs toggling low to high upon the press of a button, for example this maximchip. I assume that it would not work in the same way if i simply swapped the switch and the pull up resistor, due to the logic, or would it. (i just assume that the logic for the rsising edge of the outpu - debouncing the contacts closing, is not used in the same way for the contacts opening - falling edge of the output). Or can I use this method with a cleverly chosen switch?

so my first question is, am i correct in my above assumptions, and secondly is there a debounce IC out there that can be falling edge triggered (I would not like to invert my oputput, but I suppose if there is not other way I am going to have to!)

thanks for any advice you can give, or a magical IC that exists I have not found!