MB90520 データシートの表示（PDF） - Fujitsu

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MB90520

16-bit Proprietary Microcontroller

Fujitsu 

MB90520 Series

s HANDLING DEVICES

1. Ensuring that the Voltage does not exceed the Maximum Rating (to Avoid a Latch-up).

In CMOS ICs, a latch-up phenomenon is caused when a voltage exceeding VCC or below VSS is applied to

input or output pins or if a voltage exceeding the rating is applied across VCC and VSS.

When a latch-up is caused, the power supply current may be dramatically increased, resulting in thermal

breakdown of devices. To avoid the latch-up, make sure that the voltage does not exceed the maximum rating.

In turning on/turning off the analog power supply, make sure the analog power voltages (AVCC, AVRH, DVCC)

and analog input voltages do not exceed the digital voltage (VCC).

And also make sure the voltages applied to the LCD power supply pins (V3 to V0) do not exceed the power

supply voltage (VCC).

2. Handling Unused Pins

• Unused input pins left open may cause abnormal operation, or latch-up leading to permanent damage. Unused

input pins should be pulled-up or pull-down through at least 2 kΩ resistance.

• Unused input/output 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. Notes on Using External Clock

In using the external clock, drive X0 pin only and leave X1 pin unconnected.

• Using external clock

Open

X0

MB90520 series

X1

4. Unused Sub Clock Mode

If sub clock modes are not used, the oscillator should be connected to the X0A pin and X1A pin.

5. Power Supply Pins

In products with multiple Vcc or Vss pins, pins with the same potential are internally connected in the device to

avoid abnormal operations including latch-ups. However, the pins should be connected to external powers 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 that a bypass capacitor of around 0.1 µF be placed between the Vcc and Vss pins near the

device.

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