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| 型號(hào)： | MB91340PMT |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, MROM, 66 MHz, RISC MICROCONTROLLER, PQFP176 |
| 封裝： | PLASTIC, LQFP-176 |
| 文件頁(yè)數(shù)： | 44/126頁(yè) |
| 文件大小： | 1501K |
| 代理商： | MB91340PMT |
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MB91340/MB91V340
24
s HANDLING DEVICES
Preventing Latchup
When CMOS integrated circuit devices are subjected to applied voltages higher than VCC3 at input and output
pins, or to voltages lower than VSS, as well as when voltages in excess of rated levels are applied between VCC3,
VCC2 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.
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.
Power supply pins
Devices with multiple VCC3, VCC2 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 VCC3, VCC2 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.
Treatment of NC and OPEN pins
Pins marked as "NC" or "OPEN" must be left open-circuit.
Mode pins (MD0 to MD2)
These pins should be connected directly to VCC3 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 VCC3 or VSS is
as short as possible and the connection impedance is low.
Operation at startup
Always apply a settings initialization (INIT) to the INIT pin immediately after turning on the power.
Also, in order to provide a delay while the oscillator circuits stabilize immediately after startup, maintain the "L"
level input to the INIT pin for the required stabilization delay time. (The initialization processing (INIT) triggered
by the INIT pin initializes the oscillation stabilization delay time to the minimum setting.)
Source oscillation input at startup
At power-on startup, always input a clock signal until the oscillation stabilization delay time is ended.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB91350A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-Bit Proprietary Microcontroller |
| MB91350A_07 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontroller |
| MB91351A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontroller |
| MB91351APMT | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontroller |
| MB91352A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontroller |
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