R5106N SERIES
Microprocessor Supervisory Circuit with Inhibit pin
NO.EA-169-200602
OUTLINE
The R5106N is a microprocessor supervisory circuit and has high accuracy and ultra low supply current voltage
detector with built-in delay circuit and watchdog timer. When the supply voltage is down across the threshold,
or the watchdog timer does not detect the system clock from the microprocessor, the reset output is generated.
The voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the
accuracy is ±1.0%. The released delay time (Power-on Reset Delay) circuit is built-in, and output delay time is
adjustable with an external capacitor, and the accuracy is ±16%(1). When the supply voltage becomes higher
than the released voltage, the reset state will be maintained during the delay time. The output type of the reset
is selectable, Nch open-drain, or CMOS.
The time out period of the watchdog timer can be also set with an external capacitor, and the accuracy is
±33%(1). There is a function to stop supervising clock by the watchdog timer (INH function). There are another
4 products by the difference of packages and the function of voltage detector and watchdog timer.
The package of R5106N is SOT-23-6.
FEATURES
• Supply Current (ISS) ............................................................... Typ. 11µA
• Operating Voltage Range (VDD)............................................. 0.9V to 6.0V
< Voltage Detector Part >
• Detector Threshold Range .................................................... 1.5V to 5.5V (0.1V steps)
• Detector Threshold Accuracy ................................................ ±1.0%
• Power-on Reset Delay Time accuracy .................................. ±16%(1) (-40°C ≤ Ta ≤ 105°C)
• Power-on reset delay time of the voltage detector ............... Typ. 370ms with an external capacitor : 0.1µF
< Watchdog Timer Part >
• Built-in a watchdog timer's time out period accuracy ............ ±33%(1) (-40°C ≤ Ta ≤ 105°C)
• Timeout period for watchdog timer ....................................... Typ. 310ms with an external capacitor : 0.1µF
• Reset timer for watchdog timer ............................................. Typ. 34ms with an external capacitor : 0.1µF
• With Inhibit pin (INH) ............................................................. Able to stop watchdog timer
• Package ................................................................................ SOT-23-6
APPLICATIONS
• Supervisory circuit for equipment with using microprocessors.
(1)
Accuracy to center value of (Min.+Max.)/2
1
R5106N
NO.EA-169-200602
SELECTION GUIDE
The detector threshold, the output type and the taping type for the ICs can be selected at the users’ request.
The selection can be made with designating the part number as shown below;
Product Name
R5106Nxx1∗-TR-FE
Package
Quantity per Reel
Pb Free
Halogen Free
SOT-23-6
3,000 pcs
Yes
Yes
xx : The detector threshold (-VDET) can be designated in the range from 1.5V(15) to 5.5V(55) in 0.1V steps.
∗ : Designation of Output Type
(A) Nch Open Drain
(C) CMOS
Series Selection
R5105N
Package
With INH pin (Inhibit)
R5106N
2
R5108G
SOT-23-6
R5109G
SSOP-8G
No
Yes
2 clock input
With MR pin (Manual
Reset)
R5107G
No
No
Yes
Yes
With SENSE pin
No
Remarks
CD pin and
CTW pin are
combined uses.
No
Yes
No
Operating
Supply Current
Voltage Range
11.5µA
1.5V to 6.0V
R5106N
NO.EA-169-200602
BLOCK DIAGRAMS
R5106Nxx1A
(Nch Open Drain Output)
R5106Nxx1C
(CMOS Output)
VDD 3
VDD 3
SW1
SW1
Vref2
CT
Vref2
Vref1
5 GND
6
SW2
CT
5 GND
SW2
WATCHDOG
TIMER
CLOCK
DETECTOR
1 SCK
RESETB 4
Vref1
6
WATCHDOG
TIMER
CLOCK
DETECTOR
RESETB 4
2 INH
2 INH
SW1: "L"=ON,
1 SCK
SW2: "H"=ON
PIN DESCRIPTIONS
• SOT-23-6
6
5
4
(mark side)
1
•
2
3
SOT-23-6
Pin No.
Symbol
Description
1
SCK
Clock Input Pin from Microprocessor
2
INH
Inhibit Pin ("L": Inhibit the watchdog timer)
3
VDD
Power supply Pin
4
RESETB
5
GND
6
CT
Output Pin for Reset signal of Watchdog timer and Voltage Detector.
(Output "L" at detecting Detector Threshold and Watchdog Timer
Reset.)
Ground Pin
External Capacitor Pin for Setting Reset and Watchdog Timeout
Periods and delay time of Voltage Detector
3
R5106N
NO.EA-169-200602
ABSOLUTE MAXIMUM RATINGS
Symbol
VDD
VCT
VRESETB
VSCK
VINH
IRESETB
Item
Supply Voltage
Output Voltage
Input Voltage
Output Current
Rating
(Ta=25°C)
Unit
-0.3 to 7.0
V
-0.3 to VDD + 0.3
V
Voltage of RESETB Pin
-0.3 to 7.0
V
Voltage of SCK Pin
-0.3 to 7.0
V
Voltage of INH Pin
-0.3 to 7.0
V
20
mA
660
mW
Voltage of CT Pin
Current of RESETB Pin
Dissipation(1)
PD
Power
(SOT-23-6, JEDEC STD. 51-7)
Tj
Junction Temperature
-40 to 125
°C
Storage Temperature Range
-55 to 125
°C
Tstg
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause permanent damage
and may degrade the life time and safety for both device and system using the device in the field.
The functional operation at or over these absolute maximum ratings are not assured.
RECOMMENDED OPERATING CONDITIONS
Symbol
V DD
Ta
Item
Rating
Unit
Operating Voltage
0.9 to 6.0
V
Operating Temperature Range
−40 to 105
°C
RECOMMENDED OPERATING CONDITIONS
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the recommended
operating conditions, even if they are used over such ratings by momentary electronic noise or surge. And the
semiconductor devices may receive serious damage when they continue to operate over the recommended
operating conditions.
(1)
4
Refer to POWER DISSIPATION for detailed information.
R5106N
NO.EA-169-200602
ELECTRICAL CHARACTERISTICS
VDD=6.0V, CT=0.1µF, In case of Nch Open Drain Output type, the output pin is pulled up with a resistance of
100kΩ (R5106Nxx1A), unless otherwise noted.
The specification in
is checked and guaranteed by design engineering at −40°C ≤ Ta ≤ 105°C.
(Ta=25°C)
R5106Nxx1A/C
Symbol
ISS
Item
Supply Current
Conditions
Min.
VDD= -VDET+0.5V,
Clock pulse input
Typ.
Max.
Unit
11
15
µA
Typ.
Max.
Unit
VD Part
Symbol
-VDET
Item
Detector Threshold
∆-V DET Detector Threshold
/∆Ta Temperature Coefficient
VHYS
Detector Threshold Hysteresis
tPLH
Output Delay Time
IRESETB
Output Current
(RESETB Output pin)
Conditions
Min.
Ta=25°C
×0.990
×1.010
−40°C ≤ Ta ≤ 105°C
×0.972
×1.015
−40°C ≤ Ta ≤ 105°C
CT=0.1µF (1)
V
ppm
/°C
±100
-VDET
×0.03
-VDET
×0.05
-VDET
×0.07
V
340
370
467
ms
Nch
VDD=1.2V,
VDS=0.1V
0.38
0.8
mA
Pch (2)
VDD=6.0V,
VDS=0.5V
0.65
0.9
mA
Conditions
Min.
Typ.
Max.
Unit
230
310
450
ms
29
34
48
ms
WDT Part
Symbol
Item
tWD
Watchdog Timeout period
CT=0.1µF
tWR
Reset Hold Time of WDT
CT=0.1µF (1)
(1)
VSCKH
SCK Input "H"
VDD×0.8
6.0
V
VSCKL
SCK Input "L"
0
VDD×0.2
V
VINHH
INH Input "H"
1.0
6.0
V
VINHL
INH Input "L"
0
0.35
V
RINH
INH pull-up Resistance
60
164
kΩ
tSCKW
SCK Input Pulse Width
VSCKL=VDD×0.2
VSCKH=VDD×0.8
110
500
ns
All test items listed under Electrical Characteristics are done under the pulse load condition (Tj ≈ Ta = 25°C) except for
Detector Threshold Temperature Coefficient.
(1)
(2)
The specification does not contain the temperature characteristics of the external capacitor.
In case of CMOS type (R5105Nxx1C)
5
R5106N
NO.EA-169-200602
Product-specific Electrical Characteristics
-V DET
Product Name
R5106N151x
R5106N161x
R5106N171x
R5106N181x
R5106N191x
R5106N201x
R5106N211x
R5106N221x
R5106N231x
R5106N241x
R5106N251x
R5106N261x
R5106N271x
R5106N281x
R5106N291x
R5106N301x
R5106N311x
R5106N321x
R5106N331x
R5106N341x
R5106N351x
R5106N361x
R5106N371x
R5106N381x
R5106N391x
R5106N401x
R5106N411x
R5106N421x
R5106N431x
R5106N441x
R5106N451x
R5106N461x
R5106N471x
R5106N481x
R5106N491x
R5106N501x
R5106N511x
R5106N521x
R5106N531x
R5106N541x
R5106N551x
6
Min.
1.485
1.584
1.683
1.782
1.881
1.980
2.079
2.178
2.277
2.376
2.475
2.574
2.673
2.772
2.871
2.970
3.069
3.168
3.267
3.366
3.465
3.564
3.663
3.762
3.861
3.960
4.059
4.158
4.257
4.356
4.455
4.554
4.653
4.752
4.851
4.950
5.049
5.148
5.247
5.346
5.445
Ta = 25°C
Typ.
1.500
1.600
1.700
1.800
1.900
2.000
2.100
2.200
2.300
2.400
2.500
2.600
2.700
2.800
2.900
3.000
3.100
3.200
3.300
3.400
3.500
3.600
3.700
3.800
3.900
4.000
4.100
4.200
4.300
4.400
4.500
4.600
4.700
4.800
4.900
5.000
5.100
5.200
5.300
5.400
5.500
Max.
1.515
1.616
1.717
1.818
1.919
2.020
2.121
2.222
2.323
2.424
2.525
2.626
2.727
2.828
2.929
3.030
3.131
3.232
3.333
3.434
3.535
3.636
3.737
3.838
3.939
4.040
4.141
4.242
4.343
4.444
4.545
4.646
4.747
4.848
4.949
5.050
5.151
5.252
5.353
5.454
5.555
-40°C ≤ Ta ≤ 105 °C
Min.
Typ.
Max.
1.4580
1.5225
1.500
1.5552
1.6240
1.600
1.6524
1.7255
1.700
1.7496
1.8270
1.800
1.8468
1.9285
1.900
1.9440
2.0300
2.000
2.0412
2.1315
2.100
2.1384
2.2330
2.200
2.2356
2.3345
2.300
2.3328
2.4360
2.400
2.4300
2.5375
2.500
2.5272
2.6390
2.600
2.6244
2.7405
2.700
2.7216
2.8420
2.800
2.8188
2.9435
2.900
2.9160
3.0450
3.000
3.0132
3.1465
3.100
3.1104
3.2480
3.200
3.2076
3.3495
3.300
3.3048
3.4510
3.400
3.4020
3.5525
3.500
3.4992
3.6540
3.600
3.5964
3.7555
3.700
3.6936
3.8570
3.800
3.7908
3.9585
3.900
3.8880
4.0600
4.000
3.9852
4.1615
4.100
4.0824
4.2630
4.200
4.1796
4.3645
4.300
4.2768
4.4660
4.400
4.3740
4.5675
4.500
4.4712
4.6690
4.600
4.5684
4.7705
4.700
4.6656
4.8720
4.800
4.7628
4.9735
4.900
4.8600
5.0750
5.000
4.9572
5.1765
5.100
5.0544
5.2780
5.200
5.1516
5.3795
5.300
5.2488
5.4810
5.400
5.3460
5.5825
5.500
V HYS
Min.
0.045
0.048
0.051
0.054
0.057
0.060
0.063
0.066
0.069
0.072
0.075
0.078
0.081
0.084
0.087
0.090
0.093
0.096
0.099
0.102
0.105
0.108
0.111
0.114
0.117
0.120
0.123
0.126
0.129
0.132
0.135
0.138
0.141
0.144
0.147
0.150
0.153
0.156
0.159
0.162
0.165
Typ.
0.075
0.080
0.085
0.090
0.095
0.100
0.105
0.110
0.115
0.120
0.125
0.130
0.135
0.140
0.145
0.150
0.155
0.160
0.165
0.170
0.175
0.180
0.185
0.190
0.195
0.200
0.205
0.210
0.215
0.220
0.225
0.230
0.235
0.240
0.245
0.250
0.255
0.260
0.265
0.270
0.275
Max.
0.105
0.112
0.119
0.126
0.133
0.140
0.147
0.154
0.161
0.168
0.175
0.182
0.189
0.196
0.203
0.210
0.217
0.224
0.231
0.238
0.245
0.252
0.259
0.266
0.273
0.280
0.287
0.294
0.301
0.308
0.315
0.322
0.329
0.336
0.343
0.350
0.357
0.364
0.371
0.378
0.385
R5106N
NO.EA-169-200602
THEORY OF OPERATION
Timing Chart
VDD
+VDET
-VDET
VDDL
VINH
tWD
tPLH
tWDI
Vref2H
VCT
Vref2L
tPHL
VSCK
tWR
tPLH
VRESETB
Undefined (1)
(2)
(3) (4)
(5)
(6)
(7)
Undefined
∗) Vref2H : CT pin voltage at the end of WDT timeout period.
∗) Vref2L : CT pin voltage at the begin of WDT timeout period.
∗) VDDL : 0.9 V (Max.)
7
R5106N
NO.EA-169-200602
Operating Description
(1) When the power supply, VDD pin voltage becomes more than the released voltage (+VDET), after the
released delay time (or the power on reset time tPLH), the output of RESETB becomes "H" level.
(2) When the SCK pulse is input, the watchdog timer (WDT) is cleared, and CT pin mode changes from the
discharge mode to the charge mode. When the CT pin voltage becomes higher than Vref2H, the mode will
change into the discharge mode, and next watchdog time count starts.
(3) Unless the SCK pulse is input, WDT will not be cleared, and during the charging period of CT pin,
RESETB="L".
(4) When the VDD pin becomes lower than the detector threshold voltage (-VDET), RESETB outputs "L".
(5) If "L" signal is input to the INH pin, the RESETB outputs "H", regardless the SCK clock state.
(6) During the "L" period of INH pin, the voltage detector monitors the supply voltage.
(7) When the signal to the INH pin is set from "L" to "H", the watchdog starts supervising the system clock, or
charge cycle to the CT pin starts, the capacitor connected to the CT pin is charged with the current of setting
Reset time of WDT.
Watchdog Timeout period/Reset hold time
The watchdog timeout period and reset hold time can be set with an external capacitor to CT pin.
The next equations describe the relation between the watchdog timeout period and the external capacitor
value, or the reset hold time and the external capacitor value.
tWD (s) = 3.1×106×C (F)
tWR (s) = tWD/9
The watchdog timer (WDT) timeout period is determined with the discharge time of the external capacitor.
During the watchdog timeout period, if the clock pulse from the system is detected, WDT is cleared and the
capacitor is charged. When the charge of the capacitor completes, another watchdog timeout period starts
again. During the watchdog timeout period, if the clock pulse from the system is not detected, during the next
reset hold time RESETB pin outputs "L".
During the reset time, (while charging the external capacitor) and after starting the watchdog timeout period,
(just after from the discharge of the external capacitor) even if the clock pulse is input during the time period
"tWDI", the clock pulse is ignored.
tWDI (s) = tWD/10
Released Delay Time (Power-on Reset delay time)
The released delay time can be set with an external capacitor connected to the CT pin. The next equation
describes the relation between the capacitance value and the released delay time (tPLH).
tPLH (s) =3.7×106× C (F)
The capacitor connected to CT pin determines tWD, tWR, and tPLH.
When the VDD voltage becomes equal or less than (-VDET), discharge of the capacitor connected to the CT pin
starts. Therefore, if the discharge is not enough and VDD voltage returns to (+VDET) or more, thereafter the delay
time will be shorter than tPLH which is expected.
8
R5106N
NO.EA-169-200602
Power on Reset Operation against the input glitch (tPLH1 < tPLH)
VDD
+VDET
-VDET
0V
VCT
Complete
Discharge
+VTCT
-VTCT
0V
Incomplete
Discharge
VRESETB
0V
tPHL
tPLH1
tPHL
tPLH
Minimum Operating Voltage
We specified the minimum operating voltage as the minimum input voltage in which the condition of RESETB
pin being 0.1V or lower than 0.1V. (Herein, pull-up resistance is set as 100kΩ in the case of the Nch opendrain output type.)
Inhibit (INH) Function
If INH pin is set at "L", the watchdog timer stops monitoring the clock, and the RESETB output will be dominant
by the voltage detector's operation. Therefore, if the supply voltage is set at more than the detector threshold
level, RESETB outputs "H" regardless the clock pulse. INH pin is pulled up with a resistor (TYP.110kΩ)
internally.
RESETB Output
RESETB pin's output type is selectable either the Nch open-drain output or CMOS output. If the Nch opendrain type output is selected, the RESETB pin is pulled up with an external resistor to an appropriate voltage
source.
Clock Pulse Input
Built-in watchdog timer is cleared with the SCK clock pulse within the watchdog timeout period.
9
R5106N
NO.EA-169-200602
APPLICATION INFORMATION
Typical Applications
Power Supply
Microprocessor
VDD
R
3 VDD
RESETB 4
R5106Nxx1A
SCK
SW
2 INH
RESET
1
I/O
CT 6
GND
CT
5
R5106Nxx1A
Power Supply
Microprocessor
VDD
3 VDD
RESETB 4
R5106Nxx1C
RESET
1
I/O
SCK
SW
2 INH
GND
CT 6
5
R5106Nxx1C
10
CT
R5106N
NO.EA-169-200602
TECHNICAL NOTES
When connecting resistors to the device’s input pin
When connecting a resistor (R1) to an input of this device, the input voltage decreases by [Device’s
Consumption Current] x [Resistance Value] only. And, the cross conduction current(1), which occurs when
changing from the detecting state to the release state, is decreased the input voltage by [Cross Conduction
Current] x [Resistance Value] only. And then, this device will enter the re-detecting state if the input voltage
reduction is larger than the difference between the detector voltage and the released voltage.
When the input resistance value is large and the VDD is gone up at mildly in the vicinity of the released voltage,
repeating the above operation may result in the occurrence of output.
As shown in Figure A/B, set R1 to become 100kΩ or less as a guide, and connect C IN (2) of 0.1μF and more to
between the input pin and GND. Besides, make evaluations including temperature properties under the actual
usage condition, with using the evaluation board like this way. As result, make sure that the cross conduction
current has no problem.
R1
R1
VDD
CIN
(2）
Voltage
VDD
R2
CIN(2）
OUT pin
Detector
GND
Figure A
Voltage
OUT pin
Detector
GND
Figure B
(1) In
(2)
the CMOS output type, a charging current for OUT pin is included.
Note the bias dependence of capacitors.
11
R5106N
NO.EA-169-200602
TYPICAL CHARACTERISTICS
Note: Typical Characteristics are intended to be used as reference data; they are not guaranteed.
1) Supply Current vs. Input Voltage
R510xx151x
R510xx301x
2) Detector Threshold vs. Temperature
R510xx151x
R510xx421x
12
R510xx271x
R5106N
NO.EA-169-200602
3) Detector Threshold Hysteresis vs. Temperature
R510xx151x
R510xx271x
R510xx421x
4) Nch Driver Output Current vs. VDS
R510xx
13
R5106N
NO.EA-169-200602
5) Nch Driver Output Current vs. Input Voltage
R510xx
R510xx
6) Pch Driver Output Current vs. Input Voltage
R510xx
R510xx
14
R510xx
R5106N
NO.EA-169-200602
7) Released Delay Time vs. Input Voltage
R510xx
8) Released Delay Time vs. Temperature
R510xx
9) Detector Output Delay Time vs. Temperature 10) WDT Reset Timer vs. Temperature
R510xx
11) WDT Timeout Period vs. Temperature
R510xx
R510xx
12) WDT Reset Timer vs. Input Voltage
R510xx
15
R5106N
NO.EA-169-200602
13) WDT Timeout Period vs. Input Voltage
Capacitance
R510xx
16
14) Output Delay Time vs. External
R510xx
POWER DISSIPATION
SOT-23-6
Ver. A
The power dissipation of the package is dependent on PCB material, layout, and environmental conditions.
The following measurement conditions are based on JEDEC STD. 51-7.
Measurement Conditions
Item
Measurement Conditions
Environment
Mounting on Board (Wind Velocity = 0 m/s)
Board Material
Glass Cloth Epoxy Plastic (Four-Layer Board)
Board Dimensions
76.2 mm × 114.3 mm × 0.8 mm
Copper Ratio
Outer Layer (First Layer): Less than 95% of 50 mm Square
Inner Layers (Second and Third Layers): Approx. 100% of 50 mm Square
Outer Layer (Fourth Layer): Approx. 100% of 50 mm Square
Through-holes
φ 0.3 mm × 7 pcs
Measurement Result
(Ta = 25°C, Tjmax = 125°C)
Item
Measurement Result
Power Dissipation
660 mW
Thermal Resistance (θja)
θja = 150°C/W
Thermal Characterization Parameter (ψjt)
ψjt = 51°C/W
θja: Junction-to-Ambient Thermal Resistance
ψjt: Junction-to-Top Thermal Characterization Parameter
1000
900
Power Dissipation (mW)
800
700
660
600
500
400
300
200
100
0
0
25
50
75
100 105 125
150
Ambient Temperature (°C)
Power Dissipation vs. Ambient Temperature
Measurement Board Pattern
i
PACKAGE DIMENSIONS
SOT-23-6
Ver. A
2.9±0.2
+0.2
1.1-0.1
1.9±0.2
4
1
2
0 to 0.1
0.2MIN.
5
+0.2
1.6-0.1
6
0.8±0.1
(0.95)
2.8±0.3
(0.95)
3
+0.1
0.4-0.2
+0.1
0.15-0.05
Unit : mm
SOT-23-6 Package Dimensions (Unit: mm)
i
1. The products and the product specifications described in this document are subject to change or discontinuation of
production without notice for reasons such as improvement. Therefore, before deciding to use the products, please
refer to Ricoh sales representatives for the latest information thereon.
2. The materials in this document may not be copied or otherwise reproduced in whole or in part without prior written
consent of Ricoh.
3. Please be sure to take any necessary formalities under relevant laws or regulations before exporting or otherwise
taking out of your country the products or the technical information described herein.
4. The technical information described in this document shows typical characteristics of and example application circuits
for the products. The release of such information is not to be construed as a warranty of or a grant of license under
Ricoh's or any third party's intellectual property rights or any other rights.
5. The products listed in this document are intended and designed for use as general electronic components in standard
applications (office equipment, telecommunication equipment, measuring instruments, consumer electronic products,
amusement equipment etc.). Those customers intending to use a product in an application requiring extreme quality
and reliability, for example, in a highly specific application where the failure or misoperation of the product could result
in human injury or death (aircraft, spacevehicle, nuclear reactor control system, traffic control system, automotive and
transportation equipment, combustion equipment, safety devices, life support system etc.) should first contact us.
6. We are making our continuous effort to improve the quality and reliability of our products, but semiconductor products
are likely to fail with certain probability. In order to prevent any injury to persons or damages to property resulting from
such failure, customers should be careful enough to incorporate safety measures in their design, such as redundancy
feature, fire containment feature and fail-safe feature. We do not assume any liability or responsibility for any loss or
damage arising from misuse or inappropriate use of the products.
7. Anti-radiation design is not implemented in the products described in this document.
8. The X-ray exposure can influence functions and characteristics of the products. Confirm the product functions and
characteristics in the evaluation stage.
9. WLCSP products should be used in light shielded environments. The light exposure can influence functions and
characteristics of the products under operation or storage.
10. There can be variation in the marking when different AOI (Automated Optical Inspection) equipment is used. In the
case of recognizing the marking characteristic with AOI, please contact Ricoh sales or our distributor before attempting
to use AOI.
11. Please contact Ricoh sales representatives should you have any questions or comments concerning the products or
the technical information.
Halogen Free
Ricoh is committed to reducing the environmental loading materials in electrical devices
with a view to contributing to the protection of human health and the environment.
Ricoh has been providing RoHS compliant products since April 1, 2006 and Halogen-free products since
April 1, 2012.
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https://www.n-redc.co.jp/en/
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https://www.n-redc.co.jp/en/buy/
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