The course introduces the fundamental principles of various digital devices both discrete components and integrated components that find application in digital electronics. It covers the following topics: Switching devices, diodes and transistors as switching devices, analysis of switching circuits and switching times. Logic technologies and families, digital terminology. TTL family, TTL loading rules, totem pole, open collector and tristate. ECL family. MOS technology, operation and types, MOS inverter, MOS NAND, MOS NOR. NMOS, PMOS, CMOS, dynamic MOS, CMOS transmission circuits. MOS memory elements and types, programmable logic devices. Interfacing, TTL driving CMOS, flip-flops, multivibraters, monostables, astables, Schmitt trigger, bistables, 555 IC timer. Analog to digital converter and digital to analog converter.