Semiconductors are very sensitive to ESD and surge.
Especially, FPGAs are manufactured with very fine processing technology and very vulnerable to ESD.
In our FPGA boards, FPGA I/O pins are connected to board's pads and connectors directly. When you use our FPGA boards, please be careful like as you touch bare FPGA device.
In some cases, ground voltage between not-grounded-each-other equipments is observed 100V or more.
There are cased where parallel ports and USB ports are destroyed when it attached by connectors.
Have you seen that your FPGA boards or microcomputers have a glitch when you connect them to oscilloscope or logic analyzer?
Have you seen that your oscilloscope triggers when you just sit on chair or stand up?
The higher spec of FPGAs, the more fine process technology is used. RS-232C transceivers are tolerant of +/-15,000V or more in human model. But FPGAs are tolerant of +/- 2000V or less.
It is said that electrical voltage from 3,000V to 10,000V would be observed when you hear a snick sound of ESD.
Wikipedia: Electrostatic-sensitive device
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