TMPR4925 datasheet(28/590 Pages) TOSHIBA

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3 General Safety Precautions and Usage Considerations

3-6

3.3

Design

Care must be exercised in the design of electronic equipment to achieve the desired reliability. It

is important not only to adhere to specifications concerning absolute maximum ratings and

recommended operating conditions, it is also important to consider the overall environment in

which equipment will be used, including factors such as the ambient temperature, transient

noise and voltage and current surges, as well as mounting conditions which affect device

reliability. This section describes some general precautions which you should observe when

designing circuits and when mounting devices on printed circuit boards.

For more detailed information about each product family, refer to the relevant individual

technical datasheets available from Toshiba.

3.3.1

Absolute maximum ratings

Do not use devices under conditions in which their absolute maximum

ratings (e.g. current, voltage, power dissipation or temperature) will be

exceeded. A device may break down or its performance may be degraded,

causing it to catch fire or explode resulting in injury to the user.

The absolute maximum ratings are rated values which must not be

exceeded during operation, even for an instant. Although absolute

maximum ratings differ from product to product, they essentially

concern the voltage and current at each pin, the allowable power

dissipation, and the junction and storage temperatures.

If the voltage or current on any pin exceeds the absolute maximum

rating, the device’s internal circuitry can become degraded. In the worst case, heat generated in

internal circuitry can fuse wiring or cause the semiconductor chip to break down.

If storage or operating temperatures exceed rated values, the package seal can deteriorate or the

wires can become disconnected due to the differences between the thermal expansion coefficients

of the materials from which the device is constructed.

3.3.2

Recommended operating conditions

The recommended operating conditions for each device are those necessary to guarantee that the

device will operate as specified in the datasheet.

If greater reliability is required, derate the device’s absolute maximum ratings for voltage,

current, power and temperature before using it.

3.3.3

Derating

When incorporating a device into your design, reduce its rated absolute maximum voltage,

current, power dissipation and operating temperature in order to ensure high reliability.

Since derating differs from application to application, refer to the technical datasheets available

for the various devices used in your design.

3.3.4

Unused pins

If unused pins are left open, some devices can exhibit input instability problems, resulting in

malfunctions such as abrupt increase in current flow. Similarly, if the unused output pins on a

device are connected to the power supply pin, the ground pin or to other output pins, the IC may

malfunction or break down.

Since the details regarding the handling of unused pins differ from device to device and from pin

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