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MB90330A Datasheet(PDF) 15 Page - Fujitsu Component Limited.

Part # MB90330A
Description  16-bit Microcontroller
Download  120 Pages
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Manufacturer  FUJITSU [Fujitsu Component Limited.]
Direct Link  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB90330A Datasheet(HTML) 15 Page - Fujitsu Component Limited.

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MB90330A Series
15
■ HANDLING DEVICES
1.
Preventing latch-up and turning on power supply
Latch
-up may occur on CMOS IC under the following conditions:
• If a voltage higher than VCC or lower than VSS is applied to input and output pins.
• A voltage higher than the rated voltage is applied between VCC pin and VSS pin.
• If the AVCC power supply is turned on before the VCC voltage.
Ensure that you apply a voltage to the analog power supply at the same time as VCC or after you turn on the
digital power supply (when you perform power-off, turn off the analog power supply first or at the same time as
VCC and the digital power supply).
If latch-up occurs, the supply current increases rapidly, sometimes resulting in thermal breakdown of the device.
Use meticulous care not to let any voltage exceed the maximum rating.
2.
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 k
Ω. 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.
3.
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 AVCC
= AVRH = VCC,
and AVSS
= VSS.
4.
About the attention when the external clock is used
Even when using an external clock signal, an oscillation stabilization delay is applied after a power-on reset or
when recovering from sub clock or stop mode. When suing an external clock, 25 MHz should be the upper
frequency limit.
The following figure shows a sample use of external clock signals.
5.
Treatment of power supply pins (VCC/VSS)
In products with multiple VCC or VSS pins, the pins of the same potential are internally connected in the 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 VCC and VSS pins of this device at the low impedance.
It is also advisable to connect a ceramic bypass capacitor of approximately 0.1
µF between VCC pin and VSS pin
near this device.
X0
X1
OPEN
• Using external clock


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