R3117xxx1/2 SERIES

LOW VOLTAGE DETECTOR with SENSE pin

NO.EA-186-200807

Notice

If the SENSE pin voltage of R3117xxx1A/C and R3117Qxx2A/C make the gradual curve by raising 0.5V/ms
or less, it may cause noise when the output voltage is switched from low to high. Please use R3117xxx3A/C
and R3117Qxx4A/C Series for new designs instead of these products to avoid the above problem.

OUTLINE
The R3117x series are CMOS-based voltage detector ICs with high detector threshold accuracy and ultra-low
supply current, which can be operated at an extremely low voltage and is used for system reset as an example.
Each of these ICs consists of a voltage reference unit, a comparator, resistors for detector threshold setting,
an output driver and a hysteresis circuit. The detector threshold is fixed with high accuracy internally and does
not require any adjustment.
The tolerance of the detector threshold is ±15mV (-VDET < = 1.5V) or ±1.0% (1.5V< -VDET). Since the sense pin
is separated from the VDD pin of the IC, therefore, even if the sense pin voltage becomes to 0V, the output voltage
keeps its "L" level.
Two output types, Nch open drain type and CMOS type are available.
Three types of packages, SOT-23-5, SC-88A, and DFN(PL)1010-4 are available.

FEATURES∗
• Supply Current ...................................................................... Typ. 0.29µA (VDD=6.0V)
Consumption current through SENSE pin is not included.

• Operating Voltage Range...................................................... 1.0V to 6.0V (-40°C < = Topt <= 105°C)
• Detector Threshold Range .................................................... 0.7V to 5.0V (0.1V steps)
(For other voltages, please refer to MARK INFORMATIONS.)
• Accuracy Detector Threshold ................................................ ±1.0% (-VDET > = 1.6V), ±15mV (-VDET<1.6V)
• Temperature-Drift Coefficient of Detector Threshold ............ Typ. ±30ppm/°C
• Output Types ......................................................................... Nch Open Drain and CMOS
• Packages .............................................................................. DFN(PL)1010-4, SC-88A, SOT-23-5
∗ Topt=25°C, unless otherwise noted.

APPLICATIONS
• CPU and Logic Circuit Reset
• Battery Checker
• Window Comparator
• Wave Shaping Circuit
• Battery Back-up Circuit
• Power Failure Detector

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BLOCK DIAGRAMS

Nch Open Drain Output (R3117xxxxA) CMOS Output (R3117xxxxC)

SENSE SENSE

VDD DOUT VDD

DOUT

Vref Vref

GND GND

SELECTION GUIDE
The package type, the detector threshold, the output type and the taping type for the ICs can be selected at
the users’ request.

Product Name Package Quantity per Reel Pb Free Halogen Free

R3117Kxx1∗-TR DFN(PL)1010-4 10,000 pcs Yes Yes
R3117Qxx2∗-TR-FE SC-88A 3,000 pcs Yes Yes
R3117Nxx1∗-TR-FE SOT-23-5 3,000 pcs Yes Yes
xx : The detector threshold can be designated in the range from 0.7V(07) to 5.0V(50) in 0.1V steps.
(For other voltages, please refer to MARK INFORMATIONS.)

∗ : Designation of Output Type

(A) Nch Open Drain
(C) CMOS

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PIN CONFIGURATIONS
• DFN（PL）1010-4*1 • SC-88A • SOT-23-5
Top View Bottom View 5 4 5 4
4 3 3 4

(mark side) (mark side)

2 1 1 2 3
1 2 1 2 3

PIN DESCRIPTIONS
• DFN(PL)1010-4*1
Pin No. Symbol Description
1 DOUT Output Pin ("L" at detection)
2 SENSE Voltage Detector Voltage Sense Pin
3 GND Ground Pin
4 VDD Input Pin
∗1) Tab is GND level. (They are connected to the reverse side of this IC.)
The tab is better to be connected to the GND, but leaving it open is also acceptable.

• SC-88A
Pin No. Symbol Description
1 VDD Input Pin
2 NC No Connection*2
3 GND Ground Pin
4 SENSE Voltage Detector Voltage Sense Pin
5 DOUT Output Pin ("L" at detection)

∗2) In terms of NC pin of SC-88A, connect it to the GND or use it as open.

• SOT-23-5
Pin No. Symbol Description
1 DOUT Output Pin ("L" at detection)
2 VDD Input Pin
3 GND Ground Pin
4 NC No Connection
5 SENSE Voltage Detector Voltage Sense Pin

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ABSOLUTE MAXIMUM RATINGS

Symbol Item Rating Unit
VDD Supply Voltage 7.0 V
VSENSE SENSE Pin Voltage 7.0 V
Output Voltage (Nch Open Drain Output) VSS−0.3 to 7.0
VOUT V
Output Voltage (CMOS Output) VSS−0.3 to VDD+0.3
IOUT Output Current 20 mA
Power Dissipation (DFN(PL)1010-4)* 400
PD Power Dissipation (SC-88A)* 380 mW
Power Dissipation (SOT-23-5)* 420
Topt Operating Temperature Range −40 to 105 °C
Tstg Storage Temperature Range −55 to 125 °C
* ) For Power Dissipation, please refer to PACKAGE INFORMATION.

ABSOLUTE MAXIMUM RATINGS

Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the
permanent damages 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 is not assured.

ELECTRICAL CHARACTERISTICS
• R3117xxxxA/C values indicate −40°C <
= Topt <
= 105°C, unless otherwise noted. Topt=25°C
Symbol Item Conditions Min. Typ. Max. Unit
1.0V <
= VDD <
= 5.25V -VDET-15 -VDET+15
0.7V <
= -VDET<1.6V mV
5.25V < VDD <
= 6.0V -VDET-11 -VDET+24
Detector Threshold -VDET -VDET
-VDET
(Topt=25°C) 1.0V <
= VDD <
= 5.25V ×0.99 ×1.01
1.6V <
= -VDET <
= 5.0V V
-VDET -VDET
5.25V < VDD <
= 6.0V ×0.9925 ×1.016
1.0V <
= VDD <
= 5.25V -VDET-30 -VDET+30
0.7V <
= -VDET<1.6V mV
5.25V < VDD <
= 6.0V -VDET-26 -VDET+39
Detector Threshold -VDET -VDET
-VDET
(-40°C <
= Topt <
= 105°C) 1.0V <
= VDD <
= 5.25V ×0.98 ×1.02
1.6V <
= -VDET <
= 5.0V -VDET V
-VDET
5.25V < VDD <
= 6.0V ×0.9825 ×1.026
Detector Threshold -VDET -VDET
VHYS Hysteresis VDD=1.0V to 6.0V ×0.04 ×0.07 V
VSENSE=-VDET-0.1V 0.31 1.47
ISS Supply Current*1 µA
VSENSE=-VDET×1.1 0.29 1.25

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Symbol Item Conditions Min. Typ. Max. Unit

-VDET < 1.5V 6 25
RSENSE Sense Resistor 1.5V <
= -VDET < 4.7V 5 40 MΩ
4.7V <
= -VDET 10 40
VDD Operating Voltage -40°C <
= Topt <
= 105°C 1.0 6.0 V
Minimum Operating Topt=25°C 0.50
VDDL V
Voltage*2 -40°C <
= Topt <
= 105°C 0.55
VDD=0.6V, VDS=0.05V 7 µA
VDD=0.6V
-VDET < 1.1V VDS=0.5V 0.020
VDD=1.0V
Nch 1.1V <
= -VDET < 1.6V VDS=0.5V 0.400
mA
VDD=1.5V
IOUT
Output Current 1.6V <
= -VDET < 3.1V VDS=0.5V 1.000
(Driver Output Pin)
VDD=3.0V
3.1V <
= -VDET VDS=0.5V 2.400
VDD=4.5V
-VDET < 4.0V VDS=2.1V 0.650
Pch*3 mA
VDD=6.0V
4.0V <
= -VDET VDS=2.1V 0.900
Nch Driver Leakage
ILEAK VDD=6.0V, VDS=7.0V 140 nA
Current*4
Detector Threshold
∆-VDET/ ppm
Temperature -40°C <
= Topt <
= 105°C ±30
∆Topt /°C
Coefficient
Detector Output Delay -VDET < 1.5V 80
tPHL VDD=5V µs
Time*5 1.5V <
= -VDET 40
Release Output Delay -VDET < 4.5V 40
tPLH VDD=5V <
µs
Time*5 4.5V = -VDET 80
All of unit are tested and specified under load conditions such that Topt=25°C except for Detector Threshold
Temperature Coefficient, Detector Output Delay Time and Release Output Delay Time.
*1: Consumption current through SENSE pin is not included.
*2: In case that the VDD pin and SENSE pin are connected and the value shows the minimum supply voltage (VDD) when the
output voltage at detector threshold can be maintained as 0.1V or less. (In case of Nch open drain type, pull-up resistor
is 470kΩ and pull-up voltage is set at 5V for testing.) If VDD is high enough, down to 0V is acceptable for SENSE pin.
*3: In case of CMOS type
*4: In case of Nch Open Drain type
*5: In the case of CMOS output type: Time interval from forcing pulsive 6.0V to -VDET-2.0V or 0V, or from forcing 0V to
-VDET+2.0V or 6.0V to SENSE pin, to when the output voltage will reach VDD/2.
In the case of Nch Open drain output type: Output pin is pulled up to 5V with 470kΩ and time interval from forcing 6.0V
to -VDET-2.0V or 0V, or forcing pulsive 0V to -VDET+2.0V or 6.0V to when the output voltage reaches up to 2.5V.

RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)

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 when they are used over such conditions by momentary
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue
to operate over the recommended operating conditions.

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ELECTRICAL CHARACTERISTICS BY DETECTOR THRESHOLD

• R3117x07xA/C to R3117x50xA/C
Bold values are checked and guaranteed by design engineering at −40°C <
= Topt <
= 105°C, unless otherwise noted.
Topt=25°C
Detector Threshold Detector Threshold Detector Threshold Detector Threshold Detector Threshold
Part 1.0V <
= VDD <
= 5.25V 1.0V <
= VDD <
= 5.25V 5.25V < VDD <
= 6.0V 5.25V < VDD <
= 6.0V Hysteresis
Number -VDET [V] -VDET [V] -VDET [V] -VDET [V] VHYS [V]
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
R3117x07xA/C 0.6850 0.7150 0.6700 0.7300 0.6890 0.7240 0.6740 0.7390 0.028 0.049
R3117x08xA/C 0.7850 0.8150 0.7700 0.8300 0.7890 0.8240 0.7740 0.8390 0.032 0.056
R3117x09xA/C 0.8850 0.9150 0.8700 0.9300 0.8890 0.9240 0.8740 0.9390 0.036 0.063
R3117x10xA/C 0.9850 1.0150 0.9700 1.0300 0.9890 1.0240 0.9740 1.0390 0.040 0.070
R3117x11xA/C 1.0850 1.1150 1.0700 1.1300 1.0890 1.1240 1.0740 1.1390 0.044 0.077
R3117x12xA/C 1.1850 1.2150 1.1700 1.2300 1.1890 1.2240 1.1740 1.2390 0.048 0.084
R3117x13xA/C 1.2850 1.3150 1.2700 1.3300 1.2890 1.3240 1.2740 1.3390 0.052 0.091
R3117x14xA/C 1.3850 1.4150 1.3700 1.4300 1.3890 1.4240 1.3740 1.4390 0.056 0.098
R3117x15xA/C 1.4850 1.5150 1.4700 1.5300 1.4890 1.5240 1.4740 1.5390 0.060 0.105
R3117x16xA/C 1.5840 1.6160 1.5680 1.6320 1.5880 1.6256 1.5720 1.6416 0.064 0.112
R3117x17xA/C 1.6830 1.7170 1.6660 1.7340 1.6872 1.7272 1.6702 1.7442 0.068 0.119
R3117x18xA/C 1.7820 1.8180 1.7640 1.8360 1.7865 1.8288 1.7685 1.8468 0.072 0.126
R3117x19xA/C 1.8810 1.9190 1.8620 1.9380 1.8857 1.9304 1.8667 1.9494 0.076 0.133
R3117x20xA/C 1.9800 2.0200 1.9600 2.0400 1.9850 2.0320 1.9650 2.0520 0.080 0.140
R3117x21xA/C 2.0790 2.1210 2.0580 2.1420 2.0842 2.1336 2.0632 2.1546 0.084 0.147
R3117x22xA/C 2.1780 2.2220 2.1560 2.2440 2.1835 2.2352 2.1615 2.2572 0.088 0.154
R3117x23xA/C 2.2770 2.3230 2.2540 2.3460 2.2827 2.3368 2.2597 2.3598 0.092 0.161
R3117x24xA/C 2.3760 2.4240 2.3520 2.4480 2.3820 2.4384 2.3580 2.4624 0.096 0.168
R3117x25xA/C 2.4750 2.5250 2.4500 2.5500 2.4812 2.5400 2.4562 2.5650 0.100 0.175
R3117x26xA/C 2.5740 2.6260 2.5480 2.6520 2.5805 2.6416 2.5545 2.6676 0.104 0.182
R3117x27xA/C 2.6730 2.7270 2.6460 2.7540 2.6797 2.7432 2.6527 2.7702 0.108 0.189
R3117x28xA/C 2.7720 2.8280 2.7440 2.8560 2.7790 2.8448 2.7510 2.8728 0.112 0.196
R3117x29xA/C 2.8710 2.9290 2.8420 2.9580 2.8782 2.9464 2.8492 2.9754 0.116 0.203
R3117x30xA/C 2.9700 3.0300 2.9400 3.0600 2.9775 3.0480 2.9475 3.0780 0.120 0.210
R3117x31xA/C 3.0690 3.1310 3.0380 3.1620 3.0767 3.1496 3.0457 3.1806 0.124 0.217
R3117x32xA/C 3.1680 3.2320 3.1360 3.2640 3.1760 3.2512 3.1440 3.2832 0.128 0.224
R3117x33xA/C 3.2670 3.3330 3.2340 3.3660 3.2752 3.3528 3.2422 3.3858 0.132 0.231
R3117x34xA/C 3.3660 3.4340 3.3320 3.4680 3.3745 3.4544 3.3405 3.4884 0.136 0.238
R3117x35xA/C 3.4650 3.5350 3.4300 3.5700 3.4737 3.5560 3.4387 3.5910 0.140 0.245
R3117x36xA/C 3.5640 3.6360 3.5280 3.6720 3.5730 3.6576 3.5370 3.6936 0.144 0.252
R3117x37xA/C 3.6630 3.7370 3.6260 3.7740 3.6722 3.7592 3.6352 3.7962 0.148 0.259
R3117x38xA/C 3.7620 3.8380 3.7240 3.8760 3.7715 3.8608 3.7335 3.8988 0.152 0.266
R3117x39xA/C 3.8610 3.9390 3.8220 3.9780 3.8707 3.9624 3.8317 4.0014 0.156 0.273
R3117x40xA/C 3.9600 4.0400 3.9200 4.0800 3.9700 4.0640 3.9300 4.1040 0.160 0.280
R3117x41xA/C 4.0590 4.1410 4.0180 4.1820 4.0692 4.1656 4.0282 4.2066 0.164 0.287
R3117x42xA/C 4.1580 4.2420 4.1160 4.2840 4.1685 4.2672 4.1265 4.3092 0.168 0.294
R3117x43xA/C 4.2570 4.3430 4.2140 4.3860 4.2677 4.3688 4.2247 4.4118 0.172 0.301
R3117x44xA/C 4.3560 4.4440 4.3120 4.4880 4.3670 4.4704 4.3230 4.5144 0.176 0.308
R3117x45xA/C 4.4550 4.5450 4.4100 4.5900 4.4662 4.5720 4.4212 4.6170 0.180 0.315
R3117x46xA/C 4.5540 4.6460 4.5080 4.6920 4.5655 4.6736 4.5195 4.7196 0.184 0.322
R3117x47xA/C 4.6530 4.7470 4.6060 4.7940 4.6647 4.7752 4.6177 4.8222 0.188 0.329
R3117x48xA/C 4.7520 4.8480 4.7040 4.8960 4.7640 4.8768 4.7160 4.9248 0.192 0.336
R3117x49xA/C 4.8510 4.9490 4.8020 4.9980 4.8632 4.9784 4.8142 5.0274 0.196 0.343
R3117x50xA/C 4.9500 5.0500 4.9000 5.1000 4.9625 5.0800 4.9125 5.1300 0.200 0.350

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ELECTRICAL CHARACTERISTICS BY DETECTOR THRESHOLD

• R3117x07xA/C to R3117x50xA/C
are checked and guaranteed by design engineering at −40°CTopt105°C, unless otherwise noted.
Topt=25°C
Nch Driver Output Nch Driver Output Pch Driver Output Detector Output Release Output
Sense Resistor
Current 1 Current2 Current Delay Time Delay Time
RSENSE [MΩ] IOUT1 [µA] IOUT2 [mA] IOUT3 [mA] tPHL [µs] tPLH [µs]
Min. Typ. Cond. Min. Cond. Min. Cond. Min. Cond. Typ. Cond. Typ.

VDD=
0.6V
0.020
VDS= VDD=
6 25 0.5V 5.0V 80
VSENSE=
VDD=
6.0V
1.0V
0.400 ↓
VDS= 0V
0.5V
∗Note)

VDD=
5.0V
VDD= VSENSE=
VDD= 4.5V
1.5V 0.650 0V
1.000 VDS= ↓
VDS= 2.1V -VDET
0.5V +2.0V 40
VDD=
0.6V ∗Note)
7
VDS=
0.05V
5
VDD=
5.0V
40 40
VSENSE=
6.0V
↓
-VDET
-2.0V

VDD= ∗Note)
3.0V
2.400
VDS=
0.5V VDD=
5.0V
VDD=
6.0V VSENSE=
0.900 0V
VDS=
↓
2.1V
6.0V 80
10
∗Note)

Note) 1. In the case of CMOS output type:

Time interval from forcing pulsive 6.0V to -VDET-2.0V or 0V, or from forcing 0V to -VDET+2.0V or 6.0V to
SENSE pin, to when the output voltage will reach VDD/2.
2. In the case of Nch Open drain output type:
Output pin is pulled up to 5V with 470kΩ and time interval from forcing 6.0V to -VDET-2.0V or 0V, or forcing
pulsive 0V to -VDET+2.0V or 6.0V to when the output voltage reaches up to 2.5V.

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TIMING CHART
Supply Voltage
(VDD)
Minimum Operating VDDL
Voltage
Detector Threshold Detector Threshold
Released Voltage +VDET Hysteresis Hysteresis
Detector Threshold -VDET
SENSE Pin Voltage
(VSENSE) GND

Pull-up Voltage Supply Voltage

(VDD)
Output Voltage
(VOUT)
GND

tPHL tPLH tPHL tPLH

R3117xxxxA R3117xxxxC

If the SENSE pin voltage is raised 0.5V/ms or less, it may cause noise when the output voltage is switched
from low to high.

DEFINITION OF OUTPUT DELAY TIME

Output Delay Time (tPLH) is defined as follows:

1. In the case of Nch Open Drain Output:

Under the condition of the output pin (DOUT) is pulled up through a resistor of 470kΩ to 5V, the time interval
between the rising edge of SENSE Pin pulse from 0V to (-VDET)+2.0V or the time interval of 6.0V pulse voltage
is supplied, the becoming of the output voltage to 2.5V.

2. In the case of CMOS Output:

The time interval between the rising edge of SENSE Pin pulse from 0V to (-VDET)+2.0V or the time interval of
6.0V pulse voltage is supplied, the becoming of the output voltage to VDD/2.

Supply Voltage (VDD) Supply Voltage (VDD)

Minimum Operating VDDL Minimum Operating Voltage VDDL

Voltage
-VDET+2.0V or 6.0V -VDET+2.0V or 6.0V
SENSE Pin Voltage
(VSENSE) SENSE Pin Voltage (VSENSE)

GND GND
5.0V 5.0V
Output Voltage
(VOUT) 2.5V VDD/2
Output Voltage (VOUT)
GND GND
tPHL tPLH tPHL tPLH
Nch Open Drain Output CMOS Output
(R3117xxxxA) (R3117xxxxC)

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OPERATION
• Operation of R3117xxxxA
SENSE
VDD
Ra Comparator
DOUT pin should be pulled-up to
DOUT VDD or an external voltage level.

Rb
Vref Nch
Tr.1
Rc
GND

Block Diagram (R3117xxxxA)

1 2 3
Supply Voltage (VDD)
Minimum Operating VDDL
Voltage
Step 1 2 3

Released Voltage +VDET Comparator (−)

Detector Threshold B I II I
A Hysteresis Pin Input Voltage
Detector Threshold −VDET

SENSE Pin Voltage Comparator Output L H L

(VSENSE) Tr.1 OFF ON OFF
GND Output Tr. Nch OFF ON OFF

Rb+Rc
I ×VSENSE
Ra+Rb+Rc
Pull-up Voltage
Output
Rb
Detect Delay Time Delay Time II ×VSENSE
Ra+Rb
Output Voltage tPHL tPLH
(VOUT)
GND
Operation Diagram

• Explanation of operation
Step 1. The output voltage is equal to the pull-up voltage.
Step 2. At Point "A", Vref >
= VSENSE×(Rb+Rc)/(Ra+Rb+Rc) is true, as a result, the output of comparator is reversed
from "L" to "H", therefore the output voltage becomes the GND level. The voltage level of Point A means
a detector threshold voltage (-VDET). (When the supply voltage is lower than the minimum operating
voltage, the operation of the output transistor becomes indefinite. The output voltage is equal to the GND
level.)
Step 3. At Point "B", Vref <
= VSENSE×Rb/(Ra+Rb) is true, as a result, the output of comparator is reversed from "H"
to "L", then the output voltage is equal to the pull-up voltage. The voltage level of Point B means a
released voltage (+VDET).
∗) The difference between a released voltage and a detector threshold voltage is a detector threshold hysteresis.

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• Operation of R3117xxxxC
SENSE

VDD

Ra Comparator Pch

DOUT

Rb
Vref Nch
Tr.1
Rc
GND
Block Diagram (R3117xxxxC)

1 2 3
Supply Voltage (VDD)
Minimum Operating VDDL
Voltage Step 1 2 3

Comparator (−)
I II I
Pin Input Voltage
Released Voltage +VDET Detector Threshold B
A Hysteresis Comparator Output L H L
Detector Threshold −VDET
Tr.1 OFF ON OFF
SENSE Pin Voltage
Pch ON OFF ON
(VSENSE) Output Tr.
GND
Nch OFF ON OFF

Rb+Rc
I ×VSENSE
Ra+Rb+Rc
Supply Voltage (VDD)
Output Rb
Detect Delay Time Delay Time II ×VSENSE
Ra+Rb
Output Voltage tPHL tPLH
(VOUT)
GND
Operation Diagram

• Explanation of operation
Step 1. The output voltage is equal to the supply voltage (VDD).
Step 2. At Point "A", Vref >
= VSENSE×(Rb+Rc)/(Ra+Rb+Rc) is true, as a result, the output of comparator is reversed
from "L" to "H", therefore the output voltage becomes the GND level. The voltage level of Point A means
a detector threshold voltage (-VDET). (When the supply voltage is lower than the minimum operating
voltage, the operation of the output transistor becomes indefinite. The output voltage is equal to the GND
level.
Step 3. At Point "B", Vref <
= VSENSE×Rb/(Ra+Rb) is true, as a result, the output of comparator is reversed from "H"
to "L", then the output voltage is equal to the supply voltage (VDD). The voltage level of Point B means a
released voltage (+VDET).
∗) The difference between a released voltage and a detector threshold voltage is a detector threshold hysteresis.

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Power supply injection order

The R3117xxxxA/C Series supervise the voltage of the SENSE pin. VDD pin and SENSE pin can be used at the
same voltage level. Likewise, VDD pin and SENSE pin can be used at the different voltage level. If the VDD pin and
SENSE pin are used at different voltage level, regarding the start-up sequence, force the voltage level to VDD pin
prior to the SENSE pin.
If the SENSE pin voltage is equal or more than the released voltage (+VDET), DOUT pin becomes "H". Besides,
a voltage beyond VDD pin is also acceptable to SENSE pin. Concerning the R3117xxxxA series (Nch open drain
output type), DOUT pin must be pulled-up with an external resistor.

VDD

+VDET
VSENSE

VOUT

Fig.1 Turn on sequence

Outside setting of the detection voltage

To monitor the voltage more than 5.0V or if the different detector threshold with using lower threshold device,
divider resistors can be applied to the SENSE pin. In this usage, some error range will be generated to the
detector threshold voltage caused by the internal resistor RSENSE (Fig.3) of the IC. Supposed that the detector
threshold voltage is described as Vs, the next equation will be true.
VS = -VDET × (Ra+Rb)/Rb.
However, actually an error includes by SENSE resistance (RSENSE) of the IC inside. (Figure 3)
Ia = Ib + ISENSE ....................................... (1)
Ib = -VDET / Rb ....................................... (2)
Thus,
Ia = -VDET / Rb + ISENSE ....................................... (3)
Therefore,
VS = -VDET + Ia × Ra ....................................... (4)

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Put Equation (3) into Equation (4), then

VS = -VDET × (Ra + Rb) / Rb + Ra × ISENSE
Ra × ISENSE is an error in VS.
Ra × ISENSE = Ra × (-VDET) / RSENSE
= -VDET × Ra / RSENSE
The error range is -VDET × Ra/RSENSE (Fig.3) and to make it small, choosing the low detector threshold voltage
type and set the resistance values Ra, Rb as RSENSE >>Ra. Refer to the electrical characteristics table to see the
RSENSE value.

Vs VDD Vs

Ra VDD Ra Ia R3117x
SENSE Series
-VDET R3117x -VDET
Series
SENSE DOUT ISENSE RSENSE
Rb Rb Ib
GND GND

Fig.2 Fig.3

Accuracy Detector Threshold

If the VDD bias voltage is lager than 5.25V, and to keep the detector threshold accuracy level, or if the maximum
operating voltage line must be used as the VDD bias voltage, the input voltage must be set low by using the divider
resistors which are shown in Fig.4.

VB

Vs R1

Ra VDD
SENSE R2
R3117x
-VDET
Series
DOUT
Rb
GND

Fig.4

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Detector Operation vs. glitch input voltage to the SENSE pin

When the R3117x is at released, if the pulse voltage which the detector threshold or lower voltage, the graph
below means that the relation between pulse width and the amplitude of the swing to keep the released state for
the R3117x.

Pulse Width
Sense Voltage (VSENSE)

Detector Threshold (-VDET)

Over Drive

VSENSE Input Waveform

This graph shows the maximum pulse conditions to keep the released voltage. If the pulse with larger amplitude
or wider width than the graph above, is input to SENSE pin, the reset signal may be output.

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TEST CIRCUITS

ISS

5V or VDD
VDD VDD
470kΩ
R3117x R3117x
VIN VOUT
VIN Series Series
SENSE SENSE DOUT

GND GND

Supply Current Test Circuit Detector Threshold Test Circuit

(Pull-up circuit is not necessary for
CMOS Output type.)

VDD VDD VDS

IOUT IOUT
R3117x R3117x
VIN Series VIN Series
SENSE DOUT SENSE DOUT VDD−VDS
VDS
GND GND

Nch Driver Output Current Test Circuit Pch Driver Output Current Test Circuit
∗Apply to CMOS Output type only

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TYPICAL CHARACTERISTICS
1) Supply Current vs. Supply Voltage

R3117xxxxA/C (at released) R3117xxxxA/C (at detect)

2) Detector Threshold vs. Temperature

R3117x07xA/C R3117x30xA/C

R3117x50xA/C

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3) Detector Threshold vs. Supply Voltage

R3117x07xA/C R3117x30xA/C

R3117x50xA/C

4) Hysteresis vs. Supply Voltage

R3117x07xA/C R3117x30xA/C

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R3117x50xA/C

5) Output Voltage vs. SENSE pin Input Voltage (Nch Open Drain Output type is pulled up to VDD.)

R3117x07xA/C R3117x30xA/C

R3117x50xA/C

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6) Nch Driver Output Current vs. Supply Voltage 7) Nch Driver Output Current vs. VDS

R3117xxxxA/C R3117xxxxA/C

8) Pch Driver Output Current vs. Supply Voltage 9) Pch Driver Output Current vs. VDS

R3117xxxxC R3117xxxxC

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TYPICAL APPLICATION

• R3117xxxxA CPU Reset Circuit (Nch Open Drain Output)

(1) Input Voltage to R3117xxxxA is equal to Input Voltage to CPU

VDD
470kΩ R
VDD VDD
CPU
Vs R3117xxxxA
Series RESET
SENSE DOUT
GND GND

(2) Input Voltage to R3117xxxxA is unequal to Input Voltage to CPU

VDD1 VDD2
470kΩ R
VDD VDD

R3117xxxxA CPU
Vs
Series RESET
SENSE DOUT
GND GND

• R3117xxxxC CPU Reset Circuit (CMOS Output)

VDD

VDD VDD

R3117xxxxC CPU
Vs
Series RESET
SENSE DOUT
GND GND

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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 100 kΩ or less as a guide, and connect C IN of 0.1 μF 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 a result, make sure that the cross conduction
current has no problem.

R1 R1

VDD VDD
*2 *2
CIN Voltage R2 CIN Voltage
OUT pin OUT pin
Detector Detector

GND GND

Figure A Figure B

*1 In the CMOS output type, a charging current for OUT pin is included.
*2 Note the bias dependence of capacitors.

20
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