Unit 6: Functions of Combination Logic Gates
The sum of the binary numbers 1111 and 0011 is
10010
The difference between the binary numbers 10101 and 110 is
1111
A 4-bit binary to decimal decoder IC has ________ data input connection(s).
4
Best describes the function of a decoder?
A decoder will convert a binary number into a specific output representing a particular character or digit.
The three inputs to a full adder are labeled A, B, and
Cin (carry in)
A decoder is an electronic device that translates from decimal to an encrypted code such as binary. (T or F)
False
Using 2s complement representation, the sign of a number can be determined but not the magnitude. (T or F)
False
A BCD-to-decimal decoder can be classified as a 4-line to 10-line decoder. (T or F)
True
A full adder can be wired using two half adders and an OR gate. (T or F)
True
A half-adder has no carry-in bit. (T or F)
True
Converting a decimal number into a binary number is an example of an encoder. (T or F)
True
In a binary number such as 101010, the leftmost digit is the most significant bit (MSB). (T or F)
True
Since the display driver is generally packaged in the same IC as a decoder, it is often referred to as a seven-segment decoder/driver. (T or F)
True
When paralleling 2-bit full-adders, the carry-out of each stage is connected to the carry-in of the next-higher stage. (T or F)
True
A half-adder circuit contains what type of gate that feeds the sum output and an and gate which generates the CO (carry out) output?
XOR
The process of causing all LEDs on a 7-segment display to remain "unlit" is called
blanking
A decoder:
converts a code into an output
An encoder:
converts an input to a code
What type of logic device would be used to convert binary numbers into their decimal equivalent?
decoder
A multiplexer has _____ input(s) and _____ output(s).
many, one
When the MSB of the 2s complement number is a 1, the number is
negative
A demultiplexer has _____ input(s) and _____ output(s).
one, many
A multiplexer can change _____ data into data____
parallel, serial
A demultiplexer can change _____ data into _____ data.
serial, parallel
