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MB90800 Datasheet(PDF) 14 Page - fujitsu semiconductor |
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MB90800 Datasheet(HTML) 14 Page - fujitsu semiconductor |
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14 / 92 page  MB90800 Series 14 DS07-13733-6E ■ HANDLING DEVICES 1. Preventing Latch-up, Turning on Power Supply Latch-up may occur on CMOS IC under the following conditions: • If a voltage higher than VCC or lower than VSS is applied to input and output pins, • A voltage higher than the rated voltage is applied between VCC pin and VSS pin. • If the AVCC power supply is turned on before the VCC voltage. Ensure that you apply a voltage to the analog power supply at the same time as VCC or after you turn on the digital power supply (when you perform power-off, turn off the analog power supply first or at the same time as VCC and the digital power supply). When latch-up occurs, power supply current increases rapidly and might thermally damage elements. When using CMOS IC, take great care to prevent the occurrence of latch-up. 2. Treatment of unused pins If unused input pins are left open, they may cause abnormal operation or latch-up which may lead to permanent damage to the semiconductor. Any such pins should be pulled up or pulled down through resistance of at least 2 k Ω. Any unused input/output pins should be left open in output status, or if found set to input status, they should be treated in the same way as input pins. Any unused output pins should be left open. 3. Treatment of A/D converter power supply pins Even if the A/D converter is not used, pins should be connected so that AVCC = VCC, and AVSS = VSS. 4. About the attention when the external clock is used In using an external clock, drive pin X0 only and leave pin X1 open. The example of using an external clock is shown below. Please set X0A = GND and X1A = open without subclock mode. The following figure shows the using sample. X0 X1 OPEN MB90800 Series X0A X1A OPEN MB90800 Series |
Similar Part No. - MB90800_09 |
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Similar Description - MB90800_09 |
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