R3111x

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 R3111E (TO-92) is the discontinued product as of April, 2017.

TECHNICAL NOTES

When connecting resistors to the device’s input pin

When connecting a resistor (R1) to an input of this device, the input voltage decreases by [Device’s

Consumption Current] x [Resistance Value] only. And, the cross conduction current*1, which occurs when

changing from the detecting state to the release state, is decreased the input voltage by [Cross Conduction

Current] x [Resistance Value] only. And then, this device will enter the re-detecting state if the input voltage

reduction is larger than the difference between the detector voltage and the released voltage.

When the input resistance value is large and the VDD is gone up at mildly in the vicinity of the released voltage,

repeating the above operation may result in the occurrence of output.

As shown in Figure A/B, set R1 to become 100 kΩ or less as a guide, and connect CIN of 0.1 μF and more to

between the input pin and GND. Besides, make evaluations including temperature properties under the actual

usage condition, with using the evaluation board like this way. As a result, make sure that the cross conduction

current has no problem.

VDD

R1

GND

OUT pin

CIN*2

Figure A

Voltage

Detector

VDD

R1

GND

OUT pin

CIN*2

Figure B

Voltage

Detector

R2

*1 In the CMOS output type, a charging current for OUT pin is included.

*2 Note the bias dependence of capacitors.