3.1. Electrical characteristics of SMBus devices – two discrete worlds
SMBus 2.0 is expected to operate in at least two different mutually exclusive environments that have
different electrical requirements. In one case, SMBus must operate reliably in the traditional low-power
environment of the battery devices that are at its roots. It must also operate reliably in the higher-noise
environment of the PCI connector and PCI add-in cards. This specification meets these needs by providing
two classes of electrical characteristics as called out below. Most of these specifications deal with voltage
levels, noise margins, etc. Of course, many specific items, including general AC specifications, are the
same in both environments.
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