By Buchla

Experiments in electronic basics via Buchla, David M. [Prentice corridor, 2008]...

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Extra info for Experiments in Digital Fundamentals, 10th Edition

Sample text

Suppose you needed a 2-input NOR gate for a circuit, but all you have available is a 7400 (quad 2-input NAND gate). Show how you could obtain the required NOR function using the NAND gate. ) 5. A control signal that is used in a computer system is labeled DT/R for data transmit/receive. What action is implied when this signal is HIGH? LOW? 6. Assume you were troubleshooting a circuit containing a 4-input NAND gate and you discover that the output of the NAND gate is always HIGH. Is this an indication of a bad gate?

The newer ANSI/IEEE rectan­ gular symbols are shown along with the older distinctive-shape symbols. The ANSI/IEEE symbols contain a qualifying symbol to indicate the type of logic operation performed. The distinctive-shape symbols for logic gates are still very popular because they enable you to visualize the standard Boolean operations of AND, OR, and INVERT im­ mediately. The distinctive shapes also enable you to analyze logic networks because each gate can be represented with a positive logic symbol or an equivalent negative logic symbol.

The newer ANSI/IEEE rectan­ gular symbols are shown along with the older distinctive-shape symbols. The ANSI/IEEE symbols contain a qualifying symbol to indicate the type of logic operation performed. The distinctive-shape symbols for logic gates are still very popular because they enable you to visualize the standard Boolean operations of AND, OR, and INVERT im­ mediately. The distinctive shapes also enable you to analyze logic networks because each gate can be represented with a positive logic symbol or an equivalent negative logic symbol.