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System Management Bus
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====Input Voltage (''V<sub>IL</sub>'' and ''V<sub>IH</sub>'')==== When mixing devices, the IΒ²C specification defines the input levels to be 30% and 70% of the supply voltage ''V<sub>DD</sub>'',{{r|nxp_com_UM10204_3|p=9}} which may be 5 V, 3.3 V, or any other value. Instead of relating the bus input levels to ''V<sub>DD</sub>'', SMBus defines them to be fixed. SMBus 2.0 defines ''V<sub>IL,max</sub>'' at 0.8 V and ''V<sub>IH,min</sub>'' at 2.1 V, and supports a ''V<sub>DD</sub>'' ranging from 3 to 5 V, while in SMBus 3.0, the levels are defined at 0.8 and 1.35 V, with a ''V<sub>DD</sub>'' ranging from 1.8 to 5 V.<ref name="smbus_org-smbus30" />
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