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MB89146 Datasheet(PDF) 11 Page - Fujitsu Component Limited. |
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MB89146 Datasheet(HTML) 11 Page - Fujitsu Component Limited. |
11 / 38 page 11 MB89143A/144A s HANDLING DEVICES 1. Preventing Latchup Latchup may occur on CMOS ICs if voltage higher than VCC or lower than VSS is applied to input and output pins other than medium- to high-voltage pins or if higher than the voltage which shows on “1. Absolute Maximum Ratings” in section “s Electrical Characteristics” is applied between VCC and VSS. (However, up to 7.0 V can be applied to P31/INT1 pin, regardless of VCC.) 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. Also, take care to prevent the analog power supply (AVR) and analog input from exceeding the digital power supply (VCC) when the analog system power supply is turned on and off. 2. Treatment of Unused Input Pins Leaving unused input pins open could cause malfunctions. They should be connected to a pull-up or pull-down resistor. 3. Treatment of Power Supply Pins on Microcontrollers with A/D and D/A Converters Connect to be AVSS = AVR = VSS even if the A/D and D/A converters are not in use. 4. Treatment of N.C. Pins Be sure to leave (internally connected) N.C. pins open. 5. 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. 6. Precautions when Using an External Clock Even when an external clock is used, oscillation stabilization time is required for power-on reset and wake-up from stop mode. |
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