Digital Electronics: Principles, Devices and Applications

110 Digital Electronics(c) a three-input NAND with an open collector output;(d) a four-input INHIBIT gate.7. Define the fan-out specification of a logic gate. Which parameters would you need to know fromthe data sheet of a logic gate to determine for yourself the fan-out in case it is not mentioned in thedata sheet? Explain the procedure for determining the fan-out specification from those parameters.What are the consequences of exceeding the fan-out specification?8. What is the main significance of IEEE/ANSI symbols when compared with the conventional ones?Draw the ANSI symbols for four-input OR, two-input AND, two-input EX-OR and two-inputNAND gates.Problems1. What is the only input combination that:(a) Will produce a logic ‘1’ at the output of an eight-input AND gate?(b) Will produce a logic ‘0’ at the output of a four-input NAND gate?(c) Will produce a logic ‘1’ at the output of an eight-input NOR gate?(d) Will produce a logic ‘0’ at the output of a four-input OR gate?(a) 11111111; (b) 1111; (c) 00000000; (d) 00002. Draw the truth table of the logic circuit shown in Fig. 4.56.ABCDYFigure 4.56 Problem 2.A0000000011111111B0000111100001111C0011001100110011D0101010101010101Y1010101110111011Figure 4.57 Solution of problem 2.