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參數(shù)資料
| 型號： | MB91V280CR |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 32 MHz, RISC MICROCONTROLLER, CPGA401 |
| 封裝： | CERAMIC, PGA-401 |
| 文件頁數(shù)： | 18/85頁 |
| 文件大小： | 1090K |
| 代理商： | MB91V280CR |
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MB91270/280 Series
25
■ HANDLING DEVICES
Preventing Latch-up
Latch-up may occur in a CMOS IC if a voltage greater than VCC or less than VSS is applied to an input or output
pin or if an above-rating voltage is applied between VCC pin and VSS pin. A latch-up, if it occurs, significantly
increases the power supply current and may cause thermal destruction of an element. When you use a CMOS
IC, do not exceed the maximum rating.
Treatment of Unused Pins
Do not leave an unused input pin open, since it may cause a malfunction. Handle by, for example, using a pull-
up or pull-down resistor.
About Power Supply Pins
In products with multiple VCC or VSS pins, the pins of the same potential are internally connected in the device
to avoid abnormal operations including latch-up. However, you must connect the pins to external power supply
and a ground line 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 output current rating.
Moreover, connect the current supply source with the VCC and VSS pins of this device at the low impedance.
It is also advisable to connect a ceramic bypass capacitor of approximately 0.1
F between VCC and VSS near
this device.
About Crystal Oscillator Circuit
Noise near the X0, X1, X0A and X1A pins may cause the device to malfunction. Design the printed circuit board
so that X0, X1, X0A and X1A the crystal oscillator (or ceramic oscillator), and the bypass capacitor to ground
are located as close to the device as possible.
It is strongly recommended to design the PC board artwork with the X0, X1, X0A and X1A pins surrounded by
ground plane because stable operation can be expected with such a layout.
Please ask the crystal maker to evaluate the oscillational characteristics of the crystal and this device.
Notes on Using External Clock
When external clock is selected, supply it to X0 pin generally, and simultaneously the opposite phase clock to
X0 must be supplied to X1 pin. However, in this case the stop mode (oscillation stop mode) must not be used.
(This is because the X1 pin stops at High level output in STOP mode.)
Note : The STOP mode (oscillation stop mode) cannot be used.
Notes when using no sub-clock
Use a single-clock model if not using the sub-clock.
X0
X1
Using an external clock (normal)
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