In digital electronics, Fan-out of 4 is a measure of time used in digital CMOS technologies: the gate delay of a component with a fan-out of 4. Fan out = Cload / Cin, where Cload = total MOS gate capacitance driven by the logic gate under consideration Cin = the MOS gate capacitance of the logic gate under consideration As a delay metric, one FO4 is the delay of an inverter, driven by an inverter 4× smaller than itself, and driving an inverter 4× larger than itself.
In digital electronics, Fan-out of 4 is a measure of time used in digital CMOS technologies: the gate delay of a component with a fan-out of 4. Fan out = Cload / Cin, where Cload = total MOS gate capacitance driven by the logic gate under consideration Cin = the MOS gate capacitance of the logic gate under consideration As a delay metric, one FO4 is the delay of an inverter, driven by an inverter 4× smaller than itself, and driving an inverter 4× larger than itself.
Source: Wikipedia "FO4" · CC BY-SA 4.0
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