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R3112N241C Datasheet(PDF) 10 Page - RICOH electronics devices division |
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R3112N241C Datasheet(HTML) 10 Page - RICOH electronics devices division |
10 / 30 page R3112x 10 OPERATION VDD Pch Rc Tr.1 Tr.2 Rb Ra Nch RD OUT CD GND + - Vref Schmitt Trigger Comparator Current Source Output Capacitor Fig. 1 Block Diagram with an external capacitor HYSTERESIS RANGE 1 GND GND Delay Time A B Output Voltage(OUT) Supply Voltage(VDD) VDDL -VDET +VDET Minimum Operating Voltge Detector Threshold Released Voltage 23 4 5 Operation Status Compartor(-) Pin Input Voltage Compartor Output Tr.1, 2 1 I I VDD L OFF Rb+Rc Ra+Rb+Rc OFF ON Output Tr. Nch Pch 2 II H ON ON OFF 4 II H ON ON OFF 5 I L OFF OFF ON 3 II Indefinite Indefinite Indefinite Indefinite II VDD Rb 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), 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. |
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