4EC3-DIGITAL ELECTRONICS

UNIT 1 : NUMBER SYSTEMS, BASIC LOGIC GATES &  BOOLEAN ALGEBRA:

Binary Arithmetic

& Radix representation of different numbers. Sign & magnitude representation, Fixed point

representation, complement notation, various codes & arithmetic in different codes & their inter

conversion. Features of logic algebra, postulates of Boolean algebra. Theorems of Boolean algebra.

Boolean function. Derived logic gates: Exclusive-OR, NAND, NOR gates, their block diagrams and

truth tables. Logic  diagrams from Boolean expressions and vica-versa. Converting logic diagrams to

universal logic. Positive, negative and mixed logic. Logic gate conversion.

UNIT 2 : DIGITAL LOGIC GATE CHARACTERISTICS:

TTL logic gate characteristics. Theory &

operation of TTL NAND gate circuitry. Open collector TTL. Three state output logic. TTL subfamilies.

MOS & CMOS logic families. Realization of logic gates in RTL, DTL, ECL, C-MOS & MOSFET.

Interfacing logic families to one another.

UNIT 3

:

MINIMIZATION TECHNIQUES:

Minterm, Maxterm, Karnaugh Map, K map upto 4 variables.

Simplification of logic functions with K-map, conversion of truth tables in POS and SOP form.

Incomplete specified functions. Variable mapping. Quinn-Mc Klusky minimization techniques.

UNIT 4

:

COMBINATIONAL  SYSTEMS:

Combinational  logic circuit design, half and full adder,

subtractor. Binary serial and parallel adders. BCD adder. Binary multiplier. Decoder: Binary to Gray

decoder, BCD to decimal, BCD  to  7-segment  decoder.  Multiplexer,  demultiplexer, encoder. Octal

to binary, BCD to excess-3 encoder. Diode switching matrix. Design of logic circuits by multiplexers,

encoders, decoders and demultiplexers.

UNIT 5

:

SEQUENTIAL  SYSTEMS:

Latches, flip-flops, R-S, D, J-K, Master Slave flip flops.

Conversions of flip-flops. Counters : Asynchronous (ripple), synchronous and synchronous decade

counter, Modulus counter, skipping state counter,  counter  design.  Ring counter. Counter

applications. Registers: buffer register, shift register.