Step Response and Fan-Out The fan-out of a digital device is defined as the maximum number of inputs to similar devices that can be reliably driven by the device output. Figure P11–82 is a simplified

diagram of a device’s output driving n identical capacitive inputs. To operate reliably, a 5-V step function at the device output must drive the capacitive inputs to 3.7 V in 10 ns or less. Determine the device fan-out for R ¼ 1 kVand C¼ 3 pF.

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1 Interconnect 2 Driver vs(t) + R w C Loads FIGURE P11-82 Loads n 1 2 n