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The 74139 dual four-line demultiplexer functions a...
1.
The 74139 dual four-line demultiplexer functions as a demultiplexer if data input is on the line.
A.
True
B.
False
Answer» B. False
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The circuit in Figure 9-8 is defective; data is not appearing on the output lines. A check with the scope shows data pulses on the serial data line and multiplex control lines, S0–S2; no parity error is indicated. A further check with a logic probe indicates that and ground appear to be present. What might be wrong with the circuit?
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