MB89490 데이터 시트보기 (PDF) - Fujitsu

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MB89490

8-bit Proprietary Microcontroller

Fujitsu 

MB89490 Series

4. AC Characteristics

(1) Reset Timing

Parameter

RST “L” pulse width

Symbol

tZLZH

(AVCC = VCC = 3.0 V, AVSS = VSS = 0.0 V, TA = –40°C to +85°C)

Condition

Value

Min.

Max.

Unit

Remarks

—

48 tHCYL

—

ns

Note: tHCYL is the oscillation cycle (1/FCH) to input to the X0 pin.

The MCU operation is not guaranteed when the "L" pulse width is shorter than tZLZH.

RST

tZLZH

0.2 VCC

0.2 VCC

(2) Power-on Reset

Parameter

Power supply rising time

Power supply cut-off time

Symbol Condition

tR

—

tOFF

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

Value

Unit

Min. Max.

Remarks

—

50 ms

1

—

ms Due to repeated operations

Note: Make sure that power supply rises within the selected oscillation stabilization time.

Rapid changes in power supply voltage may cause a power-on reset. If power supply voltage needs to

be varied in the course of operation, a smooth voltage rise is recommended.

tR

tOFF

1.5 V

0.2 V

0.2 V

0.2 V

VCC

30

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