參數(shù)資料
型號： MB90487PF
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, QFP-100
文件頁數(shù)： 21/113頁
文件大小： 1195K
代理商： MB90487PF
MB90480/485 Series
15
s
s HANDLING DEVICES
1.
Be careful never to exceed maximum rated voltages (preventing latchup)
In CMOS IC devices, a condition known as latchup may occur if voltages higher than VCC or loser than VSS are
applied to input or output pins other than medium-or high-voltage pins, or if the voltage applied between VCC and
VSS 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 (AVCC and AVRH) and analog input voltages do not exceed the digital power supply (VCC) .
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 (VCC/VSS)
When multiple VCC/VSS 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 conformity 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 VCC/VSS terminals of this device with
as low impedane as possible. It is also recommended that a bypass capacitor of approximately 0.1
F be placed
between the VCC and VSS lines as close to this device as possible.
5.
Crystal Oscillator Circuits
Noise around the X0/X1, or X0A/X1A pins may cause this device to operate abnormally. In the interest of stable
operation it is strongly recommended that printed circuit artwork places ground bypass capacitors as close as
possible to the X0/X1, X0A/X1A and crystal oscillator (or ceramic oscillator) and that oscillator lines do not cross
the lines of other circuits.
X0
X1
OPEN
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB90487PFV 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller CMOS
MB90488B 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller
MB90488BPF 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller
MB90488BPFV 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller
MB90488BPMC 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Microcontroller
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