R3130N×××A/C, R3131N×××A/C

19

• Operation of R3131N Series

OUT

Pch

Ra

Rb

Nch

GND

Comparator

Vref

-

+

Delay

Circuit

Block Diagram

• CMOS Output Type

OUT pin is connected to the drain

of Nch Tr. and Pch Tr. in this IC.

• Nch Open Drain Output Type: I

OUT pin is connected to the drain

of Nch Tr. in this IC. (OUT pin should be

level.)

Minimum Operating

Tdelay

GND

GND

B

A

1

2

3

4

5

Supply

Voltage

Output

Voltage

=Released Voltage

Operation Diagram

In the above diagram,

!

Output Voltage becomes equal to GND level.

"

Output of the comparator is reversed, thus output voltage becomes equal to Supply Voltage (Nch Open Drain

Output type; equal to pull-up Voltage).

#

When Supply Voltage is lower than minimum operating voltage, Output of transistor is indefinite, therefore Out-

put is also indefinite.(Nch Open Drain Output type; Output voltage level is equal to pull-up voltage.)

$

Output Voltage is equal to Supply Voltage. (Nch Open Drain Output type; equal to pull-up Voltage.)

%

the comparator is reversed, thus Output Voltage becomes equal to GND level after the output delay time.

* There is no hysteresis range between Detector threshold and Released Voltage.