R3130N16AA-TR Ver la hoja de datos (PDF) - RICOH Co.,Ltd.

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Fabricante

R3130N16AA-TR

Low Voltage Detector with built-in Delay Circuit

RICOH Co.,Ltd. 

R3130N×××A/C, R3131N×××A/C

OPERATION

• Operation of R3130N Series

Ra

Vref Rb

+

Delay

-

Circuit

Comparator

Supply

Voltage

(VDD)

1

2

A

Block Diagram

3

4

B

VDD • CMOS Output Type

OUT pin is connected to the drain

Pch

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

• Nch Open Drain Output Type

OUT

OUT pin is connected to the drain

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

pulled up to VDD or an external voltage

Nch

level.)

GND

5

Detector Threshold(VDET)

=Released Voltage

Minimum Operating

Voltage(VDDL)

GND

Output

Voltage

(OUT)

Tdelay

GND

Operating Diagram

In the above diagram,

! Output Voltage becomes equal to supply voltage (Nch Open Drain Output Type; equal to pull-up Voltage).

" When Supply Voltage is down to the detector threshold level (Point A), Vref ≥ VDD× Rb/(Ra+Rb) is true. Then,

Output of the comparator is reversed, thus output voltage becomes equal to GND level.

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

put is also indefinite.

$ Output Voltage is equal to GND level.

% When Supply voltage is higher than Released Voltage (Point B), Vref ≤ VDD× Rb/(Ra+Rb) is true. Then Output of

the comparator is reversed, thus Output Voltage becomes equal to Supply Voltage (Nch Open Drain Output Type;

equal to pull-up voltage).

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

18

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