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2001. Apr. 4
LOW VOLTAGE DETECTOR WITH OUTPUT DELAY
R3112xxx1A/C Series
s OUTLINE
The R3112 Series are voltage detector ICs with high detector threshold accuracy and ultra-low supply current by CMOS process, 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, resistor net for detector threshold setting, an output driver, a hysteresis circuit, and an output delay circuit. The detector threshold is fixed with high accuracy internally and does not require any adjustment. Two output types, Nch open drain type and CMOS type are available. Two types of packages, SOT-23-5 and ultra small SC-82AB can be selected so that high density mounting on boards is possible.
s FEATURES
qBuilt-in Output Delay Circuit* * * * * * * * * * *TYP. 100ms with an external capacitor: 0.022F qUltra-low Supply Current* * * * * * * * * * *TYP. 1.0A (VDD=3.5V) qWide Range of Operating Voltage * * * * * *0.76.0V(Topt=25C) qDetector Threshold * * * * * * * * *Stepwise setting with a step of 0.1V in the range of 0.9V to 5.0V is possible. qHigh Accuracy Detector Threshold * * * * * * * 2.0% qLow Temperature-Drift Coefficient of Detector Threshold* * * * * * * * * TYP. 100ppm/C qTwo Output Types* * * * * * * * * * * * * * * * * * * Nch Open Drain and CMOS qTwo Types of Packages * * * * * * * * * * SOT-23-5 (Mini-mold), SC-82AB
s APPLICATIONS * CPU and Logic Circuit Reset * Battery Checker * Window Comparator * Wave Shaping Circuit * Battery Back-up Circuit * Power Failure Detector s BLOCK DIAGRAMS
R3112XXX1A
VDD RD
OUT
R3112XXX1C
VDD
+
Vref
Vref
RD
+ -OUT
GND
GND
CD
CD
Rev. 1.10
-1-
s OPERATION
VDD RD
Tr.1 Tr.2 Nch Rc GND Schmitt Trigger Pch OUT
Current Source
Ra
Comparator
+
Rb
Vref
Output Capacitor
CD
Fig. 1 Block Diagram with an external capacitor
1 2 3 4 5
Released Voltage +VDET Detector Threshold Supply Voltage VDDL (VDD) Minimum Operating Voltage GND
Operation Status Comparator(-) Pin Input Voltage Comparator Output Tr.1, 2 Nch Output Tr.
1 L OFF OFF ON
2 H ON ON OFF
3
Indefinite Indefinite Indefinite Indefinite
4 H ON ON OFF
5 L OFF OFF ON
B
HYSTERESIS RANGE
-VDET
A
Output Voltage (OUT) Delay Time GND
Pch

Rb+Rc xVDD Ra+Rb+Rc Rb xVDD Ra+Rb
Fig. 2 Operation Diagram 1. Output Voltage is equal to Supply Voltage. (As for Nch Open Drain Type, equal to pull-up voltage.) 2. When the Supply Voltage is down to the detector threshold voltage level(Point A), VrefVDDx(Rb+Rc)/(Ra+Rb+Rc) is true, then output of the comparator is reversed from "L" to "H", therefore Output Voltage becomes GND level. 3. When the Supply Voltage is lower than Minimum Operating Voltage, the operation of Output Transistor is indefinite. In the case of Nch Open Drain Type, Output Voltage is equal to pull-up Voltage. 4. Output Voltage becomes GND level. 5. When the Supply Voltage is higher than released voltage (Point B), VrefVDDxRb/(Ra+Rb) is true, then Output of the comparator reaches the threshold level, and Output of Shmitt Trigger is reversed from "H" to "L", then Output Voltage is equal to Supply Voltage. (As for Nch Open Drain Type, equal to pull-up voltage.) *) The difference between Released Voltage and Detector Threshold Voltage means Hysteresis Range Voltage.
Rev. 1.10
-2-
qOperation of Output Delay
Supply Voltage
Released Voltage (+VDET)
Capacitor Voltage
CD Pin Threshold Voltage (VTCD) GND
Output Voltage GND Output Delay Time (tD) When the Supply Voltage which is higher than Released Voltage is forced to VDD pin, charge to an external capacitor starts, then capacitor voltage increases. Until the capacitor voltage reaches to CD Pin Threshold Voltage, Output Voltage maintains "L". When the capacitor voltage becomes higher than CD pin threshold voltage, Output Voltage is reversed from "L" to "H". Where, the time interval between the rising edge of Supply Voltage and Output Voltage Reverse point means Output Delay Time. q Output Delay Time Output Delay Time (tD) can be calculated with the next formula.
tD=0.69 RD CD(s)
RD is internal resistor and set at 6.5M(TYP.) typically. CD(F) describes the capacitance value of an external capacitor. Therefore,
tD=0.69 6.5 106 CD(s)
Rev. 1.10
-3-
s SELECTION GUIDE
The package type, the detector threshold, the output type, and the taping type of R3112 Series can be designated at the users' request by specifying the part number as follows; R3112xxx1x-xxPart Number ab c d Code a b Contents Designation of Package Type; Q:SC-82AB N:SOT-23-5 Setting Detector Threshold (-VDET); Stepwise setting with a step of 0.1V in the range of 0.9V to 5.0V is possible. Designation of Output Type; A: Nch Open Drain C: CMOS Designation of Packing or Taping Type ; Ex. SOT-23-5, SC-82AB: TR is prescribed as standard directions. (Refer to Taping Specifications)
c
d
s PIN CONFIGURATION
SOT-23-5
5 4
SC-82AB
4 3
MARK SIDE
MARK SIDE
1
2
3
1
2
s PIN DESCRIPTION
Pin No. 1 SOT-23-5 Symbol Description OUT Output Pin(Output "L" at detector threshold, Output "H" at released voltage) Voltage Supply Pin Ground Pin No Connection SC-82AB Pin No. Symbol 1 VDD Description Voltage Supply Pin
2 3 4
VDD GND NC
2 3 4
GND CD OUT
Ground Pin Pin for External Capacitor (for setting output delay) Output Pin(Output "L" at detector threshold, Output "H" at released voltage)
5
CD
Pin for External Capacitor (for setting output delay)
Rev. 1.10
-4-
sABSOLUTE MAXIMUM RATINGS
Symbol VDD VOUT1 VOUT2 IOUT PD Topt Tstg Tsolder Item Supply Voltage Output Voltage(CMOS) Output Voltage(Nch) Output Current Power Dissipation(SOT23-5) Power Dissipation(SC82-AB) Operating Temperature Range Storage Temperature Range Lead temperature (Soldering) Rating 6.5 VSS-0.3VDD+0.3 VSS-0.36.5 20 250 150 -4085 -55125 260C, 10s Unit V V V mA mW C C
ABSOLUTE MAXIMUM RATINGS Absolute Maximum ratings are threshold limit values that must not be exceeded ever for an instant under any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation above these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress ratings only and do not necessarily imply functional operation below these limits. qR3112x091A/C Symbol -VDET VHYS ISS VDDH VDDL Item Detector Threshold Detector Threshold Hysteresis Supply Current Maximum Operating Voltage Minimum Operating Voltage*Note1 Output Current (Driver Output Pin) Conditions Topt=25C MIN. TYP. 0.882 0.900 0.027 0.045 0.6 0.5 MAX. 0.918 0.063 2.0 2.0 6.0 0.70 0.80 10 0.05 120 0.9 Unit V V A V V A mA mA 0.693 V A M ppm/C
VDD=0.80V 1.90V
IOUT
Topt=25C -40C Topt 85C Nch VDS=0.05V,VDD=0.70V VDS=0.50V,VDD=0.85V
VTCD ICD RD -VDET/T
Pch VDS=-2.1V,VDD=4.5V 1.0 3.5 CD pin Threshold Voltage VDD=0.99V 0.297 0.495 CD pin Output Current VDS=0.10V, VDD=0.70V 2 70 10 400 VDS=0.50V, VDD=0.85V Output Delay Resistance 3.25 6.50 100 Detector Threshold -40C Topt 85C Temperature Coefficient
13.00
Rev. 1.10
-5-
qR3112x271A/C Symbol Item -VDET Detector Threshold VHYS Detector Threshold Hysteresis ISS Supply Current VDDH VDDL Maximum Operating Voltage Minimum Operating Voltage*Note1
Conditions
MIN. 2.646 0.081
TYP. 2.700 1.0 0.5
VDD=2.60V 3.70V Topt=25C -40C Topt85C Nch VDS=0.05V,VDD=0.70V VDS=0.50V,VDD=1.50V Pch VDS=-2.1V,VDD=4.5V VDD=2.97V VDS=0.1V, VDD=0.7V VDS=0.5V, VDD=1.5V -40C Topt85C
Topt=25C MAX. Unit 2.754 V 0.189 V 2.5 A 3.0 6.0 V 0.7 V 0.8 A mA mA 2.079 V A M ppm/C
IOUT
Output Current (Driver Output Pin) CD pin Threshold Voltage CD pin Output Current Output Delay Resistance Detector Threshold Temperature Coefficient
10 1.0 1.0 0.891 2.0 200 3.25
120 3.0 3.5 1.485 70 500 6.50 100
VTCD ICD RD -VDET/T
13.00
qR3112x501A/C
Symbol -VDET VHYS ISS VDDH VDDL Item Detector Threshold Detector Threshold Hysteresis Supply Current Maximum Operating Voltage Minimum Operating Voltage*Note1 Conditions MIN. 4.900 0.150 TYP. 5.000 0.250 1.5 0.6
VDD=4.9V 6.0V Topt=25C -40C Topt85C Nch VDS=0.05V,VDD=0.70V VDS=0.50V,VDD=1.50V Pch VDS=-2.1V,VDD=6.0V VDD=2.97V VDS=0.1V, VDD=0.7V VDS=0.5V, VDD=1.5V
Topt=25C MAX. Unit 5.100 V 0.350 V 2.5 A 3.0 6.0 V 0.7 V 0.8 A mA mA 3.850 V A M ppm/C
IOUT
Output Current (Driver Output Pin) CD pin Threshold Voltage CD pin Output Current Output Delay Resistance Detector Threshold Temperature Coefficient
10 1.0 1.5 1.650 2.0 200 3.25
120 3.0 4.5 2.750 70 500 6.50 100
VTCD ICD RD -VDET/T
13.00
-40CTopt85C
*Note1: Minimum Operating Voltage means the value of input voltage when output voltage maintains 0.1V or less. (In the case of Nch Open Drain Type, Output pin is pulled up with a resistance of 470k to 5.0V.)
Rev. 1.10
-6-
s TEST CIRCUITS
*Pull-up circuit is not necessary for CMOS Output type, or R3112XXXXC. Supply Current Test Circuit Detector Threshold Test Circuit ISS VDD
VDD R3112X Series GND
Nch Driver Output Current Test Circuit
+5V or VDD 470k
VIN
R3112 Series GND OUT
Pch Driver Output Current Test Circuit *Apply only to
CMOS
VDD VIN R3112 Series GND
CD Pin Threshold Test Circuit
IOUT VIN OUT VDS
VDD R3112X Series GND
CD Pin Output Current Test Circuit
IOUT OUT
VDD+VDS
+5V or VDD VDD VIN CD VDS R3112X Series GND
Output Delay Time Test Circuit
VDD ICD CD R3112X Series GND
470k OUT
VIN VDS
+VDET+2.0V or 6.0V Input Voltage VDD 0.7V GND 100% Output Voltage 50% GND VIN CD R3112X Series GND
+5V 470k
CD
OUT
Rev. 1.10
-7-
s TYPICAL CHARACTERISTICS
1) Supply Current vs. Input Voltage R3112X091X
1.5
1.5
R3112X131X
Supply Current Iss (uA)
Supply Current Iss (uA)
1.2
Topt=85C 25C
1.2
Topt=85C
0.9
0.9
25C
0.6
0.6
0.3 -40C 0 0 1 2 3 4 5 6 7 Input Voltage VIN(V)
0.3
-40C
0 0 1 2 3 4 5 6 7 Input Voltage VIN(V)
R3112X271X
1.5 2
R3112X451X
Supply Current Iss(uA)
Supply Current Iss (uA)
1.2
1.6
Topt=85C
0.9
Topt=85C 25C
1.2
25C
0.6
0.8
0.3
0.4
-40C
-40C
0 0 1 2 3 4 5 Input Voltage VIN(V) 6 7 0 0 1 2 3 4 5 Input Voltage VIN (V) 6 7
2) Detector Threshold vs. Temperature R3112X091X
0.98 Detector Threshold/Released Voltage VDETV
Detector Threshold/Released Voltage VDETV 1.42 1.40
R3112X131X
0.96 0.94 0.92
+VDET
+VDET
1.38 1.36 1.34 1.32 1.30 1.28 1.26
-VDET
0.90 0.88 0.86 -50 -25 0 25 50 75 Temperature Topt(C) 100
-VDET
-50
-25
0 25 50 75 Temperature Topt(C)
100
Rev. 1.10
-8-
R3112X271X
2.90 Detector Threshold/Released Voltage VDETV Detector Threshold/Released Voltage VDETV 4.75
R3112X451X +VDET +VDET
4.70 4.65 4.60 4.55 4.50 4.45 4.40 4.35 -50 -25 0 25 50 75 100 Temperature Topt(C)
2.85 2.80 2.75
-VDET
-VDET
2.70 2.65 2.60 -50 -25 75 (C) Temperature Topt 0 25 50 100
3) Output Voltage vs. Input Voltage R3112X091X Nch Output Type: VDD pull up
1.0 6.0
R3112X091A 5V pull up via 470k
Topt=-40C
Output Voltage V OUT(V)
0.8 Output Voltage V OUT(V)
5.0 4.0 3.0 2.0 1.0 0.0 0 0.2 0.4 0.6 0.8 1 0 0.2 Input Voltage VIN (V) 0.4 0.6 Input Voltage VIN(V) 0.8 1
25C
0.6
Topt=-40C
85C
0.4
25C 85C
0.2
0.0
R3112X131X Nch Output Type: VDD pull up
1.5
R3112X131A 5V pull up via 470k
6.0 5.0 Output Voltage VOUT(V)
Topt=-40C
1.2 Output Voltage V OUT(V)
4.0 3.0 2.0
85C 25C
0.9
0.6
Topt=-40C 25C 85C
0.3
1.0 0.0
0 0.3 0.6 0.9 Input Voltage VIN(V) 1.2 1.5
0
0
0.3
0.6 0.9 1.2 Input Voltage VIN(V)
1.5
Rev. 1.10
-9-
R3112X271X Nch Output Type: VDD pull up
3.0 2.5 Output Voltage VOUT(V) Output Voltage VOUT(V) 2.0 1.5 1.0 Topt=-40C 0.5 25C 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Input Voltage VIN(V) 85C 0.0 0.0 0.5 6.0 5.0
R3112X271A 5V pull up via 470k
Topt=-40C 4.0 3.0 2.0 1.0 25C
85C
1.0 1.5 2.0 2.5 Input Voltage VIN(V)
3.0
R3112X451X Nch Output Type: VDD pull up
5.0 4.5 Output Voltage VOUT(V) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Input Voltage VIN(V)
25C 85C Topt=-40C
R3112X451A 5V pull up via 470k
6.0 5.0 4.0 3.0 2.0 1.0 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Input Voltage VIN(V)
Output Voltage VOUT(V)
4.0
Topt=-40C 25C 85C
4) Nch Driver Output Current vs. VDS R3112X091X
1.2 1 0.8 0.6 0.4 0.2 0 0 0.2 0.4 0.6 VDS(V) 0.8 1
2.5
R3112X131X VDD=1.0V
Output Current IOUT(mA) 2
VDD=0.85V
Output Current IOUT(mA)
1.5
VDD=0.85V
1
VDD=0.7V
0.5
VDD=0.7V
0 0 0.2 0.4 0.6 0.8 1 VDS(V)
Rev. 1.10
- 10 -
R3112X271X
20
R3112X451X
20
VDD=4.0V VDD=3.5V
VDD=3.0V VDD=2.5V VDD=2.0V
12
VDD=2.0V
Output Current IOUT(mA)
Output Current IOUT(mA)
16
VDD=2.5V
16
12
8
VDD=1.5V
8
VDD=1.5V
4
4
VDD=1.0V
0 0 0.5 1 1.5 VDS (V) 2 2.5
VDD=1.0V
0 0 0.5 1 1.5 2 2.5 VDS(V) 3 3.5 4
5) Nch Driver Output Current vs. Input Voltage R3112X091X
2.0
5
R3112X131X
Output Current IOUT(mA)
1.5
Output Current IOUT(mA)
4 -40C 3 25C 2
1.0
25C
0.5
Topt=85C -40C
1 Topt=85C
0.0 0 0.2 0.4 0.6 0.8 Input Voltage VIN(V) 1
0 0 0.3 0.6 0.9 Input Voltage VIN(V) 1.2 1.5
R3112X271X
5 -40C 4 Output Current IOUT(mA) 25C 3 Output Current IOUT(mA) 5
R3112X451X
-40C 4 25C
3
Topt=85C
2
Topt=85C
2
1
1
0 0 0.5 1 1.5 2 Input Voltage VIN(V) 2.5 3
0 0 1 2 3 Input Voltage VIN(V) 4 5
Rev. 1.10
- 11 -
6) Pch Driver Output Current vs. Input Voltage R3112X091C
6 6
R3112X131C
5 Output Current IOUT(mA)
VDS=-2.1V
Output Current IOUT(mA)
5
VDS=-2.1V
4
4
-1.5V
3
-1.5V -1.0V -0.5V
3
-1.0V
2
2
-0.5V
1
1
0 0 1 2 3 4 5 Input Voltage VIN(V) 6 7
0 0 1 2 3 4 5 Input Voltage VIN(V) 6 7
R3112X271C
6 5 4 6
R3112X451C
Output Current IOUT(mA)
Output Current IOUT(mA)
VDS=-2.1V -1.5V
5
VDS=-2.1V
4 3 2
-1.5V -1.0V -0.5V
3
-1.0V
2
-0.5V
1 0 0 1 2 3 4 5 Input Voltage VIN(V) 6 7
1 0 0 1 2 3 4 5 Input Voltage VIN(V) 6 7
7) CD Pin Threshold Voltage vs. Temperature R3112X091X VDD=0.99V
0.8 CD Pin Threshold Voltage Vtcd V) 0.7 0.6 0.5 0.4 0.3 0.2 -50 -25 0 25 50 75 Temperature Topt (C) 100
CD Pin Threshold Voltage VtcdV 1.0 0.9 0.8 0.7 0.6 0.5 0.4 -50 -25
R3112X131X
VDD=1.43V
0 25 50 75 Temperature Topt (C)
100
Rev. 1.10
- 12 -
R3112X271X
1.9 CD Pin Threshold Voltage VtcdV 1.8 1.7 1.6 1.5 1.4 1.3 -50 -25
VDD=2.97V
2.9 V CD Pin Threshold Voltage Vtcd 2.8 2.7 2.6 2.5 2.4 2.3
R3112X451X
VDD=4.95V
0 25 50 75 Temperature Topt(C)
100
-50
-25
0
25
50
75
100
Temperature Topt(C)
8) CD Pin Output Current vs. Input Voltage R3112X091X VDS=0.5V
1 CD Pin Output Current Icd (mA) CD Pin Output Current Icd (mA) 1
R3112X131X
VDS=0.5V
0.8
0.8
0.6
Topt=-40C
0.6
Topt=-40C 25C
0.4
25C 85C
0.4 85C 0.2
0.2
0 0 0.2 0.4 0.6 Input Voltage VIN(V) 0.8 1
0 0 0.3 0.6 0.9 Input Voltage VIN(V) 1.2 1.5
R3112X271X
1
VDS=0.5V
1
R3112X451X
VDS=0.5V
CD Pin Output Current Icd (mA)
0.8
CD Pin Output Current Icd (mA)
Topt=-40C
0.8
Topt=-40C
0.6
25C 85C
0.6
25C 85C
0.4
0.4
0.2
0.2
0 0 0.5 1 1.5 2 Input Voltage VIN(V) 2.5 3
0 0 1 2 3 Input Voltage VIN(V) 4 5
Rev. 1.10
- 13 -
9) CD Pin Output Current vs. VDS (Topt=25C) R3112X091X
0.7
R3112X131X
1 0.9 CD Pin Output Current Icd(mA 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 0.2 0.4 0.6 VDS(V) 0.8 1
VDD=0.85V
CD Pin Output Current Icd (mA) 0.6 0.5 0.4 0.3 0.2 0.1 0 0 0.2 0.4 0.6 VDS(V) 0.8 1
VDD=1.0V
VDD=0.85V
VDD=0.7V
VDD=0.7V
R3112X271X
3 CD Pin Output Current Icd (mA) 2.5 2 1.5 1
4.5 4
R3112X451X VDD=4.0V VDD=3.5V VDD=3.0V VDD=2.5V VDD=2.0V VDD=1.5V VDD=1.0V
VDD=2.5V VDD=2.0V VDD=1.5V VDD=1.0V
CD Pin Output Current Icd (mA)
3.5 3
2.5 2
1.5 1
0.5 0 0 0.5 1 1.5 VDS(V) 2 2.5
0.5 0 0 0.5 1 1.5 2 2.5 VDS(V) 3 3.5 4
10) Output Delay Time vs. External Capacitance R3112X091X
1000 Output Delay Time txms 100 10 1 0.1
(Topt=25C) R3112X131X
1000
Output Delay Time tDms
tD
100
tD
10
1
tpHL
0.1
tpHL
0.01 0.0001 0.001 0.01 0.1 External Capacitance Cd (uF
0.01 0.0001
0.001 0.01 External Capacitance Cd(uF
0.1
Rev. 1.10
- 14 -
R3112X271X
1000
R3112X451X
1000
Output Delay Time txms
tD
10
ms Output Delay Time tx
100
100
tD
10
tpHL
1
1
tpHL
0.1
0.1
0.01 0.0001
0.001 0.01 External Capacitance Cd(uF
0.1
0.01 0.0001
0.001 0.01 External Capacitance Cd(uF
0.1
11) Delay Circuit Resistance vs. Temperature R3112XXX1X
13 MOhm Delay Circuit Resistance Rd 12 11 10 9 8 7 6 5 4 3 -50 -25 0 25 50 Temperature Topt 75 100
Rev. 1.10
- 15 -
s TECHNICAL NOTES
VDD R
VDD R1 V DD
VDD R1 V DD R311 2x OUT Series GND OUT R2
R3112x Series GND
R2 OUT
R3112X Series GND
Figure A Figure B Figure C When R3112XXX1A (Nch Open Drain Output Type) is used in Figure A or Figure B, if Impedance of Voltage Supply pIn, VDD and VDD of this IC is large, detector threshold level would shift by voltage dropdown caused by the consumption current of the IC itself. Released voltage may also shift and delay time for start-up might be generated by this usage. When R3112XXX1C (CMOS Output Type) is used in Figure A or Figure B, Output level could be unstable by throughout current which is generated at detector threshold level or at released voltage level, therefore, do not use R3112XXX1C with the connection in Figure A or Figure B. The connection in Figure C may cause the oscillation in both R3112XXX1C (CMOS Output) and R3112XXX1A (Nch Open Drain Output), therefore do not use R3112XXX1X Series with the connection in Figure C.
Rev. 1.10
- 16 -

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