MB95F856K datasheet(28/172 Pages) CYPRESS

28 / 172 page

Document Number: 002-09305 Rev. *C

Page 28 of 172

PRELIMINARY

MB95F856K, MB95F866K,

MB95F876K

7.3 Precautions for Use Environment

Reliability of semiconductor devices depends on ambient temperature and other conditions as described above.

For reliable performance, do the following:

❐ Humidity: Prolonged use in high humidity can lead to leakage in devices as well as printed circuit boards. If high humidity levels

are anticipated, consider anti-humidity processing.

❐ Discharge of Static Electricity: When high-voltage charges exist close to semiconductor devices, discharges can cause abnormal

operation. In such cases, use anti-static measures or processing to prevent discharges.

❐ Corrosive Gases, Dust, or Oil: Exposure to corrosive gases or contact with dust or oil may lead to chemical reactions that will

adversely affect the device. If you use devices in such conditions, consider ways to prevent such exposure or to protect the devices.

❐ Radiation, Including Cosmic Radiation: Most devices are not designed for environments involving exposure to radiation or cosmic

radiation. Users should provide shielding as appropriate.

❐ Smoke, Flame:

Caution: Plastic molded devices are flammable, and therefore should not be used near combustible substances. If devices begin to

smoke or burn, there is danger of the release of toxic gases.

Customers considering the use of Cypress products in other special environmental conditions should consult with sales representa-

tives.

8. Notes on Device Handling

■ Preventing latch-ups

When using the device, ensure that the voltage applied does not exceed the maximum voltage rating.

In a CMOS IC, if a voltage higher than VCC or a voltage lower than VSS is applied to an input/output pin that is neither a

medium-withstand voltage pin nor a high-withstand voltage pin, or if a voltage out of the rating range of power supply voltage mentioned

in “Absolute Maximum Ratings” of Electrical Characteristics on page 135 is applied to the VCC pin or the VSS pin, a latch-up may occur.

When a latch-up occurs, power supply current increases significantly, which may cause a component to be thermally destroyed.

■ Stabilizing supply voltage

Supply voltage must be stabilized.

A malfunction may occur when power supply voltage fluctuates rapidly even though the fluctuation is within the guaranteed operating

range of the VCC power supply voltage.

As a rule of voltage stabilization, suppress voltage fluctuation so that the fluctuation in VCC ripple (p-p value) at the commercial

frequency (50 Hz/60 Hz) does not exceed 10% of the standard VCC value, and the transient fluctuation rate does not exceed 0.1 V/ms

at a momentary fluctuation such as switching the power supply.

■ Notes on using the external clock

When an external clock is used, oscillation stabilization wait time is required for power-on reset, wake-up from subclock mode or stop

mode.

MB95F856K Datasheet(PDF) 28 Page - Cypress Semiconductor