R3112X Ver la hoja de datos (PDF) - RICOH Co.,Ltd.

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R3112X

LOW VOLTAGE DETECTOR WITH OUTPUT DELAY

RICOH Co.,Ltd. 

• Operation of Output Delay

Supply Voltage

Released Voltage (+VDET)

R3112x

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.

• 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)

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