2001. Apr. 4 LOW VOLTAGE DETECTOR WITH OUTPUT DELAY R3112xxx1A/C Series 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. FEATURES Built-in Output Delay Circuit* * * * * * * * * * *TYP. 100ms with an external capacitor: 0.022F Ultra-low Supply Current* * * * * * * * * * *TYP. 1.0A (VDD=3.5V) Wide Range of Operating Voltage * * * * * *0.76.0V(Topt=25C) Detector Threshold * * * * * * * * *Stepwise setting with a step of 0.1V in the range of 0.9V to 5.0V is possible. High Accuracy Detector Threshold * * * * * * * 2.0% Low Temperature-Drift Coefficient of Detector Threshold* * * * * * * * * TYP. 100ppm/C Two Output Types* * * * * * * * * * * * * * * * * * * Nch Open Drain and CMOS Two Types of Packages * * * * * * * * * * SOT-23-5 (Mini-mold), SC-82AB APPLICATIONS * CPU and Logic Circuit Reset * Battery Checker * Window Comparator * Wave Shaping Circuit * Battery Back-up Circuit * Power Failure Detector BLOCK DIAGRAMS R3112XXX1A VDD RD R3112XXX1C OUT VDD RD + OUT + -- Vref Vref GND CD Rev. 1.10 GND CD -1- OPERATION Ra Current Source VDD Comparator - Schmitt Trigger RD + Rb Pch OUT Tr.2 Tr.1 Vref Nch Rc GND Output Capacitor CD Fig. 1 Block Diagram with an external capacitor Released Voltage +VDET 1 2 3 4 B 5 HYSTERESIS RANGE Detector Threshold -VDET A Supply Voltage VDDL (VDD) Minimum Operating Voltage GND Operation Status 1 2 3 4 5 Comparator(-) Pin Input Voltage Comparator Output L H Indefinite H L Tr.1, 2 OFF ON Indefinite ON OFF Nch OFF ON Indefinite ON OFF Pch ON OFF Indefinite OFF ON Output Tr. Output Voltage (OUT) Delay Time GND 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- Operation of Output Delay Released Voltage (+VDET) Supply Voltage CD Pin Threshold Voltage (VTCD) Capacitor Voltage 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. 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- 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 c d 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) PIN CONFIGURATION SOT-23-5 5 4 MARK SIDE 1 2 3 SC-82AB 4 3 MARK SIDE 1 2 PIN DESCRIPTION Pin No. SC-82AB SOT-23-5 Symbol Description Pin No. Symbol Description 1 VDD Voltage Supply Pin VDD Output Pin(Output "L" at detector threshold, Output "H" at released voltage) Voltage Supply Pin 2 GND Ground Pin 3 GND Ground Pin 3 CD 4 NC No Connection 4 OUT 5 CD Pin for External Capacitor (for setting output delay) 1 OUT 2 Rev. 1.10 -4- Pin for External Capacitor (for setting output delay) Output Pin(Output "L" at detector threshold, Output "H" at released voltage) ABSOLUTE 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. R3112x091A/C Symbol -VDET VHYS ISS VDDH VDDL IOUT VTCD ICD RD -VDET/T Rev. 1.10 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 VDD=0.80V 1.90V Topt=25C -40C Topt 85C Nch VDS=0.05V,VDD=0.70V VDS=0.50V,VDD=0.85V 0.6 0.5 Unit V V 2.0 2.0 6.0 A 0.70 0.80 V V A 10 0.05 120 0.9 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 -5- MAX. 0.918 0.063 mA mA 0.693 V A 13.00 M ppm/C R3112x271A/C Symbol Item -VDET Detector Threshold VHYS Detector Threshold Hysteresis ISS Supply Current VDDH VDDL Maximum Operating Voltage Minimum Operating Voltage*Note1 IOUT Output Current (Driver Output Pin) VTCD ICD CD pin Threshold Voltage CD pin Output Current RD -VDET/T Output Delay Resistance Detector Threshold Temperature Coefficient Conditions MIN. 2.646 0.081 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 TYP. 2.700 1.0 0.5 10 1.0 120 3.0 1.0 0.891 2.0 200 3.25 3.5 1.485 70 500 6.50 100 -40C Topt85C R3112x501A/C Symbol -VDET VHYS ISS Item Detector Threshold Detector Threshold Hysteresis Supply Current VDDH VDDL Maximum Operating Voltage Minimum Operating Voltage*Note1 IOUT Output Current (Driver Output Pin) VTCD ICD CD pin Threshold Voltage CD pin Output Current RD Output Delay Resistance Detector Threshold Temperature Coefficient Conditions VDS=0.5V, VDD=1.5V -VDET/T -40CTopt85C A mA mA 2.079 V A 13.00 M ppm/C Topt=25C MAX. Unit 5.100 V 0.350 V 2.5 A 3.0 6.0 V 0.7 V 0.8 MIN. 4.900 0.150 TYP. 5.000 0.250 1.5 0.6 10 1.0 120 3.0 1.5 1.650 2.0 4.5 2.750 70 3.850 V A 200 3.25 500 6.50 100 13.00 M ppm/C 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 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 *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- 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 R3112 VIN R3112X +5V or VDD 470k Series Series OUT GND GND Nch Driver Output Current Test Circuit Pch Driver Output Current Test Circuit *Apply only to CMOS VDD R3112 Series VIN VDD IOUT VIN OUT IOUT R3112X Series VDS OUT GND GND CD Pin Threshold Test Circuit CD Pin Output Current Test Circuit VDD +5V or VDD ICD VDD VIN CD VDS VDD+VDS 470k R3112X Series VIN CD VDS OUT R3112X Series GND GND Output Delay Time Test Circuit +VDET+2.0V or 6.0V Input Voltage +5V VDD VIN 0.7V GND GND 50% GND Rev. 1.10 R3112X Series CD 100% Output Voltage CD -7- 470k OUT TYPICAL CHARACTERISTICS 1) Supply Current vs. Input Voltage R3112X091X R3112X131X 1.5 1.2 Topt=85C Supply Current Iss (uA) Supply Current Iss (uA) 1.5 25C 0.9 0.6 1.2 Topt=85C 0.9 25C 0.6 0.3 0.3 -40C -40C 0 0 0 1 2 3 4 5 6 0 7 1 2 4 5 6 7 Input Voltage VIN(V) Input Voltage VIN(V) R3112X271X R3112X451X 2 1.2 1.6 0.9 Supply Current Iss (uA) 1.5 Supply Current Iss(uA) 3 Topt=85C 25C 0.6 Topt=85C 1.2 25C 0.8 0.4 0.3 -40C -40C 0 0 0 1 2 3 4 5 Input Voltage VIN(V) 6 0 7 1 2 3 4 5 Input Voltage VIN (V) 2) Detector Threshold vs. Temperature R3112X091X 1.42 0.96 Detector Threshold/Released Voltage VDETV Detector Threshold/Released Voltage VDETV 7 R3112X131X 0.98 +VDET 0.94 0.92 -VDET 0.90 0.88 0.86 1.40 +VDET 1.38 1.36 1.34 -VDET 1.32 1.30 1.28 1.26 -50 Rev. 1.10 6 -25 0 25 50 75 Temperature Topt(C) -50 100 -8- -25 0 25 50 75 Temperature Topt(C) 100 R3112X271X R3112X451X 2.90 4.75 Detector Threshold/Released Voltage VDETV Detector Threshold/Released Voltage VDETV +VDET 2.85 2.80 2.75 -VDET 2.70 2.65 2.60 -50 -25 0 25 50 75 (C) Temperature Topt +VDET 4.70 4.65 4.60 4.55 -VDET 4.50 4.45 4.40 4.35 -50 100 -25 0 25 50 75 100 Temperature Topt(C) 3) Output Voltage vs. Input Voltage R3112X091X Nch Output Type: VDD pull up R3112X091A 5V pull up via 470k 6.0 1.0 Topt=-40C 5.0 0.6 Output Voltage V OUT(V) Output Voltage V OUT(V) 0.8 Topt=-40C 0.4 25C 0.2 85C 25C 4.0 3.0 85C 2.0 1.0 0.0 0.0 0 0.2 0.4 0.6 0.8 1 0 0.2 Input Voltage VIN (V) R3112X131X Nch Output Type: VDD pull up 0.4 0.6 Input Voltage VIN(V) 0.8 1 R3112X131A 5V pull up via 470k 1.5 6.0 5.0 Output Voltage VOUT(V) Output Voltage V OUT (V) 1.2 0.9 Topt=-40C 0.6 25C 0.3 Topt=-40C 4.0 3.0 25C 2.0 85C 1.0 85C 0.0 0 0 Rev. 1.10 0.3 0.6 0.9 Input Voltage VIN(V) 1.2 1.5 -9- 0 0.3 0.6 0.9 1.2 Input Voltage VIN(V) 1.5 R3112X271A 5V pull up via 470k 3.0 6.0 2.5 5.0 Output Voltage VOUT(V) Output Voltage VOUT(V) R3112X271X Nch Output Type: VDD pull up 2.0 1.5 1.0 Topt=-40C 0.5 Topt=-40C 4.0 25C 3.0 85C 2.0 1.0 25C 85C 0.0 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 2.5 Input Voltage VIN(V) Input Voltage VIN(V) R3112X451X Nch Output Type: VDD pull up 3.0 R3112X451A 5V pull up via 470k 6.0 5.0 4.0 Output Voltage VOUT(V) Output Voltage VOUT(V) 4.5 3.5 3.0 2.5 2.0 1.5 Topt=-40C 1.0 25C 0.5 5.0 Topt=-40C 4.0 25C 85C 3.0 2.0 1.0 85C 0.0 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 V IN(V) 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) 4) Nch Driver Output Current vs. VDS R3112X091X R3112X131X 2.5 VDD=1.0V VDD=0.85V 1 Output Current IOUT(mA) Output Current IOUT(mA) 1.2 0.8 0.6 VDD=0.7V 0.4 0.2 0 2 1.5 VDD=0.85V 1 0.5 VDD=0.7V 0 0 Rev. 1.10 0.2 0.4 0.6 VDS(V) 0.8 1 0 0.2 0.4 0.6 VDS(V) - 10 - 0.8 1 R3112X271X R3112X451X 20 VDD=2.5V 16 VDD=2.0V 12 8 VDD=1.5V 4 Output Current IOUT(mA) Output Current IOUT(mA) 20 VDD=4.0V VDD=2.5V VDD=3.5V 16 VDD=2.0V 12 8 VDD=1.5V 4 VDD=1.0V VDD=1.0V 0 0 0 0.5 1 1.5 VDS (V) 2 2.5 0 0.5 1 5) Nch Driver Output Current vs. Input Voltage R3112X091X 1.5 2 2.5 VDS(V) 3.5 4 Output Current IOUT(mA) 5 1.5 1.0 25C 0.5 Topt=85C 4 -40C 3 25C 2 1 -40C Topt=85C 0.0 0 0.2 0.4 0.6 0.8 Input Voltage VIN(V) 0 1 0 0.3 0.6 0.9 Input Voltage VIN(V) R3112X271X 1.2 1.5 R3112X451X 5 5 -40C -40C 4 Output Current IOUT(mA) 4 Output Current IOUT(mA) 3 R3112X131X 2.0 Output Current IOUT(mA) VDD=3.0V 25C 3 Topt=85C 2 25C 3 Topt=85C 2 1 1 0 0 0 Rev. 1.10 0.5 1 1.5 2 Input Voltage VIN(V) 2.5 3 - 11 - 0 1 2 3 Input Voltage VIN(V) 4 5 6) Pch Driver Output Current vs. Input Voltage R3112X091C R3112X131C 6 6 5 VDS=-2.1V Output Current IOUT(mA) Output Current IOUT(mA) 5 4 -1.5V 3 -1.0V 2 -0.5V 1 VDS=-2.1V 4 -1.5V 3 -1.0V 2 -0.5V 1 0 0 0 1 2 3 4 5 Input Voltage VIN(V) 6 7 0 1 2 R3112X271C 7 6 5 VDS=-2.1V Output Current IOUT(mA) Output Current IOUT(mA) 6 R3112X451C 6 4 -1.5V 3 -1.0V 2 -0.5V 1 5 VDS=-2.1V 4 -1.5V 3 -1.0V 2 -0.5V 1 0 0 0 1 2 3 4 5 Input Voltage VIN(V) 6 7 0 1 2 7) CD Pin Threshold Voltage vs. Temperature R3112X091X VDD=0.99V 3 4 5 Input Voltage VIN(V) R3112X131X 6 7 VDD=1.43V 1.0 CD Pin Threshold Voltage VtcdV 0.8 CD Pin Threshold Voltage Vtcd V) 3 4 5 Input Voltage VIN(V) 0.7 0.6 0.5 0.4 0.3 0.2 0.9 0.8 0.7 0.6 0.5 0.4 -50 Rev. 1.10 -25 0 25 50 75 Temperature Topt (C) 100 -50 - 12 - -25 0 25 50 75 Temperature Topt (C) 100 R3112X271X VDD=2.97V R3112X451X 2.9 CD Pin Threshold Voltage VtcdV CD Pin Threshold Voltage VtcdV 1.9 1.8 1.7 1.6 1.5 1.4 2.8 2.7 2.6 2.5 2.4 2.3 1.3 -50 -25 0 25 50 75 Temperature Topt(C) -50 100 -25 25 50 75 R3112X131X 100 VDS=0.5V 1 CD Pin Output Current Icd (mA) 1 CD Pin Output Current Icd (mA) 0 Temperature Topt(C) 8) CD Pin Output Current vs. Input Voltage R3112X091X VDS=0.5V 0.8 0.6 Topt=-40C 0.4 25C 85C 0.2 0 0 0.2 0.4 0.6 Input Voltage VIN(V) 0.8 R3112X271X 0.8 Topt=-40C 0.6 25C 0.4 85C 0.2 0 1 0 0.3 VDS=0.5V 0.6 0.9 Input Voltage VIN(V) R3112X451X 1 1.2 1.5 VDS=0.5V 1 Topt=-40C 0.8 0.6 CD Pin Output Current Icd (mA) CD Pin Output Current Icd (mA) VDD=4.95V 25C 85C 0.4 0.2 0 Topt=-40C 0.8 0.6 25C 85C 0.4 0.2 0 0 Rev. 1.10 0.5 1 1.5 2 Input Voltage VIN(V) 2.5 3 - 13 - 0 1 2 3 Input Voltage VIN(V) 4 5 9) CD Pin Output Current vs. VDS (Topt=25C) R3112X091X R3112X131X 0.7 1 0.9 CD Pin Output Current Icd(mA CD Pin Output Current Icd (mA) VDD=0.85V 0.6 0.5 0.4 0.3 VDD=0.7V 0.2 0.7 0.6 0.5 0.3 0 0 0.4 0.6 VDS(V) 0.8 VDD=0.7V 0.2 0.1 0.2 VDD=0.85V 0.4 0.1 0 VDD=1.0V 0.8 0 1 0.2 R3112X271X 0.8 4.5 CD Pin Output Current Icd (mA) VDD=2.5V 2.5 1 R3112X451X 3 CD Pin Output Current Icd (mA) 0.4 0.6 V DS(V) VDD=4.0V 4 VDD=3.5V 3.5 VDD=2.0V 2 VDD=3.0V VDD=2.5V 3 2.5 1.5 VDD=1.5V 1 2 VDD=2.0V 1.5 VDD=1.0V 0.5 VDD=1.5V 1 VDD=1.0V 0.5 0 0 0 0.5 1 1.5 VDS(V) 2 2.5 10) Output Delay Time vs. External Capacitance R3112X091X 0 2 2.5 VDS(V) 3 3.5 4 R3112X131X tpHL Output Delay Time tDms Output Delay Time txms tD 1 0.01 0.0001 0.001 0.01 0.1 External Capacitance Cd (uF Rev. 1.10 1.5 1000 10 0.1 1 (Topt=25C) 1000 100 0.5 100 tD 10 1 0.01 0.0001 - 14 - tpHL 0.1 0.001 0.01 External Capacitance Cd(uF 0.1 R3112X271X R3112X451X 1000 100 100 Output Delay Time txms Output Delay Time txms 1000 tD 10 tpHL 1 0.1 0.01 0.0001 0.001 0.01 External Capacitance Cd(uF 0.1 11) Delay Circuit Resistance vs. Temperature R3112XXX1X 13 Delay Circuit Resistance RdMOhm 12 11 10 9 8 7 6 5 4 3 -50 Rev. 1.10 -25 0 25 50 Temperature Topt 75 100 - 15 - tD 10 1 tpHL 0.1 0.01 0.0001 0.001 0.01 External Capacitance Cd(uF 0.1 TECHNICAL NOTES VDD VDD VDD R1 R R1 V DD R3112x Series GND R2 OUT V DD R3112X Series R2 R311 2x OUT GND Series OUT 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 -