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NJU7295F1-B-T Datasheet(PDF) 6 Page - New Japan Radio

Part # NJU7295F1-B-T
Description  SYSTEM RESET IC WITH DELAY CIRCUIT
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Manufacturer  NJRC [New Japan Radio]
Direct Link  http://www.jrc.co.jp/eng/index.html
Logo NJRC - New Japan Radio

NJU7295F1-B-T Datasheet(HTML) 6 Page - New Japan Radio

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NJU7295
- 6 -
Ver.2015-11-11
■ TYPICALAPPLICATION
R1, R2: Adjust the detection voltage by
resistor divider
R3:
Setting the hysteresis voltage
CIN:
To prevent malfunction due to noise
(Recommend about 10pF to 1000pF)
EXT:
The input logic signals from other
power line
● Adjusting of Detection Voltage
The Detection voltage of NJU7295 is fixed as 1.0V (typ.) internally, although it can be adjusted to a desired Detection
Voltage by connecting external resistor (R1,R2) to a VIN pin.
When adjusting to a desired Detection Voltage, it's necessary to consider VIN pin resistance RIN. (20 MΩ typ.)
● Setting of Hysteresis Voltage
The NJU7295 doesn't have the Hysteresis Voltage between the Release Voltage and Detecting Voltage in default.
It's able to set the Hysteresis Voltage optionally by connecting dividing resistor between the VIN-HYS pin.
Detection Voltage
Hysteresis Voltage =
Release Voltage = Detection Voltage - Hysteresis Voltage
● External input Pin
If inputs the logic signal from other power line(e.g. other NJU7295) into the EXT pin, it can be kept the status of the
output "High level" and ignoring the status of detection voltage VDET.
When inputs a low level signal into the EXT pin, VOUT is kept high level. It is useful for priority setting of reset signal
when monitoring multiplex power supply systems.
If do not use the External input, the EXT pin should be connected to VDDor Open.
VDD
R
R
3
1
VDET
R
R
VDET
R
RIN
RIN
R
R
VDET
3
1
2
)
2
(
1


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