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MB90378 Datasheet(PDF) 16 Page - Fujitsu Component Limited.

Part No. MB90378
Description  16-bit Proprietary Microcontroller
Download  65 Pages
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Maker  FUJITSU [Fujitsu Component Limited.]
Homepage  http://edevice.fujitsu.com/fmd/en/index.html
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MB90378 Datasheet(HTML) 16 Page - Fujitsu Component Limited.

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MB90378 Series
16
■ HANDLING DEVICES
1.
Be sure that the maximum rated voltage is not exceeded (latch-up prevention).
A latch-up may occur on a CMOS IC if a voltage higher than VCC or lower than VSS is applied to an input or output
pin other than medium-to-high voltage pins. A latch-up may also occur if a voltage higher than the rating is
applied between VCC pin and VSS pin. A latch-up causes a rapid increase in the power supply current, which can
result in thermal damage to an element. Take utmost care that the maximum rated voltage is not exceeded.
When turning the power on or off to analog circuits, be sure that the analog supply voltages (AVCC, AVR) and
analog input voltage do not exceed the digital supply voltage (VCC).
2.
Stabilize the supply voltages
Even within the operation guarantee range of the VCC supply voltage, a malfunction can be caused if the supply
voltage undergoes a rapid change. For voltage stabilization guidelines, the VCC ripple fluctuations (P-P value)
at commercial frequencies (50 Hz to 60 Hz) should be suppressed to "10%" or less of the reference VCC value.
During a momentary change such as when switching a supply voltage, voltage fluctuations should also be
suppressed so that the "transient fluctuation rate" is 0.1 V/ms or less.
3.
Power-on
To prevent a malfunction in the built-in voltage drop circuit, secure "50
µs (between 0.2 V and 1.8 V)" or more
for the voltage rise time during power-on.
4.
Treatment of unused input pins
An unused input pin may cause a malfunction if it is left open. Every unused input pin should be pulled up or down.
5.
Treatment of A/D converter, and D/A converter power pin
When the A/D converter, D/A converter and comparator is not used, connect the pins as follows: AVCC
= VCC,
AVSS
= AVR = VSS.
6.
Notes on external clock
When an external clock is used, the oscillation stabilization wait time is required at power-on reset or at cancel-
lation of sub-clock mode or stop mode. As shown in diagram below, when an external clock is used, connect
only the X0 pin and leave the X1 pin open.
Open
X1
X0
MB90378 series


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