Fungsi Kombinasi Logika

Chaper 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

0 + 1 = 1

1 + 0 = 1

1 + 1 = 10

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-addres.

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-segment decoder

 

Multiplexer (data Selector)

Ø  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.

Ø  The basic multiplexer has several data-input lines and a single output line.

Ø  It also has data-select inputs, which permit digital data on any one of the inputs to be switched to the output line. 

Demultilexer

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

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

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