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參數(shù)資料
| 型號： | MB90P553APF |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁數(shù)： | 7/61頁 |
| 文件大小： | 687K |
| 代理商： | MB90P553APF |
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MB90550A/550B Series
15
s 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.
If latchup occurs, the power supply current increases rapidly, sometimes resulting in thermal breakdown of the
device. Use meticulous care not to let it occur.
For the same reason, also be careful not to let the analog power-supply voltage exceed the digital power-supply
voltage.
2.
Handling unused input pins
Leaving unused input pins open may cause a malfunction or latch-up which leads to fatal damage to the device.
Therefore they must be pulled up or pulled down through at least 2 k
resistance. Also, unused input/output
pins should be left open in output state or handled in the same way as unused input pins.
3.
Notes on Using External Clock
In using the external clock, drive X0 pin only and leave X1 pin unconnected.
4.
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, the pins should be connected to external power and
ground lines to lower the electro-magnetic emission level and 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
F be placed between the VCC and VSS pins near the
device.
Using external clock
MB90550A/550B series
X0
X1
Open
VCC
VSS
Using power supply pins
MB90550A/550B
series
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