| 摘要 |
In an IC chip having multiple power supply rails, ESD protection circuitry is provided. The ESD protection circuitry protects each power supply rail from an ESD impulse with respect to ground and with respect to the other power supply rails. The ESD protection circuitry is power sequence independent thereby eliminating any restrictions on the sequencing of power as applied to, and removed from, the different power supply rails of the IC chip. A discharge device is controlled by a biasing device such that ESD impulses are passed through the discharge device, but power supply current is not passed therethrough during power sequencing.
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