[Irish_Thatcherite]

I never knew that CMOS devices were that sensitive!

[sionnsar]

I never knew that CMOS devices were that sensitive!

The older ones were. My guess is that both a pullup and pulldown transistor got switched on simultaneously -- as I recall that forms a switched-on SCR; the only way to turn it off is to remove power (or wait until it melts into slag, which is what my device did).