Fujitsu MB91191 Manual Do Utilizador
18
CHAPTER 2 Handling Devices
2.1
Precautions When Handling Devices
The semiconductor device breaks down at a certain probability. Moreover, the failure of
the semiconductor device is greatly controlled by the condition (circuit condition and
environmental condition, etc.) used.
To have the high use, the semiconductor device is explained about reliability about the
matter which should be noted and considered as follows.
the semiconductor device is greatly controlled by the condition (circuit condition and
environmental condition, etc.) used.
To have the high use, the semiconductor device is explained about reliability about the
matter which should be noted and considered as follows.
■
Precautions when Designing
Here, the matter which should be noted when an electronic equipment is designed with a semiconductor
device is described.
●
Observance of absolute maximum rating
When an excessive stress (voltage, current, and temperature, etc.) adds, the semiconductor device has the
possibility to destroy. The value that this threshold was provided is an absolute maximum rating. Therefore,
care must be taken not to exceed the rating even for one item.
●
Observance of recommended operation condition
The recommended operation condition is a condition to guarantee normal movement of the semiconductor
device. All standard values for electric features are assured within this condition range. Always use under
the recommended operation condition. When this condition is exceeded and used, the adverse effect is
occasionally caused for reliability.
Use by the item, the condition, and the logical combination not described to this material is not guaranteed.
Please consult with the section in charge of sales of our company about use by conditions other than being
described for the idea beforehand.
●
Processing and protection of terminal
In the semiconductor device, there are a power supply and various input/output terminals. The following
attention is necessary for these.
•
Prevention of over-voltage/over-current
Deterioration is caused in the device when the voltage/current which exceeds the maximum rating is
applied to each terminal, and when it is remarkable, it becomes destruction. Please prevent such an over-
voltage/over-current occurring when you design the equipment.
•
Protection of output terminal
If the output terminal is short circuited with the power terminal or other output terminal, or when large
capacity load is connected, a large electrical current may result. If this condition is prolonged, the device
will be damaged, so this kind of connection should not be made.
•
Processing of unused input terminal
If the input terminal with very high impedance is used while opened, the operation might become unstable.
Ensure connections to the power terminal and ground terminal have the appropriate resistance.