Home » Digital Electronics » 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?

1010
0101
1101
1011

Correct Answer: 1010

← Previous Question Next Question→

More Questions from MSI Logic Circuits

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?
Refer to the display multiplexer given below. The MSD display is blank, while the LSD seems to be OK. The input and output lines to the 74157 and 7449 are checked with a scope and can be seen changing levels. The A input on the 74139 also changes; however, the 0 output on the 74139 is always LOW and the 1 output is always HIGH. The B and EN inputs on the 74139 are always LOW. What could cause the problem and what should be done to correct it?

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion