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BU4931 датащи(PDF) 6 Page - Rohm

номер детали BU4931
подробное описание детали  Low Voltage Standard CMOS Voltage Detector ICs
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
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BU4931 датащи(HTML) 6 Page - Rohm

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Technical Note
6/8
BU48□□G Series, BU48□□F Series, BU48□□FVE Series,
BU49□□G Series, BU49□□F Series, BU49□□FVE Series
www.rohm.com
2011.03 - Rev.D
© 2011 ROHM Co., Ltd. All rights reserved.
Circuit Applications
1) Examples of a common power supply detection reset circuit
Application examples of BU48□□G/F/FVE series
(Open Drain output type) and BU49□□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 (BU48□□G/FVE)
attached a load resistance (RL) between the output and
VDD2. (As shown Fig.15)
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 (BU48□□G/FVE) attached a load
resistance (RL) between the output and VDD1.
(As shown Fig.16)
When a capacitance CL for noise filtering or setting the
output delay time 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).
2) Examples of the power supply with resistor dividers
In applications where the power supply input terminal (VDD) of an IC with resistor dividers, it is possible that a
through-current will momentarily flow into the circuit when the output logic switches, resulting in malfunctions (such as
output oscillatory state).(Through-current is a current that momentarily flows from the power supply (VDD) to ground
(GND) when the output level switches from “High” to “Low” or vice versa.) Consider the use of BD48□□ when the power
supply input it with resistor dividers.
Fig.17
VOUT
R2
VDD
BU48□□
BU49□□
GND
R1
I1
V1
CIN
CL
VDD1
BU48□□□
VDD2
GND
Microcontroller
RST
CL
(Capac itor for
noise filtering)
RL
CIN
CL
(Capacitor for
nois e filtering)
VDD1
BU49□□□
Microcontroller
RST
CIN
GND
Fig.15 Open collector Output type
Fig.16 CMOS Output type


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