MB90M407 查看數據表（PDF） - Fujitsu

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MB90M407

16-Bit Original Microcontroller

Fujitsu 

MB90M405 Series

■ HANDLING DEVICES

This section contains important information on handling the device, regarding the following :

• Do not exceed maximum rated voltage (to prevent latch-up)

• Supply voltage stability

• Power-on precautions

• Treatment of unused pins

• Treatment of A/D converter power supply pin

• Notes on using external clock

• Power supply pin

• Sequence for applying power analog input of A/D converter

• Output of high-voltage output pin (circuit types C & D)

• Do not exceed maximum rated voltage (to prevent latch-up)

• With a CMOS IC, if voltage above VCC or below VSS is applied to an output or input pin other than a medium/

high voltage resistance pin, or if voltage between VCC and VSS, but exceeding the rated voltage, is applied, a

latch-up state could be generated. In the event of a latch-up, the power current will increase drastically, possibly

destroying the chip due to overheating. For this reason, make sure not to exceed the maximum rating.

• When applying or shutting off analog power, make sure that the analog power (AVCC) and analog input voltage

do not exceed the digital power voltage (VCC) .

• Supply voltage stability

Even within the scope of operational protection for VCC power voltage, a sudden increase in power voltage could

cause the unit to malfunction. For this reason, please stabilize the VCC power voltage.

The standard for stabilizing voltage is a VCC ripple fluctuation (peak to peak value) of no more than 10% of

standard VCC power voltage at commercial power frequencies (50 Hz to 60 Hz) , and an excess fluctuation rate

of no more than 0.1 V/ms for instantaneous changes when switching power.

• Power-on precautions

When turning on the power, ensure that the power voltage (VCC) power-up time is at least 50 µs (0.2 V to

2.7 V) , in order to keep the built-in step-down circuit from malfunctioning.

• Treatment of unused pins

Leaving unused input pins free could cause permanent damage due to malfunctions and latch-ups. For this

reason, set unused input pins to pull-up or pull-down via resistance of 2 kΩ or more. Additionally, if there are

unused I/O pins, either set them to output and leave them free, or set them to input and treat them as input pins.

• Notes on using external clock

When using an external clock, please drive pin X1 only, and free pin X1. An example of using an external clock

is shown in the figure below:

OPEN

X0

MB90M405 series

X1

11

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