Home » Digital Electronics » MSI Logic Circuits

What is the purpose of a decoder's inputs?

To allow the decoder to respond to the inputs to activate the correct output gate.
To disable the decoder outputs so that all outputs will be inactive.
To disable the inputs and activate all outputs.
To allow the decoder to respond to the inputs to activate the correct output gate, and to disable the inputs and activate all outputs.

Correct Answer: To allow the decoder to respond to the inputs to activate the correct output gate, and to disable the inputs and activate all outputs.

← Previous Question Next Question→

More Questions from MSI Logic Circuits

Referring to the figure given below, what output code will appear on the output (A3,A2,A1,A0) when the 5 key is pressed?
It is suspected that the comparator in the figure given below has a problem. The inputs are activated in the table shown below and the corresponding outputs noted. 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 For P0 – P3 = 0 and Q0 – Q3 = 1, P > Q = 0, P = Q = 1, P < Q = 1 For P0 – P3 = 1 and Q0 – Q3 = 1, P > Q = 0, P = Q = 1, P < Q = 0
Refer to the keyboard encoder in figure (a). Sometimes when the 5 key is pressed, the system attached to the keypad does not respond. 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 the key. What is most likely wrong with the circuit?
Output 5 of a 74138 octal decoder is selected when it is enabled by a data input of:
Which is the decimal number for the BCD number, 10110110?
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?
What is an important attribute of the conditional signal assignment statement?
The IEEE/ANSI symbol for a decoder has the internal designation bcd/dec. This means the decoder is a:
What VHDL techniques are used to describe a priority encoder?
In an AHDL BCD to binary code converter, how is multiplication by 10 accomplished?

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion