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BU4219 Fiches technique(PDF) 6 Page - Rohm

No de pièce BU4219
Description  Low Voltage Free Delay Time Setting CMOS Voltage Detector IC Series
Download  12 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BU4219 Fiches technique(HTML) 6 Page - Rohm

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Technical Note
6/11
BU42□□G series, BU42□□F series, BU42□□FVE series,
BU43□□G series, BU43□□F series, BU43□□FVE series
www.rohm.com
2009.11 - Rev.C
© 2009 ROHM Co., Ltd. All rights reserved.
Circuit Applications
1) Examples of a common power supply detection reset circuit
Application examples of BU42□□G/F/FVE series
(Open Drain output type) and BU43□□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 (BU42□□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 (BU43□□G/FVE) or Open Drain
Output Type (BU42□□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).
VDD1
BU43□□□
CIN
GND
CT
Microcontroller
RST
CL
(Capacitor for
noise filtering)
Fig.19 CMOS Output type
VDD1
BU42□□□
VDD2
GND
Microcontroller
RST
CL
(Capacitor for
noise filtering)
CT
RL
CIN
Fig.18 Open collector Output type


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