Rev. 1.10

- 2 -

s

s

s

s OPERATION

OUT

Vref

GND

+

-

Pch

Nch

Schmitt Trigger

Comparator

Ra

Rb

Rc

Tr.1

Tr.2

Output Capacitor

Current Source

Fig. 1 Block Diagram with an external capacitor

Output Voltage

(OUT)

Supply Voltage

(VDD)

HYSTERESIS RANGE

A

B

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

Ra+Rb+Rc

ΙΙ

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

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

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