F497 查看數據表（PDF） - Fujitsu

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F497

16-bit Proprietary Microcontroller

Fujitsu 

MB90495 Series

14.4 Power On Reset

Parameter

Symbol

Pin

Power on rise time

tR

VCC

Power off time

tOFF

VCC

Test Condition

—

(TA = –40 to +85°C, VCC = 5.0 V 10%, VSS = AVSS = 0.0 V)

Rated Value

Units

Min. Max.

Remarks

0.05 30

ms

50

—

ms Due to repetitive operation

tR

3.5 V

VCC

0.2 V

0.2 V

tOFF

0.2 V

If you change the power supply voltage too rapidly, a power on reset may occur. We recommend that

you startup smoothly by restraining voltages when changing the power supply voltage during opera-

tion, as shown in the figure below. Perform while not using the PLL clock. However, if voltage drops

are within 1 mV/sec, you can operate while using the PLL clock.

VCC

3V

We recommend a rise of

50 mV/ms maximum.

Holds RAM data

VSS

Figure 14.5 Power On Reset Timing

MB90495 Series Data Sheet (Advance Information) 27 / 40

FME EMDC June 19, 2000

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