R3112Q15A-TR 데이터 시트보기 (PDF) - RICOH Co.,Ltd.

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R3112Q15A-TR

LOW VOLTAGE DETECTOR WITH OUTPUT DELAY

RICOH Co.,Ltd. 

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 6.5MΩ(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-

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