參數(shù)資料
型號： MB90234PFV-XXX
廠商： FUJITSU LTD
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, LQFP-100
文件頁數(shù)： 7/83頁
文件大?。?/td> 1566K
代理商： MB90234PFV-XXX
15
MB90230 Series
s HANDLING DEVICES
1. Preventing Latchup
Latchup may occur on CMOS ICs if voltage higher than VCC or lower than VSS is applied to input and output pins
other than medium- to high-voltage pins or if higher than the voltage wihich shows on “1. Absolute Maximum
Ratings” in section “s Electrical Characteristics” is applied between VCC and VSS.
When latchup occurs, power supply current increases rapidly and might thermally damage elements. When
using, take great care not to exceed the absolute maximum ratings.
Also, take care to prevent the analog power supply (AVCC and AVR) and analog input from exceeding the digital
power supply (VCC) when the analog system power supply is turned on and off.
2. Treatment of Unused Pins
Leaving unused input pins open could cause malfunctions. They should be connected to a pull-up or pull-down
resistor.
3. External Reset Input
To reset the internal circuit by the Low-level input to the RST pin, the Low-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.
4. VCC and VSS Pins
Apply equal potential to the VCC and VSS pins.
5. Notes on Using an External Clock
When using an external clock, drive the X0 pin as illustrated below:
6. Power-on Sequence for A/D Converter Power Supplies and Analog Inputs
Be sure to turn on the digital power supply (VCC) before applying voltage to the A/D converter power supplies
(AVCC, AVRH, and AVRL) and analog inputs (AN0 to AN15).
When turning power supplies off, turn off the A/D converter power supplies (AVCC, AVRH, and AVRL) and analog
inputs (AN0 to AN15) first, then the digital power supply (AVCC).
When turning AVRH on or off, be careful not to let it exceed AVCC.
7. Pin set when turning on power supplies
When turning on power supplies, set the hardware standby input pin (HST) to “H”.
Use of External Clock
X0
X1
MB90234
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