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參數(shù)資料
| 型號： | MB91487PMC-GE1 |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, MROM, 80 MHz, RISC MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 14 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 19/96頁 |
| 文件大小： | 2461K |
| 代理商： | MB91487PMC-GE1 |
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MB91470/480 Series
26
DS07–16901–9E
■ HANDLING DEVICES
Preventing latch-up
Latch-up phenomenon may occur with CMOS IC, when a voltage higher than VCC or lower than VSS is applied
to either the input or output terminals, or when a voltage is applied between VCC pin and VSS pin that
exceeds the rated voltage. When latch-up occurs, a significant power-supply current surge results, which
may damage some elements due to the excess heat, so great care must be taken to ensure that the maximum
rating is never exceeded during use.
Treatment of unused input 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.
Power pins
In products with multiple VCC and 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 the same potential
power supply and a ground line externally 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 capacitor of approximately 0.1
μF as a bypass capacitor between VCC
and VSS near this device.
Crystal oscillator circuit
Noise near the X0 and X1 pins may cause the device to malfunction. Design the printed circuit board so that
X0,X1, 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 and X1pins surrounded by ground
plane because stable operation can be expected with such a layout. Please ask the crystal maker to eval-
uate the oscillational characteristics of the crystal and this device.
About mode pins (MD0 to MD2)
These pins should be connected directly to VCC pin or VSS pin.
Design the printed circuit board such that the pull-up/down resistance stays low, as well as the distance
between the mode pins and power supply or GND pins is as short as possible and the connection impedance
is low, when the pins are pulled-up/down such as for switching the pin level and rewriting the Flash memory
data. It is because of preventing the device erroneously switching to test mode due to noise.
Operation at start-up
Be sure to execute setting initialized reset (INIT) with INITX pin immediately after start-up.
Immediately after that, also, hold the "L"-level input to the INITX pin for the stabilization wait time required
for the oscillator circuit to take the oscillation stabilization wait time for the oscillator circuit and the stabiliza-
tion wait time for the regulator (For INIT via the INITX pin, the oscillation stabilization wait time setting is
initialized to the minimum value).
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