RH5VT09C datasheet(18/31 Pages) RICOH

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OPERATION

FIG. 1 Block Diagram

Operation Diagram

Step 1. Output Voltage is equal to Power Source Voltage (VDD).

Step 2. When Input Voltage to Comparator reaches the state of Vref

≥VDD·(Rb+Rc)/(Ra+Rb+Rc)at Point A (Detected Voltage –VDET), the output of Com-

parator is reserved, so that Output Voltage becomes GND.

Step 3. In the case of CMOS Output, Output Voltage becomes unstable when Supply Voltage (VDD) is smaller than Minimum Operating Voltage. In the

case of Nch Open Drain Output, a pulled-up voltage is output.

Step 4. Output Voltage becomes equal to GND.

Step 5. When Input Voltage to Comparator reaches the state of Vref

≤VDD· (Rb)/(Ra+ Rb) at Point B (Released Voltage +VDET), the output of Comparator is reversed,

so that Output Voltage becomes equal to Supply Voltage (VDD).

FIG. 2 Operation Diagram

Step

Step 1

Step 2

Step 3

Step 4

Step 5

Comparator(+) Pin

Input Voltage

Comparator Output

Indefinite

Tr. 1

OFF

Indefinite

OFF

Output Tr.

Pch

OFF

Indefinite

OFF

Nch

OFF

Indefinite

OFF

Rb + Rc

Ra + Rb + Rc

·VDD

II.

Ra + Rb

·VDD

GND

OUT

VDD

Tr.1

Pch

Nch

–

Detector Threshold Hysteresis

tPLH

• In R

×5VT××A, Nch Tr. drain is

connected to OUT pin.

• In R

×5VT××C, Nch Tr. drain

and Pch Tr. drain are connected

to OUT pin.

Released Volage +VDET

Supply Volage

Detected Volage –VDET

(VDD)

Minimum Operating Volage

GND

Output Volage

(OUT)

GND

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