The fifth edition of Digital Principles and Applications is completely recorgnized. It is written for the individual who wishes to learn the principles of digital circuits and then apply them to useful,meaningful design. Thus the title. The material in this book is appropriate for an introductory coursein digital logic in either a computer or an electronics program. It is also appropriate for “self-study” and as a “reference” for individuals working in the field. Emphasis is given to the two most populardigital circuit (IC) families—transistor-transistor logic (TTL) and complementary metal oxide silicon(CMOS) logic. Many of these individual ICs are discussed in detail, and pinouts for more than 60digital IC chips are summarized in Appendix 8. Standard logic symbols are used along with the newIEEE standard logic. A review of the new IEEE symbols is given in the appendix.

It is not necessary to have a background in electronics to study this text. A familiarity with Ohm’s law and voltage and current in simple dc resistive circuits is helpful but not required. If you have no desire to learn about electronics, you can skip Chap. 13. To the extent possible, the remaining chapters are written to be independent of this material. If you have not studied electronics, Chap. 13 will provided the necessary background for you to converse successfully with those who have. Study it any time after Chap. 1. For “old-times” who have studied electronics, Chap. 13 will provide a good review and perhaps a new and valuable point of view. In any case, the material in Chap. 13 will certainly enhance both the knowledge and ability of anyone!

Each chapter begins with a contents that lists the subjects in each section. The contents listing is followed by a list of chapter objectives. At the end of each chapter section are review questions, called self-tests, which are intended to be a self-check of key ideas and concepts. At the end of each chapter, answers are supplied for the self-tests. A summary and a glossary are provided at the end of each chapter. In any subject area, there are many terms and concepts to be learned. The summary and glossary will provide you with the opportunity to be sure that you understand the exact meaning of these terms, phrases, and abbreviations, The end-of-chapter problems are arranged according to chapter sections. The problems reinforce ideas and concepts presented and allow you to apply them on your own. Solutions to selected odd-numbered problems are given at the end of the book. In addition, the appendix contains reference material that will be useful from time to time.

A complete set of experiments keyed to this text is available in a laboratory manual, Experiments for Digital Principles.

DONALD P. LEACH
ALBERT PAUL MALVINO