Digital Electronics 2_ Lecture 1.pdf - EEE 306:Digital...

EEE 306:Digital Electronics II

Course Description:
• Medium-Scale-Integrated (MSI) devices and their applications: Decoders, Encoders, Multiplexers, De-multiplexers,
Adders and Subtractors, Magnitude Comparators: HDL for MSI circuits:
• Memory devices: Semiconductor memories: ROMs, PROMs, EPROMs, EEPROMs, Flash memories, PLAs and PALs,
static RAM, dynamic RAM, CCD memories, FPGAs and ASICs: Expanding word size and capacity: Applications of
different memory devices:
• Sequential logic circuits: Analysis of sequential logic circuits using state equations, state tables and state
diagrams: State reduction: Design of sequential circuits: HDL for sequential logic circuits: Timing circuits; Astable
and mono-stable multi-vibrator circuits and their applications, crystal oscillator circuits:
• Analogue-to-Digital (A/D) and Digital-to-Analogue (D/A) conversion: Basic concepts, D/A conversion: weighted
resistor DAC, R-2R ladder DAC. A/D conversion: Digital ramp DAC, successive approximation DAC, dual-slope ADC,
Flash ADC: General ADC and DAC specifications and applications:
• Introduction to microcomputers and microcomputer organization: Microcomputer components and the working
of a microcomputer, working of a microprocessor, types of microprocessors, programming model of a
microprocessor, basic concepts of microprocessor interfacing.
Textbooks and References
• MANO M. M., CILETTI M. D., Digital Design, 4th Edition, Prentice Hall, 2006.
• PALNITKAR S., Verilog HDL, 2nd Edition, Prentice Hall, 2003
• AMBROSIO Frank J., Microprocessors and Microcomputers: Hardware and Software (6th Edition), Prentice Hall,
2002
• A. SAHA, N MANNA, Digital Principles and Logic Design, 2007

MSI COMBINATIONAL LOGIC
CIRCUITS AND THEIR APPLICATIONS

Introduction
• Digital systems consists of two types of circuits;
– Combinational logic circuits; Consists of circuits where the outputs are
determined only by the present combination of inputs and does not depend
on the previous inputs or state of outputs
– Sequential logic circuits; Logic circuits that contain both logic gates and also
memory cells. The circuit outputs is determined by both the present inputs
and also the past inputs. As such, the circuit behavior must be specified by by
a time sequence of inputs and memory states
– Digital ICs are often categorized according to their circuit complexity as
measured by the number of logic gates they contain;
Complexity Number of logic gates
Small Scale Integration (SSI) <12
Medium Scale Integration (MSI) 12-99
Large Scale Integration (LSI) 100-9,999
Very Large Scale Integration
(VLSI)
>10,000

Medium Scale Integrated (MSI)
devices
• MSI devices are used as building blocks for more complex digital
circuits.
• They perform specific digital functions commonly needed in the
design of combinational logic circuits and are available in IC form
• Digital circuit design using MSI devices results in significant
reduction in the number of ICs required to implement logic circuits
as compared to circuit implementation using SSI devices.