MB90591GPF datasheet(13/60 Pages) FUJITSU

13 / 60 page

MB90590G Series

DS07-13704-6E

■ HANDLING DEVICES

(1) Preventing latch-up

CMOS IC chips may suffer latch-up under the following conditions :

• A voltage higher than Vcc or lower than Vss is applied to an input or output pin.

• A voltage higher than the rated voltage is applied between Vcc and Vss.

• The AVcc power supply is applied before the Vcc voltage.

Latch-up may increase the power supply current drastically, causing thermal damage to the device.

For the same reason, also be careful not to let the analog power-supply voltage (AVCC, AVRH) exceed the digital

power-supply voltage.

(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 pulled up or pulled down through resistors. In this case those resistors should be

more than 2 k

Ω.

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) Using external clock

To use external clock, drive X0 pin only and leave X1 pin unconnected.

Below is a diagram of how to use external clock.

Using external clock

MB90590G Series

MB90591GPF Datasheet(PDF) 13 Page - fujitsu semiconductor