In Basic Electronics, we explained the basic concepts and fundamentáis of electronic devices and circuits. In this book, Basic Digital Electronics, we explain the basic concepts rind fundamentáis of digital system functions, and the circuits used to perform those functions and build digital electronic systems. No segment of electronics has expanded more rapidly than digital electronics, led by the small size, low power, high reliability and low cosí of integrated circuits, where all the circuitry is formed and interconnected on a single chip of silicon. Basic Digital Electronics explains in detail how digital circuits are designed and applied in systems that execute specific tasks. In a straightforward, easy-to-read language, using detailed illustrations, practical worked-out application examples solidify the understanding of the concepts as the discussions proceed. Anyone who wants to know about digital systems, and how engineers design digital circuits shouid bo able to learn from the explanations in Basic Digital Electronics. Basic Digital Electronics begins by identifying familiar systems to help understand the differonce between analog and digital systems, and identifies the common functions required when designing digital systems. Digital circuits, and how they are designed, covering logic circuits that make decisions, sequential circuits for temporary storage, <i variety of circuits to couple, convert and compute digitally, and memory circuits fo' more permanent storage of digital information are discussed in the next four chapiers. The vvide application of digital electronics to systems wouid not be possible without integrated circuits. A complete chapter is devoted to explain the basic techniquc", and manufacturing steps used to fabricate, assemble and test integrated circuits. The iost two chapters conclude the learning by showing how the circuits and functions dre combined into systems?first for computers, and then for digital communnations. Multiple-choice quizzes and a set of questions and problems at the end of each chapter reinforce the learning. Answers to quizzes are on the quiz page; worked-out answers to questions and problems are given in the Appendix. Studying the material, understanding the worked-out examples, working the quizzes and solving the problems shouid result in an understanding of the basic concepts and fundamentáis of digital electronics. That was the goal of writing Basic Digital Electronics; we hope we have succeeded.