MB89656AR FUJITSU [Fujitsu Component Limited.], MB89656AR Datasheet - Page 14

• Manufacturer Part Number: MB89656AR
• Description: 8-bit Proprietary Microcontroller
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

14
MB89650AR Series
1. Preventing Latchup
2. Treatment of Unused Input Pins
3. Treatment of Power Supply Pins on Microcontrollers with A/D and D/A Converters
4. Treatment of N.C. Pins
5. Power Supply Voltage Fluctuations
6. Precautions when Using an External Clock
HANDLING DEVICES
Latchup may occur on CMOS ICs if voltage higher than V
other than medium- to high-voltage pins or if higher than the voltage which shows on “1. Absolute Maximum
Ratings” in section “ Electrical Characteristics” is applied between V
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 (AV
power supply (V
Leaving unused input pins open could cause malfunctions. They should be connected to a pull-up or pull-down
resistor.
Connect to be AV
Be sure to leave (internally connected) N.C. pins open.
Although V
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 V
value) will be less than 10% of the standard V
fluctuation rate will be less than 0.1 V/ms at the time of a momentary fluctuation such as when power is switched.
Even when an external clock is used, oscillation stabilization time is required for power-on reset (optional) and
wake-up from stop mode.
CC
power supply voltage is assured to operate within the rated range, a rapid fluctuation of the voltage
CC
CC
) when the analog system power supply is turned on and off.
= DAVC = V
CC
and AV
SS
CC
= AVR = V
value at the commercial frequency (50 to 60 Hz) and the transient
CC
SS
CC
and AVR) and analog input from exceeding the digital
even if the A/D and D/A converters are not in use.
or lower than V
CC
and V
SS
is applied to input and output pins
SS
.
CC
ripple fluctuations (P-P