Digital Design with Cpld Applications and VHDL-Pld Lab by Robert Dueck

By Robert Dueck

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Hi-Z” How do the enable properties of these gates differ from gates such as AND and NAND? 2. 9 An AND needs two HIGH inputs to make a HIGH output. If the Control input is LOW, the output can never be HIGH; the output remains LOW. An OR output is HIGH if one input is HIGH. If the Control input is HIGH, the output is always HIGH, regardless of the level at the Signal input. In both cases, the output is “stuck” at one level, signifying that the gate is inhibited. 3 When the switch is open, it provides a logic HIGH because of the pull-up resistor.

Earlier versions of CMOS had a different set of unrelated numbers of the form 4NNNB or 4NNNUB where NNN was the logic function designator. 21 lists the quadruple 2-input NAND function as implemented in different logic families. These devices all have the same logic function, but different electrical characteristics. 22 lists several logic functions available in the high-speed CMOS family. These devices all have the same electrical characteristics, but different logic functions. 22 Part Numbers for Different Functions within a Logic Family (High-Speed CMOS) Part Number Function 74HC00 74HC02 74HC04 74HC08 74HC32 74HC86 Quadruple 2-input NAND Quadruple 2-input NOR Hex inverter Quadruple 2-input AND Quadruple 2-input OR Quadruple 2-input XOR Until recently, the most common way to package logic gates has been in a plastic or ceramic dual in-line package, or DIP, which has two parallel rows of pins.

A float switch in the tank monitors the level of gasoline. What logic level must the float switch produce to make the light flash when the tank is approaching empty? Why? 31 for the case where the AND gate is replaced by a NOR gate. 46 work properly if theAND gate is replaced by an Exclusive OR gate? Why or why not? a. 33. 43. State which two gates of the three shown are DeMorgan equivalents of each other. Explain your choice. X Y X Y X Y a. b. c. 25: Logic Gates b. 35 Name two logic families used to implement digital logic functions.

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