參數(shù)資料
型號： MB90474PF
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, QFP-100
文件頁數(shù)： 27/118頁
文件大?。?/td> 1199K
代理商： MB90474PF
MB90470 Series
16
s HANDLING DEVICES
(1) Strictly observe maximum rated voltages (prevent latchup)
When CMOS integrated circuit devices are subjected to applied voltages higher than VCC at input and output
pins other than medium- and high-withstand voltage pins, or to voltages lower than VSS, or when voltages in
excess of rated levels are applied between VCC and VSS, a phenomenon known as latchup can occur. In a latchup
condition, supply current can increase dramatically and may destroy semiconductor elements. In using
semiconductor devices, always take sufficient care to avoid exceeding maximum ratings.
Also care must be taken when power to analog systems is switched on or off, to ensure that the analog power
supply (AVCC, AVRH) and analog input do not exceed the digital power supply (VCC) .
(2) Treatment of unused pins
If unused input pins are left open, abnormal operation or latchup may cause permanent damage to the
semiconductor. Any such pins should be pulled up or pulled down through resistance of at least 2 k
.
Also any unused input/output pins should be left open in output status, or if set to input status should be treated
in the same way as input pins.
(3) Precautions for use of external clock signals
Even when an external clock is used, a stabilization period is required following a power-on reset or release
from sub clock mode or stop mode. Also, when an external clock is used 20 MHz should be used as a guideline
for an upper frequency limit.
The following figure shows a sample use of external clock signals.
(4) Power supply pins
When using multiple VCC/VSS sources, always make sure to design devices with external connections of all power
supply pins to supply or ground elements, in order to prevent latchup, reduce unwanted radiation, and prevent
abnormal strobe signal operation due to rise in ground level, as well as to maintain total rated output current. In
addition, care must be given to connecting the VCC and VSS pins of this device to a current source with as little
impedance as possible. It is recommended that a bypass capacitor of 1.0
F be connected between VCC and
VSS as close to the pins as possible.
(5) Crystal oscillator circuits
Abnormal operation of this device can result from noise in the proximity of the X0/X1 and X0A/X1A pins. For
stable operation, it is strongly recommended that the printed circuit artwork provide capacitors placed as close
as possible between the X0/X1, X0A/X1A and crystal oscillator (or ceramic oscillator) as well as ground, and be
wired so as to avoid crossing other wiring wherever possible.
X0
X1
OPEN
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PDF描述
MB90478PFV 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP100
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB90474PFV 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
MB90477 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
MB90477PF 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
MB90477PFV 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
MB90478 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
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