The original 10Base-T Ethernet chips were fairly large geometry CMOS products that were not very sensitive to static over-voltage. Newer 10/100 Ethernet de- vices however have become extremely sensitive to latch-up or damage as lC manufacturers have moved t0 0.35-micron and smaller line widths. These small geometries are sensitive to fatal electrostatic dis- charges that may originate from a charged cable, lightning or a "human body".
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