BU42XXG_09 Datasheet, PDF(6/12 Page) Rohm – Low Voltage Free Delay Time Setting CMOS Voltage Detector IC Series

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BU42XXG_09 Datasheet, PDF (6/12 Pages) Rohm – Low Voltage Free Delay Time Setting CMOS Voltage Detector IC Series

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BU42â¡â¡G series, BU42â¡â¡F series, BU42â¡â¡FVE series,

BU43â¡â¡G series, BU43â¡â¡F series, BU43â¡â¡FVE series

Technical Note

âCircuit Applications

1) Examples of a common power supply detection reset circuit

VDD1

CIN

BU42â¡â¡â¡

VDD2

Microcontroller

RST

(Capacitor for

noise filtering)

GND

Fig.18 Open collector Output type

VDD1

CIN

GND

BU43â¡â¡â¡

Microcontroller

RST

(Capacitor for

noise filtering)

Fig.19 CMOS Output type

Application examples of BU42â¡â¡G/F/FVE series

(Open Drain output type) and BU43â¡â¡G/F/FVE series

(CMOS output type) are shown below.

CASE1:The power supply of the microcontroller (Vdd2)

differs from the power supply of the reset detection

(Vdd1).

Use the Open Drain Output Type (BU42â¡â¡G/FVE)

attached a load resistance (RL) between the output and

Vdd2. (As shown Fig.18)

CASE2:The power supply of the microcontroller (Vdd1) is

same as the power supply of the reset detection (Vdd1).

Use CMOS output type (BU43â¡â¡G/FVE) or Open Drain

Output Type (BU42â¡â¡G/FVE) attached a load

resistance (RL) between the output and Vdd1.

(As shown Fig.19)

When a capacitance CL for noise filtering is connected to

the Vout pin (the reset signal input terminal of the

microcontroller), please take into account the waveform

of the rise and fall of the output voltage (Vout).

www.rohm.com

6/11

2009.11 - Rev.C

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