MB89174LPF datasheet(13/50 Pages) FUJITSU

13 / 50 page

MB89170/170A/170L 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- and high-voltage pins or if higher than the voltage which shows on “1. Absolute Maximum

Ratings” in “s Electrical Characteristics” is applied between VCC to VSS.

When latchup occurs, power supply current increases rapidly and might thermally damaged elements. When

using, take great care not to exceed the absolute maximum ratings.

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

registor.

3. Treatment of N.C. Pins

Be sure to leave (internally connected) N.C. pins open.

4. Power Supply Voltage Fluctuations

Although operating is assured within the rated range of VCC power supply voltage, a rapid fluctuation of the

voltage could cause malfunctions, even if it occurs within the rated range. Stabilizing voltage supplied to the IC

is therefore important. As stabilization guidelines, it is recommended to control power so that VCC ripple

fluctuations (P-P value) will be less than 10% of the standard VCC value at the commercial frequency (50 to 60

Hz) and the transient fluctuation rate will be less than 0.1 V/ms at the time of a momentary fluctuation such as

when power is switched.

5. Precautions when Using an External Clock

When an external clock is used, oscillation stabilization time is required even for power-on reset (optional) and

wake-up from stop mode.

6. Turning on the supply voltage (only for the MB89P175A)

Power on sharply up to the option enabling voltage (2 V) within 13 clock cycles after starting of oscillation.

MB89174LPF 데이터시트(PDF) 13 Page - fujitsu semiconductor