In the mids, the first electronic digital computer, the Eni- d logic circuits based on vacuum tubes. The rest of ok is written to be as independent of this stuff as possible. Section 3. Wakerly Copying Prohibited s.
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In the mids, the first electronic digital computer, the Eni- d logic circuits based on vacuum tubes. The rest of ok is written to be as independent of this stuff as possible. Section 3. Wakerly Copying Prohibited s. A logic family is a collection of different integrated-circuit chips that imilar input, output, and internal circuit characteristics, but that perform nt logic functions.
Chips from the same family can be interconnected to any desired logic function. On the other hand, chips from differing fam- ay not be compatible; they may use different power-supply voltages or e different input and output conditions to represent logic values. First introduced in the s, ow is actually a family of logic families that are compatible with each ut differ in speed, power consumption, and cost. Digital systems can mix nents from several different TTL families, according to design goals and ints in different parts of the system.
Even then, MOS circuits lagged bipolar circuits con- ly in speed, and were attractive only in selected applications because of wer power consumption and higher levels of integration. By far the majority of new large-scale integrated circuits, s microprocessors and memories, use CMOS. Likewise, small- to medi- le applications, for which TTL was once the logic family of choice, are kely to use CMOS devices with equivalent functionality but higher speed er power consumption.
MOS logic is both the most capable and the easiest to understand com- l digital logic technology. In Section 3. Fi Lo CM 1. Wakerly Copying Prohibited ed within a single system. MOS Logic nctional behavior of a CMOS logic circuit is fairly easy to understand, your knowledge of analog electronics is not particularly deep. However, real logic cir- rocess electrical signals such as voltage levels. In any logic circuit, there ge of voltages or other circuit conditions that is interpreted as a logic 0, other, nonoverlapping range that is interpreted as a logic 1.
Voltages in the intermediate range are not expected to occur except during signal transitions, and yield ned logic values i. CMOS s using other power supply voltages, such as 3. MOS Transistors S transistor can be modeled as a 3-terminal device that acts like a voltage- lled resistance. As suggested by Figure , an input voltage applied to rminal controls the resistance between the remaining two terminals.
Wakerly Copying Prohibited here are two types of MOS transistors, n-channel and p-channel; the refer to the type of semiconductor material used for the resistance-con- terminals. The terminals are called gate, source, and drain.
Digital Design: Principles and Practices, 4th Edition
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Digital Design Principles And Practices - Wakerly
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