MB89990 Ver la hoja de datos (PDF) - Fujitsu

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componentes Descripción

Fabricante

MB89990

8-bit Proprietary Microcontroller

Fujitsu 

MB89990 Series

s HANDLING DEVICES

1. Preventing Latch-up

Latchup may occur on CMOS ICs if voltage higher than VCC or lower than VSS is applied to input or output pins

other than medium-to high-voltage pins or if higher than the voltage which shows on “ 1. Absolute Maximum

Ratings” in “s Electrical Characteristics” is applied between VCC to VSS.

When latchup occurs, power supply current increases rapidly and might thermally damage elements. When

using, take great care not to exceed the absolute maximum ratings.

2. Treatment of Unused Input Pins

Leaving unused input pins open could cause malfunctions. They should be connected to pull-up or pull-down

resistor.

3. Treatment of N.C. Pins

Be sure to leave (internally connected) N.C. pins open.

4. Power Supply Voltage Fluctuations

Although VCC power supply voltage is assured to operate within the rated range, a rapid fluctuation of the voltage

could cause malfunctions, even if it occurs within the rated range. Stabilizing voltage supplied to the IC is

therefore important. As stabilization guidelines, it is recommended to control power so that VCC ripple fluctuations

(P-P value) will be less than 10% of the standard VCC value at the commercial frequency (50 to 60 Hz) and the

transient fluctuation rate will be less than 0.1 V/ms at the time of a momentary fluctuation such as when power

is switched.

5. Precautions when Using an External Clock

When an external clock is used, oscillation stabilization time is required even for power-on reset (option selection)

and release from stop mode.

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