11–91 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 P11–91 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= 680 Ω and C = 2 pF.

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Interconnect 2 Driver vs(1) +1 Loads C n R www C 2 C FIGURE P11-91 Loads n