MB90440G データシートの表示（PDF） - Fujitsu
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MB90440G Datasheet PDF : 61 Pages
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MB90440G Series
s HANDLING DEVICES
1. Preventing Latch-up
CMOS IC chips may suffer latch-up under the following conditions :
(1) A voltage higher than VCC or lower than VSS is applied to an input or output pin.
(2) A voltage higher than the rated voltage is applied to between VCC and Vss.
(3) The AVCC power supply is applied before the VCC voltage.
Latch-up may increase the power supply current drastically, causing thermal damage to the device.
Always take sufficient precautions in using semiconductor devices to avoid this possibility.
Also be careful not to let the analog power-supply voltage (AVCC, AVRH) exceed the digital power-supply voltage
(VCC) when the analog system power-supply is turned on and off.
2. Handling Unused Input Pins
Do not leave unused input pins open, as doing so may cause misoperation of the device or latch-up leading to
permanent damage. Unused input pins should be pulled up or pulled down through at least 2 kΩ resistance.
Unused I/O pins may be left open in output state, but if such pins are in input state they should be handled in
the same way as input pins.
3. Use of the External Clock
To use the external clock, drive only the X0 pin and leave the X1 pin open.
A diagram of how to use an external clock is shown below.
open
MB90440G Series
X0
X1
4. Precautions for when not using a Sub Clock Signal
If the X0A and X1A pins are not connected to an oscillator, apply pull-down treatment to the X0A pin and leave
the X1A pin open.
5. Power Supply Pins (VCC/VSS)
In products with multiple VCC or VSS pins, the pins of a same potential are internally connected in the device to
avoid abnormal operations including latch-up. However, connect the pins external power and ground lines 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 current rating.
Make sure to connect VCC and VSS pins via lowest impedance to power lines.
It is recommended to provide a bypass capacitor of around 0.1 µF between VCC and VSS pins near the device.
VCC
VSS
VSS
VCC
MB90440G
VCC
Series
VSS
VCC
VSS
VCC
VSS
15
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