Pulse and Digital Circuits

10.1 INTRODUCTION

In digital applications, data is in the form of binary bits—0s and 1s. A logic gate is a digital circuit that gives a specific discrete output (0 or 1) depending on the input conditions. These logic gates can be wired using discrete components such as resistors, diodes, transistors, FETs, and their combinations. The simplest logic gate, say a two-input AND / OR gate (diode–resistance logic gate), may be constructed using two diodes, a resistance and a dc source. The important logic families are diode–transistor logic (DTL), transistor–transistor logic (TTL), p-channel and n-channel MOSFET logic (PMOS and NMOS) and complementary MOSFET logic (CMOS). The TTL family is further subdivided into open-collector TTL, emitter-coupled ...