參數(shù)資料
型號(hào)： MB90V220CR
廠(chǎng)商： FUJITSU LTD
元件分類(lèi)： 微控制器/微處理器
英文描述： 16-bit Proprietary Microcontroller
中文描述： 16-BIT, 16 MHz, MICROCONTROLLER, CPGA256
封裝： CERAMIC, PGA-256
文件頁(yè)數(shù)： 16/105頁(yè)
文件大小： 1731K
代理商： MB90V220CR
MB90220 Series
16
I
HANDLING DEVICES
1. Preventing Latchup
CMOS ICs may cause latchup when a voltage higher than V
CC
or lower than V
SS
is applied to input or output
pins other than medium-and high-voltage pins, or when a voltage exceeding the rating is applied between V
CC
and V
SS
.
If latch-up occurs, the power supply current increases rapidly, sometimes resulting in thermal breakdown of the
device. Use meticulous care not to let any voltage exceed the maximum rating.
Also, take care to prevent the analog power supply (AV
CC
and AVRH) and analog input from exceeding the
digital power supply (V
CC
) when the analog system power supply is turned on and off.
2. Treatment of Unused Input Pins
Leaving unused input pins open could cause malfunctions. They should be connected to a pull-up or pull-down
resistor.
3. Treatment of Pins when A/D is not Used
Connect to be AV
CC
= AVRH = V
CC
and AV
SS
= AVRL = V
SS
even if the A/D converter is not in use.
4. Precautions when Using an External Input
To reset the internal circuit properly by the “L” level input to the RST pin, the “L” level input to the RST pin must
be maintained for at least five machine cycles. Pay attention to it if the chip uses external clock input.
5. V
CC
and V
SS
Pins
Apply equal potential to the V
CC
and V
SS
pins.
6. Supply Voltage Variation
The operation assurance range for the V
CC
supply voltage is as given in the ratings. However, sudden changes
in the supply voltage can cause misoperation, even if the voltage remains within the rated range. Therefore, it
is important to supply a stable voltage to the IC. The recommended power supply control guidelines are that
the commercial frequency (50 to 60 Hz) ripple variation (P-P value) on V
CC
should be less than 10% of the
standard V
CC
value and that the transient rate of change during sudden changes, such as during power supply
switching, should be less than 0.1 V/ms.
7. Notes on Using an External Clock
When using an external clock, drive the X0 pin as illustrated below. When an external clock is used, oscillation
stabilization time is required even for power-on reset and wake-up from stop mode.
Use of External Clock
X0
X1
MB90220
Note: When using an external clock, be sure to input external clock more than 6 machine cycles after
setting the HST pin to “L” to transfer to the hardware standby mode.
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