Handling Of Device - Fujitsu F2MC-16LX Hardware Manual

1.7

Handling of Device

This section describes the precautions when handling devices.
Precautions when Handling Devices
Preventing Latch-up, Turning on Power Supply
Latch-up may occur on CMOS IC under the following conditions:
• If a voltage higher than V
• If a voltage higher than the rated voltage is applied between V
• If the AV
Ensure that you apply a voltage to the analog power supply at the same time as V
digital power supply (when you perform power-off, turn off the analog power supply first or at the same
time as V
When latch-up occurs, power supply current increases rapidly and might thermally damage elements. When
using CMOS IC, take great care to prevent the occurrence of latch-up.
Treatment of Unused Pins
Leaving unused input pins unconnected can cause abnormal operation or latch-up, leading to permanent
damage.
Unused input pins should always be pulled up or down through resistance of at least 2 kΩ. Any unused
input/output pins may be set to output mode and left open, or set to input mode and treated the same as
unused input pins. If there is unused output pin, make it to open.
Treatment of Power Supply Pins on Models with A/D Converters
Even when the A/D converters are not in use, be sure to make the necessary connections AV
V and AV
CC
Treatment of Power Supply Pins (V
In products with multiple V
device to avoid abnormal operations including latch-up. However, you must connect the pins to external
power supply and a ground line to lower the electro-magnetic emission level, to prevent abnormal
operation of strobe signals caused by the rise in the ground level, and to conform to the total output current
rating.
Moreover, connect the current supply source with the V
impedance.
It is also advisable to connect a ceramic bypass capacitor of approximately 0.1 µF between V
near this device.
or lower than V
CC
power supply is turned on before the V
CC
and the digital power supply).
CC
= V .
SS SS
CC
or V
CC
is applied to input and output pins,
SS
voltage.
CC
/V )
SS
pins, the pins of the same potential are internally connected in the
SS
CC
CHAPTER 1 OVERVIEW
pin to V pin,
CC SS
or after you turn on the
CC
and V pins of this device at the low
SS
= AVRH =
CC
and V
CC SS
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