Name of Subject  : DIGITAL ELECTRONICS  ( 3 IT 1)

Unit

Contents

Number systems, Coding Schemes: BCD, Excess-3, Grey, r's and (r-l)’s complement. Boolean Algebra,

I

Fundamental theorems, Simplifications of Boolean expressions. Logic gates and their truth table. Gate

implementation and Truth table of Boolean functions.

Standard forms of Boolean functions. Minterm and Maxterm designation of functions. Simplification of functions on

Karnaugh maps, Incompletely specified functions. Cubical representation of Boolean functions and determination

II

of prime implicants. Selection of an optimal set of prime implicants. Multiple output circuits and map minimization of

multiple output circuits. Tabular determination of multiple output prime implicants.

Combinational circuits – Adder, subtractor, encoder, decoder, multiplexer. Design of Combinational circuit using

III

Multiplexers.

Flip Flops: RS, J-K, D, T. Sequential circuits. Clock, pulse and level mode sequential circuits. Analysis and design

of sequential circuits. Synthesis of state diagrams, Finite memory circuits, equivalence relations equivalent states

IV

and circuits, determination of classes of indistinguishable states and simplification by implicants tables. Mealy and

Moore machines, state assignment and memory element input equations, Partitioning and state assignment.

Switching Devices. Positive and Negative logic of OR, AND, NOR, NAND, XOR and XNOR gates. Logic Family:

V

RTL, DTL, DCTL, TTL, RCTL, ECL, HTL, MOS and CMOS logic circuit. Speed and delay in logic circuits,

integrated circuit logic and noise immunity.