參數(shù)資料
型號： MB91461PMC-GSE1
元件分類： 微控制器/微處理器
英文描述： RISC MICROCONTROLLER, PQFP176
封裝： 24 X 24 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, PLASTIC, LQFP-176
文件頁數(shù)： 5/84頁
文件大小： 2114K
代理商： MB91461PMC-GSE1
MB91460 Series
DS07-16602-2E
13
■ HANDLING DEVICES
Preventing Latch-up
Latch-up may occur in a CMOS IC if a voltage higher than VCC or less than VSS is applied to an input or output
pin or if a voltage exceeding the rating is applied between VCC pin and VSS pin. If latch-up occurs, the power
supply current increases rapidly, sometimes resulting in thermal breakdown of the device. Therefore, when using
a CMOS IC, do not exceed the maximum rating.
Handling 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 resistor.
Power supply pins
When provided with multiple VCC pins or VSS pins, the device is designed such that the pins having equal
potential are interconnected internally to prevent malfunctions such as latch-up. All of these pins must however
be connected to the power supply and ground externally to reduce unwanted radiation, to prevent the strobe
signal from malfunctioning due to a rise of ground level, and to follow the total output current standards. In
addition, VCC pin and VSS pin of this device should be connected from the power supply source with the lowest
possible impedance.
It is also recommended to connect a ceramic capacitor of approximately 0.1
F as a bypass capacitor between
VCC pin and VSS pin near this device.
This series has a built-in step-down regulator. Connect a bypass capacitor of 4.7
F to C_1 and C_2 pins for
the regulator.
Crystal oscillator circuit
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, and crystal oscillator, as well as bypass capacitors connected
to ground, are placed as close together as possible.
The use of printed circuit board architecture in which the X0 and X1 pins are surrounded by ground contributes
to stable operation and is strongly recommended.
Please ask the crystal maker to evaluate the oscillational characteristics of the crystal and this device.
Notes on using external clock
In principle, when using external clock, supply a clock to the X0 pin and X1 pin simultaneously. Also, an opposite
phase clock to the X0 pin must be supplied to the X1 pin. However, in this case the stop mode (oscillation stop
mode) must not be used (This is because the X1 pin stops at ”H” output in STOP mode).
Example of using external clock (normal)
X0
X1
(Note) Stop mode (oscillation stop mode) cannot be used.
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