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參數(shù)資料
| 型號： | MB90F922NCPMC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP120 |
| 封裝： | 16 X 16 MM, 1.70 MM HEIGHT, 0.50 M PITCH, PLASTIC, LQFP-120 |
| 文件頁數(shù)： | 9/72頁 |
| 文件大?。?/td> | 2151K |
| 代理商： | MB90F922NCPMC |
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MB90920 Series
DS07-13750-3E
17
■ HANDLING DEVICES
Strictly observe maximum rated voltages (preventing latch-up)
In CMOS IC devices, a condition known as latch-up may occur if voltages higher than VCC or lower than VSS are
applied to input or output pins other than medium or high withstand voltage pins, or if the voltage applied between
VCC and VSS pins exceeds the rated voltage level. If a latch-up occurs, the power supply current may increase
dramatically and may destroy semiconductor elements. When using semiconductor devices, always take suffi-
cient care to avoid exceeding maximum ratings.
When the analog system power supply is switched on or off, be careful not to apply the analog power supply
(AVCC, AVRH), the analog input voltages and the power supply voltage for the high current output buffer pins
(DVCC) in excess of the digital power supply voltage (VCC).
Once the digital power supply voltage (VCC) has been disconnected, the analog power supply (AVCC, AVRH) and
the power supply voltage for the high current output buffer pins (DVCC) may be turned on in any sequence.
Supply voltage stabilization
Rapid fluctuations in the power supply voltage can cause malfunctions even if the Vcc power supply voltage
remains within the warranted operating range. It is recommended that the power supply be stabilized such that
ripple fluctuations (P-P value) at commercial frequencies (50 Hz/60 Hz) be limited to within 10
% of the standard
VCC value, and that transient fluctuations due to power supply switching, etc. be limited to a rate of 0.1 V/ms or less.
Precautions when turning the power on
In order to prevent the built-in step-down circuits from malfunctioning, the time taken for the voltage to rise
(0.2 V to 2.7 V) during power-on should be less than 50
s.
Handling unused pins
If unused input pins are left open, they may cause malfunctions or latch-up which may lead to permanent damage
to the semiconductor. Unused input pins should therefore be pulled up or pulled down through a resistor of at
least 2 k
.
Unused input/output pins may be set to the output state and left open, or set to the input state and connected
to a pull-up or pull-down resistance of 2 k
or more.
Handling A/D converter power supply pins
Even if the A/D converter is not used, the power supply pins should be connected such as AVCC
= VCC, and
AVSS
= AVRH = VSS.
Notes on using an external clock
Even when an external clock is used, an oscillation stabilization wait time is required following power-on reset
or release from sub clock mode or stop mode. Furthermore, only the X0A pin should be driven when an external
clock is used, with the X1A pin open as shown in the following diagram. Do not use high-speed oscillation pins
(X0 and X1) for external clock input.
X0A
X1A
OPEN
MB90920 Series
Sample external clock connection
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