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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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