R3117K273C-TR

R3117xxx3/4 SERIES LOW VOLTAGE DETECTOR with SENSE pin NO.EA-261-160229 Notice R3117xxx3A/C and R3117Qxx4A/C Series may cause the malfunction (miss detection), in the case of its VDD pin voltage changes very rapidly. Please check the details in the page 11. 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. • 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>Ra. Refer to the electrical characteristics table to see the RSENSE value. VDD Vs VDD Ra -VDET Rb SENSE R3117x Series GND Fig.3 12 Vs Ra Ia -VDET DOUT Rb Ib R3117x Series SENSE ISENSE RSENSE GND Fig.4 R3117xxx3/4 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.5. VB R1 Vs Ra -VDET Rb VDD SENSE R3117x Series R2 DOUT GND Fig.5 13 R3117xxx3/4 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. 14 R3117xxx3/4 TEST CIRCUITS ISS VIN SENSE 5V or VDD VDD VDD R3117x Series VIN SENSE R3117x Series 470kΩ DOUT VOUT GND GND Supply Current Test Circuit Detector Threshold Test Circuit (Pull-up circuit is not necessary for CMOS Output type.) VDD VIN SENSE R3117x Series IOUT DOUT GND Nch Driver Output Current Test Circuit VDS VDD VIN VDS SENSE R3117x Series IOUT DOUT VDD−VDS GND Pch Driver Output Current Test Circuit ∗Apply to CMOS Output type only 15 R3117xxx3/4 TYPICAL CHARACTERISTICS 1) Supply Current vs. Supply Voltage R3117xxxxA/C (at released) R3117xxxxA/C (at detect) 2) Detector Threshold vs. Temperature R3117x07xA/C R3117x50xA/C 16 R3117x30xA/C R3117xxx3/4 3) Detector Threshold vs. Supply Voltage R3117x07xA/C R3117x30xA/C R3117x50xA/C 4) Hysteresis vs. Supply Voltage R3117x07xA/C R3117x30xA/C 17 R3117xxx3/4 R3117x50xA/C 5) Output Voltage vs. SENSE pin Input Voltage (Nch Open Drain Output type is pulled up to VDD.) R3117x07xA/C R3117x50xA/C 18 R3117x30xA/C R3117xxx3/4 6) Nch Driver Output Current vs. Supply Voltage R3117xxxxA/C 8) Pch Driver Output Current vs. Supply Voltage R3117xxxxC 7) Nch Driver Output Current vs. VDS R3117xxxxA/C 9) Pch Driver Output Current vs. VDS R3117xxxxC 19 R3117xxx3/4 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 Vs CPU R3117xxxxA Series DOUT SENSE RESET GND GND (2) Input Voltage to R3117xxxxA is unequal to Input Voltage to CPU VDD1 470kΩ R VDD Vs R3117xxxxA Series DOUT SENSE GND • VDD2 VDD CPU RESET GND R3117xxxxC CPU Reset Circuit (CMOS Output) VDD VDD Vs R3117xxxxC Series DOUT SENSE GND 20 VDD CPU RESET GND R3117xxx3/4 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 CIN 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 CIN *2 Voltage Detector VDD OUT pin R2 CIN *2 GND Figure A Voltage Detector OUT pin GND Figure B *1 In the CMOS output type, a charging current for OUT pin is included. *2 Note the bias dependence of capacitors. 21 1. The products and the product specifications described in this document are subject to change or discontinuation of production without notice for reasons such as improvement. Therefore, before deciding to use the products, please refer to Ricoh sales representatives for the latest information thereon. 2. The materials in this document may not be copied or otherwise reproduced in whole or in part without prior written consent of Ricoh. 3. Please be sure to take any necessary formalities under relevant laws or regulations before exporting or otherwise taking out of your country the products or the technical information described herein. 4. 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