FUJITSU F2MCTM-16LX - Manual (Page 37)

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CHAPTER 1 OVERVIEW
1.7 Handling Device
This section explains notes on handling the MB90360 series.
■ Handling the Device
●
Preventing latch-up
CMOS IC chips may suffer latch-up under the following conditions:
• A voltage higher than V
CC
or lower than V
SS
is applied to an input or output pin.
• A voltage higher than the rated voltage is applied between V
CC
and V
SS
.
• The AV
CC
power supply is applied before the V
CC
voltage.
Latch-up may increase the power supply current drastically, causing thermal damage to the device.
When used, note that maximum rated voltage is not exceeded.
For the same reason, also be careful not to let the analog power-supply voltage (AV
CC,
AVR) exceed the
digital power-supply voltage.
●
Treatment of unused pins
Leaving unused input pins open may result in misbehavior or latch up and possible permanent damage of
the device. Therefore, they must be pulled up or pulled down through resistors. In this case those resistors
should be more than 2 k
Ω.
Unused bidirectional pins should be set to the output state and can be left open, or the input state with the
above described connection.