so here and there, ever so often, my 16f628 chips blow, and I have no idea why, tho I'm quite sure it's my own fault.

in the problamatic setup, I have 19 of them on small circuits, powering some ultrabright leds (x4) and sending a pulse to a counter chip to flash some other leds. some also send a pulse to a small motoer, but they are NOT driving the motor. it simply gets an ON pulse, and rotates once. (mac floppy eject... great little motors)
I'm feeding them a 5v power supply from a 200watt PC AT power supply, so it SHOULD be clean and perfect,...

what gives? one chip acctually fried and had burn marks all over (it was a micrchip sample, woudl that matter?)

it's artwork, so we're tlaking... maybe 2-4 blown chips everytime I do a week showing... it's a huge deal for selling the work, as I can't sell soemthing that pops and blows in 3 weeks....

I'm lost, any help from the more experienced is greatly desired..

thanks,
adam