MB90P663APFM View Datasheet(PDF) - Fujitsu
Part Name
Description
Manufacturer
MB90P663APFM Datasheet PDF : 84 Pages
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MB90660A Series
s HANDLING DEVICES
1. Preventing Latchup
Latchup may occur with 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 which 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.
To prevent the similar aftereffects, use also the utmost care not to allow the analog supply voltage to exceed the
digital supply voltage.
2. Treatment of Unused Input Pins
Leaving unused input pins open could cause malfunctions. They should be pins should be connected to a pull-
up or pull-down resistor.
3. External Reset Input
When resetting by inputting “L” level to the RST pin, the “L” level must be input for at least 5 machine cycles to
ensure that internal reset has occurred. Be aware of this point when using external clock input.
4. VCC, VSS Pin
Be sure that both VCC and VSS are at the same voltage.
5. Notes on Using an External Clock
Drive X0 when using an external clock.
• Using an External Clock
MB90660A
X0
X1
6. Order of Power-on to A/D Converter and Analog Inputs
Power-off (AVCC, AVR) to the digital power supply (VCC) must be performed only after the A/D converter and the
analog inputs (AN0 to AN7) has been turned on.
Turning on or off should always be performed keeping AVR below AVCC.
Use caution for the input voltage not to exceed AVCC when the pin sharing the analog input for its function is
used as an input port.
7. Programming Mode
When the MB90P663A is shipped from Fujitsu, all bits (48 K × 8 bits) are set to “1”. Program by setting selected
bits to “0” when you wish to set the data. Note that “1” cannot be programming electrically.
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