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Digital Electronics - MSI Logic Circuits - Discussion

Discussion Forum : MSI Logic Circuits - General Questions (Q.No. 3)
MSI Logic Circuits
3.

Refer to the figure given below. The logic function generator being implemented with the multiplexer in this circuit produces a constant LOW on the output. The ABC inputs are checked and appear to be pulsing; also, the 0–7 and EN inputs are checked with the scope and all appear to be at 0 V. A check with the DMM confirms that power is on. What is the problem, and what should be done to correct it?

The output is shorted to Vcc; replace the IC.
The scope's vertical input is in the AC mode and the common connection for the 0,2,3 and 5 inputs is bad. Set the scope's vertical input mode to DC, and repair the bad solder connection.
Power has not been applied to the circuit; apply power.
The output is shorted to ground; replace the IC.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
2 comments Page 1 of 1.
Anbu said:   10 years ago
Enable Pin is grounded. It need to be Vcc.
Mounika said:   5 years ago
Could you explain the answer, please?
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