Question 1

The primary differences between a decoder and an encoder are:

Accepted Answer

D

Question 2

Decoders may at first appear to be quite difficult to understand but they are really quite simple. You need only remember:

Accepted Answer

Decoding is a process where each output line is activated by a unique combination of inputs, making it a straightforward operation once understood. This principle is fundamental to how decoders work, simplifying the concept of decoding.

Question 3

A 16- input multiplexer is to be used to perform parallel- to- serial data conversion. Which of the following counters would be required to provide the data select inputs?

Accepted Answer

A 16-input multiplexer requires a counter that can cycle through 16 different states to select each of the 16 inputs in turn. A MOD-16 counter provides exactly this capability, as it counts through 16 unique states (from 0 to 15) before resetting.

Question 4

When cascading two 74HC85 magnitude comparators, the outputs of the______order comparator are the final outputs that indicate the results of the comparison.

Accepted Answer

In cascading two 74HC85 magnitude comparators, the outputs of the higher-order comparator are the final outputs that indicate the results of the comparison, as it compares the more significant bits.

Question 5

A multiplexer/data selector is a logic circuit that:

Accepted Answer

A multiplexer, often abbreviated as MUX, accepts data inputs from several lines but allows only one of them at a time to pass through to the output. It essentially selects one of the input lines and connects it to the output.

Question 6

A BCD to decimal decoder would be required to have:

Accepted Answer

A BCD (Binary-Coded Decimal) decoder translates a 4-bit binary input into a decimal output. Since there are 10 possible decimal digits (0 through 9), the decoder needs 4 input lines (to represent numbers 0-9 in binary) and 10 output lines (one for each decimal digit).

Question 7

Decoders are normally used whenever:

Accepted Answer

Decoders are designed to activate a specific output or group of outputs only when a particular combination of inputs is present. This makes them ideal for tasks where a specific response is required for specific input conditions, such as selecting memory addresses or converting binary information into a more usable form.

Question 8

A demultiplexer accepts data from:

Accepted Answer

A demultiplexer takes a single input signal and selects one of many data-output-lines, which is then passed to the output of the demultiplexer.

Question 9

A three- line- to- eight line decoder has inputs CBA where A is the LSB. The output AND gates are labeled Q₀through Q₇. The output of AND gate Q₄should be active when the inputs are:

Accepted Answer

The answer of A three- line- to- eight line decoder...

Question 10

The IEEE/ANSI symbol for a decoder has the internal designation BCD/DEC. This means the decoder is a:

Accepted Answer

A BCD/DEC decoder is designed to convert Binary Coded Decimal (BCD) inputs into decimal outputs. BCD uses 4 bits to represent the ten decimal digits (0 to 9), so the decoder has four inputs (for the BCD) and ten outputs (one for each of the ten possible decimal digits).

Question 11

The IEEE/ANSI symbol for a decoder has the internal designation BCD/DEC, how many pins; including V_ccand ground, would this IC have?

Accepted Answer

A BCD/DEC decoder translates Binary Coded Decimal (BCD) inputs into decimal outputs. Given the designation, it implies a 4-bit BCD input to 10 decimal outputs, plus power (V), ground, and potentially an enable pin, leading to a total of 16 pins.

Question 12

The parallel data from a branch bank's computer terminal is to be transferred over telephone lines to the main bank's computer. You would expect to find a______at the transmitting end and _____at the receiving end.

Accepted Answer

A multiplexer is used at the transmitting end to combine multiple signals into one for transmission over a single line, while a demultiplexer at the receiving end separates the combined signals back into their original forms.

Question 13

CMOS devices are generally used to drive 7- segment LCD displays because:

Accepted Answer

CMOS devices are preferred for driving 7-segment LCD displays primarily because they consume less power than TTL (Transistor-Transistor Logic) devices. Additionally, their output voltage in the LOW state is usually less than that of TTL devices, which is beneficial for the power consumption and operational efficiency of the system.

Question 14

One would normally expect a 16- input multiplexer to have a minimum of:

Accepted Answer

A 16-input multiplexer requires 4 select lines because 2^4 = 16, allowing for the selection of any one of the 16 input lines.

Question 15

How many binary output lines would be required for a four- digit BCD- to- binary converter?

Accepted Answer

The answer of How many binary output lines would be...

Question 16

A certain BCD- to- decimal decoder has four input lines and 10 output lines. If four input lines are capable of 16 possible combinations and only 10 output combinations are required, why have four inputs?

Accepted Answer

The answer of A certain BCD- to- decimal decoder has...

Question 17

A decoder has outputs labeled through . The output gates for this device are:

Accepted Answer

The answer of A decoder has outputs labeled through ....

Question 18

The decoder described in the preceding question has three inputs labeled A₂, A₁, and A₀where A₂ is the MSB. If the input is 010₂, the conditions of the output gates should be:

Accepted Answer

The answer of The decoder described in the preceding question...

Question 19

Multiplexing of digital signals is usually required when:

Accepted Answer

The answer of Multiplexing of digital signals is usually required...

Question 20

A 7445 decoder has IEEE/ANSI symbol internal markings of BCD/DEC with a small triangle underneath. Also, there is an underlined diamond at each output. These symbols mean the device is a:

Accepted Answer

The small triangle indicates active-low outputs, and the underlined diamond signifies open-collector outputs. Thus, it's a BCD to decimal decoder buffer/driver with open-collector outputs.

Quiz 9: MSI Logic Circuits

The primary differences between a decoder and an encoder are:

Decoders may at first appear to be quite difficult to understand but they are really quite simple. You need only remember:

A 16- input multiplexer is to be used to perform parallel- to- serial data conversion. Which of the following counters would be required to provide the data select inputs?

When cascading two 74HC85 magnitude comparators, the outputs of the______order comparator are the final outputs that indicate the results of the comparison.

A multiplexer/data selector is a logic circuit that:

A BCD to decimal decoder would be required to have:

Decoders are normally used whenever:

A demultiplexer accepts data from:

A three- line- to- eight line decoder has inputs CBA where A is the LSB. The output AND gates are labeled Q₀through Q₇. The output of AND gate Q₄should be active when the inputs are:

The IEEE/ANSI symbol for a decoder has the internal designation BCD/DEC. This means the decoder is a:

The IEEE/ANSI symbol for a decoder has the internal designation BCD/DEC, how many pins; including V_ccand ground, would this IC have?

The parallel data from a branch bank's computer terminal is to be transferred over telephone lines to the main bank's computer. You would expect to find a__at the transmitting end and _at the receiving end.

CMOS devices are generally used to drive 7- segment LCD displays because:

One would normally expect a 16- input multiplexer to have a minimum of:

How many binary output lines would be required for a four- digit BCD- to- binary converter?

A certain BCD- to- decimal decoder has four input lines and 10 output lines. If four input lines are capable of 16 possible combinations and only 10 output combinations are required, why have four inputs?

A decoder has outputs labeled through . The output gates for this device are:

The decoder described in the preceding question has three inputs labeled A₂, A₁, and A₀where A₂ is the MSB. If the input is 010₂, the conditions of the output gates should be:

Multiplexing of digital signals is usually required when:

A 7445 decoder has IEEE/ANSI symbol internal markings of BCD/DEC with a small triangle underneath. Also, there is an underlined diamond at each output. These symbols mean the device is a:

Quiz 9: MSI Logic Circuits

The primary differences between a decoder and an encoder are:

Decoders may at first appear to be quite difficult to understand but they are really quite simple. You need only remember:

A 16- input multiplexer is to be used to perform parallel- to- serial data conversion. Which of the following counters would be required to provide the data select inputs?

When cascading two 74HC85 magnitude comparators, the outputs of the______order comparator are the final outputs that indicate the results of the comparison.

A multiplexer/data selector is a logic circuit that:

A BCD to decimal decoder would be required to have:

Decoders are normally used whenever:

A demultiplexer accepts data from:

A three- line- to- eight line decoder has inputs CBA where A is the LSB. The output AND gates are labeled Q0 through Q7. The output of AND gate Q4 should be active when the inputs are:

The IEEE/ANSI symbol for a decoder has the internal designation BCD/DEC. This means the decoder is a:

The IEEE/ANSI symbol for a decoder has the internal designation BCD/DEC, how many pins; including Vcc and ground, would this IC have?

The parallel data from a branch bank's computer terminal is to be transferred over telephone lines to the main bank's computer. You would expect to find a______at the transmitting end and _____at the receiving end.

CMOS devices are generally used to drive 7- segment LCD displays because:

One would normally expect a 16- input multiplexer to have a minimum of:

How many binary output lines would be required for a four- digit BCD- to- binary converter?

A certain BCD- to- decimal decoder has four input lines and 10 output lines. If four input lines are capable of 16 possible combinations and only 10 output combinations are required, why have four inputs?

A decoder has outputs labeled through . The output gates for this device are:

The decoder described in the preceding question has three inputs labeled A2, A1, and A0 where A2 is the MSB. If the input is 0102, the conditions of the output gates should be:

Multiplexing of digital signals is usually required when:

A 7445 decoder has IEEE/ANSI symbol internal markings of BCD/DEC with a small triangle underneath. Also, there is an underlined diamond at each output. These symbols mean the device is a:

A three- line- to- eight line decoder has inputs CBA where A is the LSB. The output AND gates are labeled Q₀through Q₇. The output of AND gate Q₄should be active when the inputs are:

The IEEE/ANSI symbol for a decoder has the internal designation BCD/DEC, how many pins; including V_ccand ground, would this IC have?

The parallel data from a branch bank's computer terminal is to be transferred over telephone lines to the main bank's computer. You would expect to find a__at the transmitting end and _at the receiving end.

The decoder described in the preceding question has three inputs labeled A₂, A₁, and A₀where A₂ is the MSB. If the input is 010₂, the conditions of the output gates should be: