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BD45371 Datasheet(PDF) 11 Page - Rohm

No. de pieza BD45371
Descripción Electrónicos  Counter Timer Built-in CMOS Voltage Detector IC Package SSOP5 is similar to SOT-23-5 (JEDEC)
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

BD45371 Datasheet(HTML) 11 Page - Rohm

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Datasheet
Datasheet
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BD45xxx series
BD46xxx series
TSZ02201-0R7R0G300010-1-2
© 2012 ROHM Co., Ltd. All rights reserved.
18.Dec.2012 Rev.005
www.rohm.com
TSZ22111・15・001
●Circuit Applications
1) Examples of common power supply detection reset circuits.
Application examples of BD45xxx series (Open Drain
output type) and BD46xxx series (CMOS output type)
are shown below.
CASE1: Power supply of the microcontroller (VDD2)
differs from the power supply of the reset detection
(VDD1).
Use an open drain output type (BD45xxx) with a load
resistance RL as shown Fig.18.
CASE2: Power supply of the microcontroller (VDD1) is
same as the power supply of the reset detection (VDD1).
Use a CMOS output type (BD46xxx) device or an open
drain output type (BD45xxx) device with a pull up
resistor between the output and VDD1.
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).
2) The following is an example of a circuit application in which an OR connection between two types of detection voltage
resets the microcontroller.
Fig. 20
To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain
output type (BD45xxx series) to the microcontroller’s input with pull-up resistor to the supply voltage of the microcontroller
(VDD3) as shown in Fig. 20. By pulling-up to VDD3, output “High” voltage of micro-controller power supply is possible.
Fig.18 Open Drain Output Type
Fig.19 CMOS Output Type
VDD1
VDD2
GND
BD45xxx
CL
(Noise-filtering
Capacitor)
RL
RST
Micro
controller
CL
(Noise-filtering
Capacitor)
VDD1
GND
BD46xxx
RST
Micro
controller
VDD2
VDD1
VDD3
GND
RST
Micro
controller
RL
BD45xxx
BD45xxx


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