Refer to the logic diagram of Figure 8-53, where the 74LS86 exclusive-OR output is driving several 74LS20

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Refer to the logic diagram of Figure 8-53, where the 74LS86 exclusive-OR output is driving several 74LS20 inputs. Determine whether the fan-out of the 74LS86 is being exceeded, and explain. Repeat using all 74AS devices. Use Table 8-7.


Figure 8-53

A B +74LS86 H M 00 X F Z R All NAND gates are 74LS20s EDED W


Table 8-7

TTL Series 74 74S 74LS 74AS 74ALS 74F Outputs IOH -0.4 mA -1 MA -0.4 mA -2mA -0.4 mA -1 mA IOL 16 MA 20 mA 8

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Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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