MB90347CE datasheet(24/85 Pages) FUJITSU

24 / 85 page

MB90340E Series

■ HANDLING DEVICES

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 pins.

•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.

Handling unused pins

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

device. Therefore 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.

Power supply pins (VCC/VSS)

• If there are multiple VCC and VSS pins, that are designed to be set to the same potential are connected the

inside of the device to prevent malfunctions such as latch-up.

To reduce unnecessary radiation, prevent malfunctioning of the strobe signal due to the rise of ground level,

and observe the standard for total output current, be sure to connect the VCC and VSS pins to the power supply

and ground externally. Connect VCC and VSS pins to the device from the current supply source at a low imped-

ance.

• As a measure against power supply noise, connect a capacitor of about 0.1

µF as a bypass capacitor between

VCC and VSS pins in the vicinity of VCC and VSS pins of the device

Mode Pins (MD0 to MD2)

Connect the mode pins directly to VCC or VSS pins. To prevent the device unintentionally entering test mode due

to noise, lay out the printed circuit board so as to minimize the distance from the mode pins to VCC or VSS pins

and to provide a low-impedance connection.

Vcc

Vss

Vcc

Vss

Vcc

MB90340E

Series

Vcc

Vss

Vcc

Vss

MB90347CE Datasheet(PDF) 24 Page - fujitsu semiconductor

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