MB89P147 datasheet(23/38 Pages) FUJITSU

23 / 38 page

MB89143A/144A

4. AC Characteristics

(1) Reset Timing

(AVR = VCC = 5.0 V

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

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

(2) Power-on Reset

(AVSS = VSS = 0.0 V, TA = –40

°C to +85°C)

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

If power supply voltage needs to be varied in the course of operation, a smooth voltage rise is

recommended.

Parameter

Symbol

Condition

Value

Unit

Remarks

Min.

Typ.

Max.

RST “L” pulse width

tZLZH

—16 tXCYL

——

RST noise limit width

tZLNC

—

204060

Parameter

Symbol

Condition

Value

Unit

Remarks

Min.

Max.

Power supply rising

time

——

Power-on reset function

only

Power supply cut-off

time

tOFF

—1

—

Due to repeated

operations

0.2 VCC

RST

tZLZH

tZLNC

0.2 V

2.0 V

0.2 V

VCC

tOFF

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