Combinational Digital Circuits Overview

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What is the primary factor that determines the output of a combinational digital circuit?

Current input values (correct)

Previous input values

Output of the previous circuit

State of the memory element

What is used to describe the behavior of a combinational digital circuit?

Flowcharts

State diagrams

Block diagrams

Truth tables (correct)

What is a key characteristic of combinational digital circuits?

They are sequential

They are deterministic (correct)

They have memory elements

They exhibit random behavior

What is used to analyze and design combinational digital circuits?

Boolean algebra Signup and view all the answers

What are combinational digital circuits built using?

Basic logic gates Signup and view all the answers

What is the primary function of a multiplexer?

To select one of multiple input data lines and direct it to the output Signup and view all the answers

What is the primary function of an encoder?

To convert multiple input lines into a binary code Signup and view all the answers

What is the main difference between a half adder and a full adder?

A half adder adds two binary digits without considering the carry from a previous addition, while a full adder adds three binary digits Signup and view all the answers

What is the function of a decoder?

To convert a binary code into a set of outputs Signup and view all the answers

What is the primary component of a subtraction circuit?

XOR gates and inverters Signup and view all the answers

What is the function of a full subtractor?

To subtract one binary digit from another, considering a borrow from a previous subtraction Signup and view all the answers

What is the borrow output in a half-subtractor?

A'.B Signup and view all the answers

What is the output of the second half adder in a full adder?

Sum = Cin  (A  B) Signup and view all the answers

What is the difference between a half-subtractor and a half-adder?

The expressions for the SUM and DIFFERENCE outputs are the same Signup and view all the answers

How can a full adder be implemented?

With two half-adders and one OR gate Signup and view all the answers

Which arithmetic operation involves iterative subtraction and shifting similar to decimal division?

Division Signup and view all the answers

What is the function of a magnitude comparator?

To determine the relative magnitudes of two numbers Signup and view all the answers

What is the purpose of a digital comparator?

To compare two binary numbers and determine their relationship Signup and view all the answers

Which type of comparator compares two N-bit binary numbers by comparing each corresponding bit from the most significant bit (MSB) to the least significant bit (LSB)?

N-Bit Comparator Signup and view all the answers

What is the result of a left shift operation on a binary number?

Multiplication by powers of 2 Signup and view all the answers

What is the purpose of a parity generator in digital systems?

To generate the parity bit at the transmitting side Signup and view all the answers

What is the difference between even parity and odd parity?

Even parity has an extra bit of 0 for even quantities of 1s and 1 for odd quantities Signup and view all the answers

What is the purpose of a parity checker in digital systems?

To produce a check bit for error detection in the receiver Signup and view all the answers

What is the function of a decoder in digital systems?

To activate exactly one of 2n outputs based on an n-bit input value Signup and view all the answers

What is the boolean expression for even parity?

Pe = A(BC) Signup and view all the answers

What is the role of a demultiplexer in digital circuits?

Distributes a single input line to multiple output lines based on a control signal Signup and view all the answers

What does a full adder do that a half adder does not?

Has a carry input from a previous stage Signup and view all the answers

What function does a comparator perform?

Compares two binary numbers and indicates their relationship Signup and view all the answers

What is the primary function of an Arithmetic Logic Unit (ALU) in digital systems?

Performs arithmetic and logic operations on binary numbers Signup and view all the answers

How is the sum output (S) of a full adder calculated?

OR of A, B, and Cin Signup and view all the answers

In a 3-to-8 line decoder, what input configuration results in the output Y1 being active?

A= 0, B= 1 Signup and view all the answers

What is the purpose of a 3-to-8 line decoder in binary-to-octal conversion?

Convert binary numbers to octal Signup and view all the answers

How many input lines and output lines does a 2-to-1 line multiplexer have?

2 input lines, 1 output line Signup and view all the answers

What determines which input is selected and routed to the output line in a multiplexer?

Selection lines Signup and view all the answers

For a 4-to-1 line multiplexer, what is the function of the selection lines S0 and S1?

Select one of the four input channels Signup and view all the answers

What is the primary difference between a encoder and decoder?

An encoder converts binary information to unique output lines, while a decoder performs the inverse operation. Signup and view all the answers

What problem can occur in the octal-to-binary encoder if two inputs are active simultaneously?

The output will be 111, representing a combination of both inputs. Signup and view all the answers

What solution is implemented to ensure only one input is encoded in an encoder?

Assigning a higher priority to inputs with lower subscript numbers Signup and view all the answers

Why is a third output, 'V', included in a priority encoder circuit?

To validate the presence of valid input data Signup and view all the answers

In a priority encoder, how does the priority of inputs affect the output?

Higher priority inputs will take precedence when multiple inputs are active Signup and view all the answers