MB3793 查看數據表（PDF） - Fujitsu

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MB3793

POWER-VOLTAGE MONITORING IC WITH WATCHDOG TIMER

Fujitsu 

s STANDARD CONNECTION

VCC

MB3793-42/30

CTW

CTP

CTW

VCC

RESET

CTP

MB3793

CK1

CK2

INH GND

RESET VCC

Microprocessor 1

CK

GND

RESET VCC

Microprocessor 2

CK

GND

Equation of time-setting capacitances (CTP and CTW) and set time

tPR (ms) ≈ A x CTP (µF)

tWD (ms) ≈ B x CTW (µF) + C x CTP (µF)

However, when —CT—P ≤ about 10,

CTW

tWD (ms) ≈ B x CTW (µF)

tWR (ms) ≈ D x CTP (µF)

Model No.

MB3793-42

MB3793-30

A

1300

750

Values of A, B, C, and D

B

C

D

1500

3

100

1600

4

55

Remark

(Example) When CTP = 0.1 µF and CTW = 0.01 µF,

• MB3793-42

tPR ≈ 130 [ms]

tWD ≈ 15 [ms]

tWR ≈ 10 [ms]

• MB3793-30

tPR ≈ 75 [ms]

tWD ≈ 16 [ms]

tWR ≈ 5.5 [ms]

5

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