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R3112X091A Datasheet(PDF) 2 Page - RICOH electronics devices division |
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R3112X091A Datasheet(HTML) 2 Page - RICOH electronics devices division |
2 / 16 page Rev. 1.10 - 2 - s s s s OPERATION OUT Vref VDD GND CD + - Pch Nch Schmitt Trigger Comparator Ra Rb Rc Tr.1 Tr.2 RD Output Capacitor Current Source Fig. 1 Block Diagram with an external capacitor Output Voltage (OUT) Supply Voltage (VDD) HYSTERESIS RANGE A B Released Voltage+VDET Detector Threshold-VDET Minimum Operating Voltage VDDL GND GND Delay Time 1 234 5 Operation Status 12 3 4 5 Comparator(-) Pin Input Voltage ΙΙΙ ΙΙ ΙΙ Ι Comparator Output LH Indefinite HL Tr.1, 2 OFF ON Indefinite ON OFF Nch OFF ON Indefinite ON OFF Output Tr. Pch ON OFF Indefinite OFF ON Ι Rb+Rc ×VDD Ra+Rb+Rc ΙΙ ×VDD 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), Vref ≥VDD×(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), Vref ≤VDD×Rb/(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. Rb Ra+Rb |
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