R3117x SERIES
LOW VOLTAGE DETECTOR with SENSE pin
NO.EA-186-080617
1
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(PLP)1010-4 are available.
FEATURES
Supply Current ......................................................................Typ. 0.29µA (VDD=6.0V)
Consumption current through SENSE pin is not included.
Range of Operating Voltage..................................................1.0V to 6.0V (-40°C
<
=
Topt
<
=
105°C)
Detector Threshold Range....................................................Stepwise setting with a step of 0.1V in the range
of 0.7V to 5.0V
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 ..............................................................................SOT-23-5, DFN(PLP)1010-4, SC-88A
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
R3117x
2
BLOCK DIAGRAMS
Nch Open Drain Output (R3117xxxxA) CMOS Output (R3117xxxxC)
DOUT
VDD
Vref
GND
SENSE
DOUT
VDD
Vref
GND
SENSE
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.
The selection can be made with designating the part number as shown below;
R3117xxxxx-xx-x Part Number
a b a' c d e
Code Contents
a, a'
Designation of Package Type;
DFN(PLP)1010-4 : R3117Kxx1x-xx-x
SOT-23-5 : R3117Nxx1x-xx-x
SC-88A : R3117Qxx2x-xx-x
b Setting Detector Threshold (-VDET);
Stepwise setting with a step of 0.1V in the range of 0.7V to 5.0V is possible.
c
Designation of Output Type;
A: Nch Open Drain
C: CMOS
d Designation of Taping Type ;
TR (Refer to Taping Specifications; TR type is the standard direction.)
e
Designation of Composition of pin plating
-F : Lead free solder plating (SOT-23-5, SC-88A)
None: Au plating (DFN(PLP)1010-4)
R3117x
3
PIN CONFIGURATIONS
DFN(PLP)1010-4*1
Top View
21
34
Bottom View
12
43
SOT-23-5 SC-88A
1
4
5
2 3
(mark side)
54
13
2
(mark side)
PIN DESCRIPTIONS
DFN(PLP)1010-4*1
SOT-23-5
Pin No. Symbol Description Pin No. Symbol Description
1 DOUT Output Pin
("L" at detection, "H" at released) 1 DOUT Output Pin
("L" at detection, "H" at released)
2 SENSE
Voltage Detector Voltage Sense Pin
2 VDD Input Pin
3 GND Ground Pin 3 GND Ground Pin
4 VDD Input Pin 4 NC No Connection
5 SENSE
Voltage Detector Voltage Sense Pin
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, "H" at released)
*1) Tab in the parts have GND level.
(They are connected to the back side of this IC.)
Do not connect to other wires or land patterns.
*2) In terms of NC pin of SC-88A, connect it to the
GND or use it as o
p
en.
R3117x
4
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) VSS0.3 to 7.0
VOUT
Output Voltage (CMOS Output) VSS0.3 to VDD+0.3
V
IOUT Output Current 20 mA
Power Dissipation (SOT-23-5)* 420
Power Dissipation (DFN(PLP)1010-4)* 400
PD
Power Dissipation (SC-88A)* 380
mW
Topt Operating Temperature Range 40 to 105 °C
Tstg Storage Temperature Range 55 to 125 °C
* ) For Power Dissipation, please refer to PACKAGE INFORMATION to be described.
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 5.25V < VDD
<
=
6.0V -VDET-11 -VDET+24 mV
1.0V
<
=
VDD
<
=
5.25V -VDET
×0.99 -VDET
×1.01
-VDET Detector Threshold
(Topt=25°C) 1.6V
<
=
-VDET
<
=
5.0V
5.25V < VDD
<
=
6.0V -VDET
×0.9925 -VDET
×1.016
V
1.0V
<
=
VDD
<
=
5.25V -VDET-30 -VDET+30
0.7V
<
=
-VDET<1.6V 5.25V < VDD
<
=
6.0V -VDET-26 -VDET+39 mV
1.0V
<
=
VDD
<
=
5.25V -VDET
×0.98
-VDET
×1.02
-VDET Detector Threshold
(-40°C
<
=
Topt
<
=
105°C)
1.6V
<
=
-VDET
<
=
5.0V
5.25V < VDD
<
=
6.0V -VDET
×0.9825
-VDET
×1.026
V
VHYS Detector Threshold
Hysteresis VDD=1.0V to 6.0V -VDET
×0.04
-VDET
×0.07 V
VSENSE=-VDET-0.1V 0.31 1.47
ISS Supply Current*1 VSENSE=-VDET×1.1 0.29 1.25
µA
R3117x
5
Symbol Item Conditions Min. Typ. Max. Unit
-VDET < 1.5V 6 25
1.5V
<
=
-VDET < 4.7V 5 40
RSENSE Sense Resistor
4.7V
<
=
-VDET 10 40
M
VDD Operating Voltage -40°C
<
=
Topt
<
=
105°C 1.0 6.0 V
Topt=25°C 0.50
VDDL Minimum Operating
Voltage*2 -40°C
<
=
Topt
<
=
105°C
0.55 V
VDD=0.6V, VDS=0.05V 7 µA
-VDET < 1.1V VDD=0.6V
VDS=0.5V 0.020
1.1V
<
=
-VDET < 1.6V VDD=1.0V
VDS=0.5V 0.400
1.6V
<
=
-VDET < 3.1V VDD=1.5V
VDS=0.5V 1.000
Nch
3.1V
<
=
-VDET VDD=3.0V
VDS=0.5V 2.400
mA
-VDET < 4.0V VDD=4.5V
VDS=2.1V 0.650
IOUT Output Current
(Driver Output Pin)
Pch*3
4.0V
<
=
-VDET VDD=6.0V
VDS=2.1V 0.900
mA
ILEAK Nch Driver Leakage
Current*4 VDD=6.0V, VDS=7.0V
140 nA
-VDET/
Topt
Detector Threshold
Temperature
Coefficient
-40°C
<
=
Topt
<
=
105°C ±30 ppm
/°C
-VDET < 1.5V 80
tPHL Detector Output Delay
Time*5 VDD=5V 1.5V
<
=
-VDET 40 µs
-VDET < 4.5V 40
tPLH Release Output Delay
Time*5 VDD=5V 4.5V
<
=
-VDET 80 µs
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 470k 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 470k 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.
R3117x
6
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
1.0V
<
=
VDD
<
=
5.25V
Detector Threshold
1.0V
<
=
VDD
<
=
5.25V
Detector Threshold
5.25V < VDD
<
=
6.0V
Detector Threshold
5.25V < VDD
<
=
6.0V
Detector Threshold
Hysteresis
-VDET [V] -VDET [V] -VDET [V] -VDET [V] VHYS [V]
Part
Number
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
R3117x
7
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
Sense Resistor Nch Driver Output
Current 1
Nch Driver Output
Current2
Pch Driver Output
Current
Detector Output
Delay Time
Release Output
Delay Time
RSENSE [M] 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
VDS=
0.5V
0.020
6 25 80
VDD=
1.0V
VDS=
0.5V
0.400
VDD=
5.0V
VSENSE=
6.0V
0V
Note)
VDD=
1.5V
VDS=
0.5V
1.000
VDD=
4.5V
VDS=
2.1V
0.650
VDD=
5.0V
VSENSE=
0V
-VDET
+2.0V
Note)
40
5
10
40
VDD=
0.6V
VDS=
0.05V
7
VDD=
3.0V
VDS=
0.5V
2.400
VDD=
6.0V
VDS=
2.1V
0.900
VDD=
5.0V
VSENSE=
6.0V
-VDET
-2.0V
Note)
40
VDD=
5.0V
VSENSE=
0V
6.0V
Note)
80
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 470k 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.
R3117x
8
TIMING CHART
Detector Threshold
H
y
steresis
tPLH
GND
GND
VDDL
-
VDET
+VDET
Detector Threshold
Released Voltage
Minimum Operating
Voltage
Pull-up Voltage
SENSE Pin Voltage
(VSENSE)
Output Voltage
(VOUT)
R3117xxxxA
tPLH
R3117xxxxC
tPHL tPHL
Supply Voltage
(VDD)
Detector Threshold
Hysteresis
Supply Voltage
(VDD)
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 470k 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.
-VDET+2.0V or 6.0V
GND
5.0V
2.5V
GND
tPLH tPHL
VDDL
Minimum Operating
Voltage
Supply Voltage (VDD)
Output Voltage
(VOUT)
SENSE Pin Voltage
(VSENSE)
GND
GND
tPLH
tPHL
-VDET+2.0V or 6.0V
5.0V
VDD/2
VDDL
Minimum Operating Voltage
Supply Voltage (VDD)
Output Voltage (VOUT)
SENSE Pin Voltage (VSENSE)
Nch Open Drain Output CMOS Output
(R3117xxxxA) (R3117xxxxC)
R3117x
9
OPERATION
Operation of R3117xxxxA
Vref
Ra
Rb
Rc
VDD
DOUT
GND
Tr.1 Nch
Com
arato
SENSE
DOUT pin should be pulled-up to
VDD or an external voltage level.
Block Diagram (R3117xxxxA)
+VDET
VDET
1 2 3
VDDL
GND
GND
A
B
tPLH
tPHL
Supply Voltage (VDD)
Output Voltage
(VOUT)
SENSE Pin Voltage
(VSENSE)
Detector Threshold
Hysteresis
Detector Threshold
Released Voltage
Pull-up Voltage
Detect Delay Time
Output
Delay Time
Minimum Operating
Voltage
Step 1 2 3
Comparator ()
Pin Input Voltage I II I
Comparator Output L H L
Tr.1 OFF ON OFF
Output Tr. Nch OFF ON OFF
I×VSENSE
Rb+Rc
Ra+Rb+Rc
II ×VSENSE
Rb
Ra+Rb
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 "H" to "L", 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 "L"
to "H", 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.
R3117x
10
Operation of R3117xxxxC
Vref
Ra
Rb
Rc
VDD
DOUT
GND
Tr.1 Nch
Com
arato
Pch
SENSE
Block Diagram (R3117xxxxC)
12 3
GND
GND
A
B
tPLH
tPHL
+VDET
VDET
VDDL
Supply Voltage (VDD)
Output Voltage
(VOUT)
SENSE Pin Voltage
(VSENSE)
Detector Threshold
Hysteresis
Detector Threshold
Released Voltage
Detect Delay Time
Output
Delay Time
Minimum Operating
Voltage
Supply Voltage (VDD)
Step 1 2 3
Comparator ()
Pin Input Voltage I II I
Comparator Output L H L
Tr.1 OFF ON OFF
Pch ON OFF ON
Output Tr. Nch OFF ON OFF
I×VSENSE
Rb+Rc
Ra+Rb+Rc
II ×VSENSE
Rb
Ra+Rb
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 "H" to "L", 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 "L"
to "H", 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.
R3117x
11
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.
t
VDD
VOUT
VSENSE
+VDET
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)
R3117x
12
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.
VDD
SENSE
GND
R3117x
Series DOUT
-VDET
Ra
Rb
Vs VDD
RSENSE
SENSE
GND
R3117x
Series
-VDET
Ra
Rb
Vs
ISENSE
Ia
Ib
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.
VDD
GND
R3117x
Series DOUT
SENSE
-VDET
Ra
Rb
Vs
R2
R1
VB
Fig.4
R3117x
13
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.
1 100 100010
Over Drive Voltage
(mV)
Pulse Width
(µs)
40
20
0
140
80
60
100
120
R3117x07xA/C
R3117x50xA/C
Detector Threshold (-VDET)
Ove
r
Drive
Pulse Width
Sense Voltage (VSENSE)
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.
R3117x
14
TEST CIRCUITS
ISS
VIN
VDD
SENSE
GND
R3117x
Series
470k
5V or VDD
VOUT
VIN
VDD
SENSE
GND
R3117x
Series DOUT
Supply Current Test Circuit Detector Threshold Test Circuit
(Pull-up circuit is not necessary for
CMOS Output type.)
VDS
IOUT
VIN
VDD
SENSE
GND
R3117x
Series DOUT
VDDVDS
IOUT
VIN
VDD
SENSE
GND
R3117x
Series DOUT
VDS
Nch Driver Output Current Test Circuit Pch Driver Output Current Test Circuit
Apply to CMOS Output type only
R3117x
15
TYPICAL CHARACTERISTICS
1) Supply Current vs. Supply Voltage
R3117xxxxA/C (at released) R3117xxxxA/C (at detect)
0425631
Supply Voltage VDD (V)
Supply Current ISS (µA)
0
1.0
0.6
0.4
0.2
0.8
Topt=105°C
Topt=25°C
Topt=-
40°C
0425631
Supply Voltage VDD (V)
Supply Current ISS (µA)
0
1.0
0.6
0.4
0.2
0.8
Topt=105°C
Topt=25°C
Topt=-
40°C
2) Detector Threshold vs. Temperature
R3117x07xA/C R3117x30xA/C
Temperature Topt
(°C)
Detector Threshold V
DET
(V)
0.69
0.75
0.74
0.73
0.72
0.71
0.70
-40 7550025-25 100105
V
DD
=5.0V
-VDET
+VDET
Temperature Topt
(°C)
Detector Threshold V
DET
(V)
2.95
3.20
3.15
3.10
3.05
3.00
-40 7550025-25 100105
V
DD
=5.0V
-VDET
+VDET
R3117x50xA/C
Temperature Topt
(°C)
Detector Threshold V
DET
(V)
4.95
5.35
5.25
5.30
5.20
5.15
5.10
5.05
5.00
-40 7550025-25 100105
V
DD
=5.0V
-VDET
+VDET
R3117x
16
3) Detector Threshold vs. Supply Voltage
R3117x07xA/C R3117x30xA/C
153426
Supply Voltage VDD (V)
Detector Threshold VDET (V)
0.692
0.708
0.702
0.700
0.696
0.698
0.694
0.704
0.706 Topt=-
40°C
Topt=25°C
Topt=105°C
153426
Supply Voltage VDD (V)
Detector Threshold VDET (V)
2.97
3.03
3.00
2.99
2.98
3.01
3.02 Topt=-
40°C
Topt=25°C
Topt=105°C
R3117x50xA/C
153426
Supply Voltage V
DD
(V)
Detector Threshold V
DET
(V)
4.95
5.05
5.00
4.99
4.97
4.98
4.96
5.02
5.04
5.01
5.03 Topt=-
40°C
Topt=25°C
Topt=105°C
4) Hysteresis vs. Supply Voltage
R3117x07xA/C R3117x30xA/C
145326
Supply Voltage VDD (V)
Detector Threshold Hysteresis VHYS (V)
0.028
0.049
0.042
0.035
Topt=-
40°C
Topt=25°C
Topt=105°C
145326
Supply Voltage V
DD
(V)
Detector Threshold Hysteresis V
HYS
(V)
0.12
0.21
0.18
0.15
Topt=-
40°C
Topt=25°C
Topt=105°C
R3117x
17
R3117x50xA/C
145326
Supply Voltage V
DD
(V)
Detector Threshold Hysteresis V
HYS
(V)
0.20
0.35
0.30
0.25
Topt=-
40°C
Topt=25°C
Topt=105°C
5) Output Voltage vs. SENSE pin Input Voltage (Nch Open Drain Output type is pulled up to VDD.)
R3117x07xA/C R3117x30xA/C
0 1.50.5 1.0 2.0
Sense Voltage V
SENSE
(V)
Output Voltage V
OUT
(V)
0
6
4
2
3
1
5
Topt=25°C
V
DD
=5.0V
V
DD
=3.0V
V
DD
=1.0V
03412 5
Sense Voltage V
SENSE
(V)
Output Voltage V
OUT
(V)
0
6
4
2
3
1
5
Topt=25°C
V
DD
=5.0V
V
DD
=3.0V
V
DD
=1.0V
R3117x50xA/C
03412 56
Sense Voltage V
SENSE
(V)
Output Voltage V
OUT
(V)
0
6
4
2
3
1
5
Topt=25°C
V
DD
=5.0V
V
DD
=3.0V
V
DD
=1.0V
R3117x
18
6) Nch Driver Output Current vs. Supply Voltage 7) Nch Driver Output Current vs. VDS
R3117xxxxA/C R3117xxxxA/C
0425316
Supply Voltage V
DD
(V)
Nch Driver Output Current I
OUT
(mA)
0
10
6
8
4
2
Topt=-
40°C
Topt=25°C
Topt=105°C
V
DS
=0.5V
0 1.51.00.5 2.0
V
DS
(V)
Nch Driver Output Current I
OUT
(mA)
0
30
10
20
V
DD
=5.0V
V
DD
=4.0V
V
DD
=6.0V
V
DD
=3.0V
V
DD
=2.0V
V
DD
=1.0V
Topt=25°C
8) Pch Driver Output Current vs. Supply Voltage 9) Pch Driver Output Current vs. VDS
R3117xxxxC R3117xxxxC
0452316
Supply Voltage V
DD
(V)
Pch Driver Output Current I
OUT
(mA)
0
2.0
1.5
1.0
0.5
Topt=-
40°C
Topt=25°C
Topt=105°C
V
DS
=2.1V
0425316
V
DS
(V)
Pch Driver Output Current I
OUT
(mA)
0
2.5
1.0
0.5
1.5
2.0
V
DD
=5.0V
V
DD
=4.0V
V
DD
=6.0V
V
DD
=3.0V
V
DD
=2.0V
V
DD
=1.0V
Topt=25°C
R3117x
19
TYPICAL APPLICATION
R3117xxxxA CPU Reset Circuit (Nch Open Drain Output)
(1) Input Voltage to R3117xxxxA is equal to Input Voltage to CPU
R
VDD
RESET
CPU
GND
VDD
470k
Vs
VDD
SENSE
GND
R3117xxxxA
Series DOUT
(2) Input Voltage to R3117xxxxA is unequal to Input Voltage to CPU
VDD1
R
VDD
RESET
CPU
GND
VDD2
470k
Vs
VDD
SENSE
GND
R3117xxxxA
Series DOUT
R3117xxxxC CPU Reset Circuit (CMOS Output)
VDD
RESET
CPU
GND
VDD
Vs
VDD
SENSE
GND
R3117xxxxC
Series DOUT
R3117x
20
TECHNICAL NOTES
When R3117xxxxA/C is used in the circuit as SENSE pin and VDD pin are connected each other such as in
Figure A, if the value of R1 is set excessively large, the dropdown voltage caused by the consumption current of
IC itself, may vary the detector threshold and the released voltage. Also, if the value of R1 is set excessively
large, there may cause oscillation generated by cross conduction current with released operation.
When R3117xxxxA/C is used in the circuit as SENSE pin and VDD pin are connected each other such as in
Figure B, if the value of R1 is set excessively large, the dropdown voltage caused by the consumption current of
IC itself, may vary the detecor threshold and the released voltage.
Also, if the value of R1 is set excessively large, there may be delay in start-up and may cause oscillation
generated by cross conduction current. Furthermore, if the value of R1 is set large and the value of R2 is set
small, released voltage level may shift and the minimum operating voltage may differ. If the value of R2 is set
excessively small from R1, release may not occur and may cause oscillation.
R2
R1
R3117x Series
GND
VDD
R1
VDD VDD
R3117x Series
GND
VDD
DOUT DOUT
SENSE SENSE
Figure A Figure B