For a microcomputer with a pair of Vcc pins and a pair of Vss pins, what will happen if one of each pair becomes open?
• Answer :We consider that there will be no problem from a viewpoint of device capabilities. However, unnecessary radiation may increase, malfunctions may occur due to increase in ground level, and the total output current standards may not be satisfied. The following are described in the data sheet: – If there are two or more Vcc and Vss pins, from a device design viewpoint, the pins that need be at the same potential are connected within the device to prevent malfunctions such as latch-up. Be sure, however, to connect all of these pins externally to the power supply or ground to reduce unnecessary radiation, prevent strobe signal malfunctions caused from increase in ground level, and follow the total output current standards.
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