MB3771PS datasheet(13/20 Pages) FUJITSU

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MB3771PS Datasheet(PDF) 13 Page - fujitsu semiconductor

Part #	MB3771PS

Description	Power Supply Monitor

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	FUJITSU [fujitsu semiconductor]

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13 / 20 page

MB3771

11. Low Voltage and Over Voltage Detection (VCC = 5 V)

VSH has no hysteresis. When over voltage is detected, RESET is held in the constant time as well as when

low voltage is detected.

VSL = (R1 + R2)

× VSB/R2

VSH = (R3 + R4)

× VSC/R4

12. Detection of Abnormal State of Power Supply System (VCC = 5 V)

• This Example circuit detects abnormal low/over voltage of power supply voltage and is indicated by LED

indicator. LED is reset by the CLEAR key.

• The detection levels of low/over voltages are determined by VSA, and R1 and R2 respectively.

RESET

VCC

MB3771

RESET

VCC

VSL

VSH

VCC

MB3771

R3: 620

Ω

R4:

1 k

Ω to 100 kΩ

CLEAR

LED

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