tmpr4937 TOSHIBA Semiconductor CORPORATION, tmpr4937 Datasheet - Page 25
tmpr4937
Manufacturer Part Number
tmpr4937
Description
64-bit Tx System Risc
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMPR4937.pdf
(552 pages)
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3.1.2
Handle devices and packaging materials with care. To avoid damage to devices,
do not toss or drop packages. Ensure that devices are not subjected to
mechanical vibration or shock during transportation. Ceramic package devices
and devices in canister-type packages which have empty space inside them are
subject to damage from vibration and shock because the bonding wires are
secured only at their ends.
Plastic molded devices, on the other hand, have a relatively high level of
resistance to vibration and mechanical shock because their bonding wires are
enveloped and fixed in resin. However, when any device or package type is installed in target equipment, it is to
some extent susceptible to wiring disconnections and other damage from vibration, shock and stressed solder
junctions. Therefore when devices are incorporated into the design of equipment which will be subject to
vibration, the structural design of the equipment must be thought out carefully.
If a device is subjected to especially strong vibration, mechanical shock or stress, the package or the chip itself
may crack. In products such as CCDs which incorporate window glass, this could cause surface flaws in the
glass or cause the connection between the glass and the ceramic to separate.
Furthermore, it is known that stress applied to a semiconductor device through the package changes the
resistance characteristics of the chip because of piezoelectric effects. In analog circuit design attention must be
paid to the problem of package stress as well as to the dangers of vibration and shock as described above.
•
•
•
•
•
•
When storing printed circuit boards which have devices mounted on them, use a board container or bag that is
protected against static charge. To avoid the occurrence of static charge or discharge due to friction, keep the
boards separate from one other and do not stack them directly on top of one another.
Ensure, if possible, that any articles (such as clipboards) which are brought to any location where the level of
static electricity must be closely controlled are constructed of anti-static materials.
In cases where the human body comes into direct contact with a device, be sure to wear anti-static finger
covers or gloves (suggested resistance value: 10
Equipment safety covers installed near devices should have resistance ratings of 10
If a wrist strap cannot be used for some reason, and there is a possibility of imparting friction to devices, use
an ionizer.
The transport film used in TCP products is manufactured from materials in which static charges tend to build
up. When using these products, install an ionizer to prevent the film from being charged with static electricity.
Also, ensure that no static electricity will be applied to the product’s copper foils by taking measures to
prevent static occuring in the peripheral equipment.
Vibration, impact and stress
3 General Safety Precautions and Usage Considerations
8
3-3
Ω or less).
Vibration
9
Ω or less.
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