Fungsi Kombinasi Logika

Chapter Objectives

-Distinguish between half-adder and full-adder

-Use BCD-to-7-segment decoders in display systems

-Apply multiplexer in data selection

-Use decoders as multiplexer

Half-Adder

Simple Binary Addition

0 + 0 = 0           Zero plus zero equals zero

0 + 1 = 1           Zero plus one equals one

1 + 0 = 1           One plus zero equals one

1 + 1 = 10         One plus one equals zero with a carry of one

Basic Adder

Adder are important in computers and also in other types of digital systems in which numerical data are processed

The Full-Adder

The Full-Adder accepts two input bits and an input carry and generates a sum output and an output carry

Parallel Binary Adder

A single full-adder is capable of adding two 1-bit numbers and an input carry. To add binary numbers with more than one bit, we must use additional full-adders.

Comparators

The basic function of a comparator is to compare the magnitude of two binary quantities to determine the relationship of those quantities

• 1-Bit Comparator
• 2-Bit Comparator
• 4-Bit Comparator

Decoders

-Binary decoder

-4-bit decoder

-BCD-to-decimal decoder

-BCD-to-7-segement decoder

Encoders

-Decimal-to-BCD encoder

-8-line-to-3-line encoder

An encoder is a combinational logic circuit that essentially performs a “reverse” decoder function.

Multiplexer (Data Selectors)

• A multiplexer (MUX) is a device that allows digital information from several sources to be routed onto a single line for transmission over that line to a common destination.
• The basic multiplexer has several data-input lines and a single output line.
• It also has data-select inputs, which permit digital data on any one of the inputs to be switched to the output line.

Demultiplexers

-A demultiplexer (DEMUX) basically reverses the multiplexing function.

-It takes digital information from one line and distributes it to a given number of output lines.

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