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參數(shù)資料
| 型號(hào)： | MB91V301A |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 68 MHz, RISC MICROCONTROLLER, CPGA179 |
| 封裝： | CERAMIC, PGA-179 |
| 文件頁(yè)數(shù)： | 57/140頁(yè) |
| 文件大?。?/td> | 2841K |
| 代理商： | MB91V301A |
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MB91301 Series
DS07-16502-4E
23
Preventing Latchup
When CMOS integrated circuit devices are subjected to applied voltages higher than VCC at input and output
pins, or to voltages lower than VSS, as well as when voltages in excess of rated levels are applied between VCC
and VSS, a phenomenon known as latchup can occur. When a latchup condition occurs, the supply current can
increase dramatically and may destroy semiconductor elements. In using semiconductor devices, always take
sufficient care to avoid exceeding maximum ratings.
Power supply pins
Devices with multiple VCC and VSS supply pins are designed to prevent problems such as latchup occurring by
providing internal connections between pins at the same potential. However, in order to reduce unwanted
radiation, prevent abnormal operation of strobe signals due to a rise in ground level, and to maintain the total
output current ratings, all such pins should always be connected externally to power supply or ground. Also,
ensure that the impedance of the VCC and VSS connections to the power supply are as low as possible.
In addition, it is recommended that a bypass capacitor of approximately 0.1
F be connected between VCC and
VSS. Connect the capacitor close to the VCC and VSS pins.
Crystal oscillators
Noise in proximity to the X0 and X1 pins can cause abnormal operation in this device. Printed circuit boards
should be designed so that the X0 and X1 pins, crystal (or ceramic) oscillator, and bypass capacitor connected
to ground are placed as close together as possible.
Also, to ensure stable operation, it is strongly recommended that the printed circuit board art work be designed
such that the X0 and X1 pins are surrounded by ground.
Please ask the crystal maker to evaluate the oscillational characteristics of the crystal and this device.
Treatment of NC and OPEN pins
Pins marked as "NC" or "OPEN" must be left open-circuit.
Treatment of unused input pins
If unused input pins are left open, abnormal operation may result. Any unused input pins should be connected
to pull-up or pull-down resistors.
Mode pins (MD0 to MD2)
These pins should be connected directly to VCC or VSS. To prevent the device erroneously switching to test mode
due to noise, design the printed circuit board such that the distance between the mode pins and VCC or VSS is
as short as possible and the connection impedance is low.
Remarks for External Clock Operation
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 must not be used (because X1 pin stops
at “H” output in stop mode) .
When operating at 12.5 MHz or less, the microcontroller can be used with the clock signal supplied only to pin X0.
“Using an external clock (normal) and (12.5 MHz) ” shows examples of how the MB91301 uses the external clock.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB91V301A-RDK01 | 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:32-Bit Proprietary Microcontroller |
| MB91V307RCR | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-Bit Microcontroller |
| MB91V350A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-Bit Proprietary Microcontroller |
| MB91V650 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontrollers |
| MB-920 | 制造商:Maxxtro 功能描述: |
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