MSI Logic Circuits
For the inputs shown in the given figure, the outputs for P > Q, P = Q, and P < Q are ____, ____, and ____, respectively
A 75154 1-of-16 decoder has 16 outputs and decodes an input of ________ bits
Referring to the figure given below, what output code will appear on the output
(A3,A2,A1,A0) when the 5 key is pressed
A 16-input multiplexer is to be used to perform parallel-to-serial dataconversion.
Which of the following counters would be required to provide the data select inputs
Multiplexing of digital signals is usually required when
moving data over long distance transmission lines.
moving data internally within a microprocessor.
moving data between memory and storage registers in a microprocessor.
moving data internally within a microprocessor or between memory and storage registers.
The diagram given below shows a ________, and in order for the decimal number 3 to be displayed, terminals ________ must be ________
common-anode seven-segment display, abcdg, HIGH
common-cathode seven-segment display, abcdg, HIGH
common-cathode seven-segment display, ef, LOW
common-anode seven-segment display, abcdg, LOW
The circuit in Figure 9-8 is defective; data is not appearing on the outputlines.
A check with the scope shows data pulses on the serial data line and multiplex control lines, S0–S2; no parity error isindicated.
A further check with a logic probe indicates that Vcc and ground appear to bepresent.
What might be wrong with the circuit
The parity generator may be bad.
The parity checker is defective.
The demultiplexer may be bad.
The parity checker is defective, or the parity generator may be bad.
Refer to the keyboard encoder in figure
(a). Sometimes when the 5 key is pressed, the system attached to the keypad does notrespond.
The 5 input on the 74147 is monitored with a digital storage scope while repeatedly pressing the 5 key, and the waveform in figure
(b) is obtained; the P above the trace indicates the points at which the technician pressed thekey.
What is most likely wrong with the circuit
The switches on the 5 key are intermittent; the contacts need to be cleaned or the switch replaced.
The pull-up resistor connected to the 5 key is bad and should be replaced.
The 74147 is intermittent, possibly due to high temperature, and should be replaced.
It is suspected that the comparator in the figure given below has aproblem.
The inputs are activated in the table shown below and the corresponding outputsnoted.
What is most likely wrong with the circuit? For P0 – P3 = 1 and Q0 – Q3 = 0, P > Q = 1, P = Q = 1, P
Q = 0, P = Q = 1, P
Q = 0, P = Q = 1, P < Q = 0
Nothing is wrong; the circuit is functioning properly.
The P = Q output is shorted to Vcc.
The P0–P3 inputs are defective.
One or more of the Q inputs is bad.
The 74139 dual four-line demultiplexer functions as a decoder if ________
The diagram given below shows a ________ being used as a(n) ________ and Y = ________
multiplier, divider, 2.25
logic function generator, multiplexer, 1467
multiplexer, logic function generator, ABC + ABC + ABC + ABC
multiplexer, encoder, 7641
In an AHDL BCD to binary code converter, how is multiplication by 10 accomplished
By using the library multiplication function
By using the multiplication operator
By using the shifting of bits
By using integer types
Which is the decimal number for the BCD number, 10110110
10110110 is not a valid BCD number.
A 1-of-8 octal decoder has eight outputs and decodes an input of ________ bit(s)
What type of device is shown in the given figure, and what inputs
(A3,A2,A1,A0) are required to produce the output levels as shown
A decimal-to-binary decoder; 1,1,1,0
A decimal-to-BCD encoder; 1,1,1,0
A BCD-to-decimal decoder; 0,1,1,1
A binary-to-decimal encoder; 0,1,1,1
The device that generates a coded output from a single active numeric input line is ________
How is the number one
(1) indicated on the outputs of a 7447 BCD-to-seven-segment code converter
Segments b and c are active.
Segment a is active.
Segment b is active.
Segments a and b are active.
For the input values
(A0–A3, B0–B3, Data Select =
1) given for the circuit given below, what will be indicated on the displays
A = 0, B = 5
A = 0, B = 6
A = 5, B = 0
A = 6, B = 0
The IEEE/ANSI symbol for a decoder has the internal designation bcd/dec.
This means the decoder is a
BCD-to-decimal decoder with ten inputs and four outputs.
decimal-to-BCD decoder with ten inputs and four outputs.
BCD-to-decimal decoder with four inputs and ten outputs.
decimal-to-BCD decoder with four inputs and ten outputs.
Why are control inputs included in an HDL magnitude comparator
For internal interconnections
For signal control
For control signal input
For cascading the chips
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Sequential Logic Circuits
Programmable Logic Device
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Logic Families and Their Characteristics
Boolean Algebra and Logic Simplification