參數(shù)資料
型號： MB90F983
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 16-bit Proprietary Microcontroller
中文描述： 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP64
封裝： 10 X 10 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 12/48頁
文件大?。?/td> 321K
代理商： MB90F983
MB90980 Series
12
■
CAUTION OF USING DEVICES
1.
Maximum rated voltages (preventing latchup)
In CMOS IC devices, a condition known as latchup may occur if voltages higher than V
CC
or lower than V
SS
are
applied to input or output pins other than medium-or high-voltage pins, or if the voltage applied between V
CC
and
V
SS
exceeds the rated voltage level.
When latchup occurs, the power supply current increases rapidly causing the possibility of thermal damage to
circuit elements. Therefore it is necessary to ensure that maximum ratings are not exceeded in circuit operation.
Similarly, when turning the analog power supply on or off, it is necessary to ensure that the analog power supply
voltages (AV
CC
and AVRH) and analog input voltages do not exceed the digital power supply (V
CC
) .
2.
Treatment of unused pins
Leaving unused input pins unconnected can cause abnormal operation or latchup, leading to permanent damage.
Unused input pins should always be pulled up or down through resistance of at least 2 k
. Any unused input/
output pins may be set to output mode and left open, or set to input mode and treated the same as unused input
pins.
3.
Notes on Using External Clock
Even when using an external clock signal, an oscilltion stabilization delay is applied after a power-on reset or
when recovering from sub-clock or stop mode. When using an external clock, 25 MHz should be the upper
frequency limit.
The following figure shows a sample use of external clock signals.
4.
Treatment of Power Supply Pins (V
CC
/V
SS
)
When multiple V
CC
pins or V
SS
pins are present, device design considerations for prevention of latch-up and
unwanted electromagnetic interference, abnormal storobe signal operation due to ground level rise, and confor-
mity with total output current ratings require that all power supply pins must be externally connected to power
supply or ground.
Consideration should be given to connecting power supply sources to the V
CC
pin or V
SS
pin of this device with
as low impedane as possible. It is also recommended that a bypass capacitor of approximately 0.1
μ
F be placed
between the V
CC
and V
SS
lines as close to this device as possible.
5.
Crystal Oscillator Circuits
Noise around the high-speed oscillation pins (X0 and X1) and low-speed oscillation pins (X0A and X1A) may
cause this device to operate abnormally. Design the printed circuit board so that the crystal oscillator (or ceramic
oscillator) and bypass capacitor to the ground are located as close to the high-speed oscillation pins and low-
speed oscillation pins as possible. Also, design the printed circuit board to prevent the wiring from crossing
another writing.
It is highly recommended to provide a printed circuit board artwork surrounding the high-speed oscillation pins
and low-speed oscillation pins with a ground area for stabilizing the operation.
X0
X1
OPEN
相關PDF資料
PDF描述
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