MB90570A 데이터 시트보기 (PDF) - Fujitsu

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MB90570A

16-bit Proprietary Microcontroller

Fujitsu 

MB90570A/570C Series

■ HANDLING DEVICES

1. Preventing Latchup

CMOS ICs may cause latchup in the following situations:

• When a voltage higher than Vcc or lower than Vss is applied to input or output pins.

• When a voltage exceeding the rating is applied between Vcc and Vss.

• When AVcc power is supplied prior to the Vcc voltage.

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

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

2. Treatment of unused pins

Leaving unused input pins open may result in misbehavior or latch up and possible permanent damage of the

device. Therefor they must be tied to VCC or Ground through resistors. In this case those resistors should be

more than 2 kΩ.

Unused bidirectional pins should be set to the output state and can be left open, or the input state with the above

described connection.

3. Notes on Using External Clock

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

• Using external clock

MB90570A/570C series

X0

Open

X1

4. Unused Sub Clock Mode

If sub clock modes are not used, the oscillator should be connected to the X01A pin and X1A pin

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.

16

DS07-13701-9E

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