RTC-4574SAA - EPSON ELECTRONICS AMERICA

R3117xxx1/2 SERIES

LOW VOLTAGE DETECTOR with SENSE pin

NO.EA-186-160226

1

Notice

If the SENSE pin voltage of R3117xxx1A/C and R3117Qxx2A/C make the gradual curve by raising 0.5V/ms

or less, it may cause noise when the output voltage is switched from low to high. Please use R3117xxx3A/C

and R3117Qxx4A/C Series for new designs instead of these products to avoid the above problem.

OUTLINE

The R3117x series are CMOS-based voltage detector ICs with high detector threshold accuracy and ultra-low

supply current, which can be operated at an extremely low voltage and is used for system reset as an example.

Each of these ICs consists of a voltage reference unit, a comparator, resistors for detector threshold setting,

an output driver and a hysteresis circuit. The detector threshold is fixed with high accuracy internally and does

not require any adjustment.

The tolerance of the detector threshold is ±15mV (-VDET

<

=

1.5V) or ±1.0% (1.5V< -VDET). Since the sense pin

is separated from the VDD pin of the IC, therefore, even if the sense pin voltage becomes to 0V, the output voltage

keeps its "L" level.

Two output types, Nch open drain type and CMOS type are available.

Three types of packages, SOT-23-5, SC-88A, and DFN(PLP)1010-4 are available.

FEATURES∗

• Supply Current ...................................................................... Typ. 0.29µA (VDD=6.0V)

Consumption current through SENSE pin is not included.

• Operating Voltage Range ...................................................... 1.0V to 6.0V (-40°C

<

=

Topt

<

=

105°C)

• Detector Threshold Range .................................................... 0.7V to 5.0V (0.1V steps)

(For other voltages, please refer to MARK INFORMATIONS.)

• Accuracy Detector Threshold ................................................ ±1.0% (-VDET

>

=

1.6V), ±15mV (-VDET<1.6V)

• Temperature-Drift Coefficient of Detector Threshold ............ Typ. ±30ppm/°C

• Output Types ......................................................................... Nch Open Drain and CMOS

• Packages .............................................................................. DFN(PLP)1010-4, SC-88A, SOT-23-5

∗ Topt=25°C, unless otherwise noted.

APPLICATIONS

• CPU and Logic Circuit Reset

• Battery Checker

• Window Comparator

• Wave Shaping Circuit

• Battery Back-up Circuit

• Power Failure Detector

R3117xxx1/2

2

BLOCK DIAGRAMS

Nch Open Drain Output (R3117xxxxA) CMOS Output (R3117xxxxC)

D

OUT

V

DD

Vref

GND

SENSE

DOUT

VDD

Vref

GND

SENSE

SELECTION GUIDE

The package type, the detector threshold, the output type and the taping type for the ICs can be selected at

the users’ request.

Product Name

Package

Quantity per Reel

Pb Free

Halogen Free

R3117Kxx1

∗

-TR

DFN(PLP)1010-4 10,000 pcs Yes Yes

R3117Qxx2

∗

-TR-FE

SC-88A 3,000 pcs Yes Yes

R3117Nxx1

∗

-TR-FE

SOT-23-5 3,000 pcs Yes Yes

xx : The detector threshold can be designated in the range from 0.7V(07) to 5.0V(50) in 0.1V steps.

(For other voltages, please refer to MARK INFORMATIONS.)

∗ : Designation of Output Type

(A) Nch Open Drain

(C) CMOS

R3117xxx1/2

3

PIN CONFIGURATIONS

•

DFN

（

PLP

）

1010-4*1

•

SC-88A

•

SOT-23-5

Top View

2

1

3

4

Bottom View

1

2

4

3

5

4

1

3

2

(mark side)

1

4

5

2

3

(mark side)

PIN DESCRIPTIONS

• DFN(PLP)1010-4*1

Pin No.

Symbol

Description

1

D

OUT

Output Pin

("L" at detection)

2

SENSE

Voltage Detector Voltage Sense Pin

3

GND

Ground Pin

4

V

DD

Input Pin

∗1) Tab is GND level. (They are connected to the reverse side of this IC.)

The tab is better to be connected to the GND, but leaving it open is also acceptable.

• SC-88A

Pin No.

Symbol

Description

1

V

DD

Input Pin

2

NC

No Connection*

2

3

GND

Ground Pin

4

SENSE

Voltage Detector Voltage Sense Pin

5

D

OUT

Output Pin

("L" at detection)

∗2) In terms of NC pin of SC-88A, connect it to the GND or use it as open.

• SOT-23-5

Pin No.

Symbol

Description

1

D

OUT

Output Pin

("L" at detection)

2

V

DD

Input Pin

3

GND

Ground Pin

4

NC

No Connection

5

SENSE

Voltage Detector Voltage Sense Pin

R3117xxx1/2

4

ABSOLUTE MAXIMUM RATINGS

Symbol

Item

Rating

Unit

V

DD

Supply Voltage

7.0

V

SENSE

SENSE Pin Voltage

7.0

V

VOUT

Output Voltage (Nch Open Drain Output)

V

SS

−0.3 to 7.0

V

Output Voltage (CMOS Output)

V

SS−

0.3 to V

DD+

0.3

I

OUT

Output Current

20

mA

PD

Power Dissipation (DFN(PLP)1010-4)*

400

mW

Power Dissipation (SC-88A)*

380

Power Dissipation (SOT-23-5)*

420

Topt

Operating Temperature Range

−40 to 105

°C

Tstg

Storage Temperature Range

−

55 to 125

°

C

* ) For Power Dissipation, please refer to PACKAGE INFORMATION.

ABSOLUTE MAXIMUM RATINGS

Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the

permanent damages and may degrade the life time and safety for both device and system using the device

in the field. The functional operation at or over these absolute maximum ratings is not assured.

ELECTRICAL CHARACTERISTICS

• R3117xxxxA/C values indicate −40°C

<

=

Topt

<

=

105°C, unless otherwise noted. Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

-VDET Detector Threshold

(Topt=25°C)

0.7V

<

=

-VDET<1.6V

1.0V

<

=

V

DD

<

=

5.25V

-V

DET

-15

-V

DET

+15

mV

5.25V < V

DD

<

=

6.0V

-V

DET

-11

-V

DET

+24

1.6V

<

=

-VDET

<

=

5.0V

1.0V

<

=

VDD

<

=

5.25V

-V

DET

×0.99

-V

DET

×1.01 V

5.25V < VDD

<

=

6.0V

-V

DET

×

0.9925

-V

DET

×

1.016

-VDET Detector Threshold

(-40°C

<

=

Topt

<

=

105°C)

0.7V

<

=

-VDET<1.6V

1.0V

<

=

V

DD

<

=

5.25V

-V

DET

-30

-V

DET

+30

mV

5.25V < V

DD

<

=

6.0V

-V

DET

-26

-V

DET

+39

1.6V

<

=

-VDET

<

=

5.0V

1.0V

<

=

VDD

<

=

5.25V -VDET

×

0.98

-VDET

×

1.02

V

5.25V < VDD

<

=

6.0V -VDET

×

0.9825

-VDET

×

1.026

VHYS

Detector Threshold

Hysteresis

VDD=1.0V to 6.0V

-V

DET

×0.04

-V

DET

×

0.07

V

ISS Supply Current*1

V

SENSE

=-V

DET

-0.1V

0.31

1.47

µA

V

SENSE

=-V

DET

×1.1

0.29

1.25

R3117xxx1/2

5

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

RSENSE Sense Resistor

-V

DET

< 1.5V

6

25

MΩ

1.5V

<

=

-V

DET

< 4.7V

5

40

4.7V

<

=

-V

DET

10

40

V

DD

Operating Voltage

-40°C

<

=

Topt

<

=

105°C

1.0

6.0

V

VDDL Minimum Operating

Voltage*2

Topt=25°C

0.50

V

-40°C

<

=

Topt

<

=

105°C

0.55

IOUT Output Current

(Driver Output Pin)

Nch

VDD=0.6V, VDS=0.05V 7 µ

A

-VDET < 1.1V

V

DD

=0.6V

VDS=0.5V

0.020

mA

1.1V

<

=

-VDET < 1.6V

V

DD

=1.0V

VDS=0.5V

0.400

1.6V

<

=

-VDET < 3.1V

V

DD

=1.5V

VDS=0.5V

1.000

3.1V

<

=

-VDET

V

DD

=3.0V

VDS=0.5V

2.400

Pch*3

-VDET < 4.0V

V

DD

=4.5V

VDS=2.1V

0.650

mA

4.0V

<

=

-VDET

V

DD

=6.0V

VDS=2.1V

0.900

ILEAK

Nch Driver Leakage

Current*

4

VDD=6.0V, VDS=7.0V 140 nA

∆-VDET/

∆Topt

Detector Threshold

Temperature

Coefficient

-40°C

<

=

Topt

<

=

105°C ±30

ppm

/°C

tPHL Detector Output Delay

Time*5 VDD=5V

-V

DET

< 1.5V

80

µs

1.5V

<

=

-V

DET

40

tPLH Release Output Delay

Time*5 VDD=5V

-V

DET

< 4.5V

40

µs

4.5V

<

=

-V

DET

80

All of unit are tested and specified under load conditions such that Topt=25°C except for Detector Threshold

Temperature Coefficient, Detector Output Delay Time and Release Output Delay Time.

*1: Consumption current through SENSE pin is not included.

*2: In case that the VDD pin and SENSE pin are connected and the value shows the minimum supply voltage (VDD) when the

output voltage at detector threshold can be maintained as 0.1V or less. (In case of Nch open drain type, pull-up resistor

is 470kΩ and pull-up voltage is set at 5V for testing.) If VDD is high enough, down to 0V is acceptable for SENSE pin.

*3: In case of CMOS type

*4: In case of Nch Open Drain type

*5: In the case of CMOS output type: Time interval from forcing pulsive 6.0V to -VDET-2.0V or 0V, or from forcing 0V to

-VDET+2.0V or 6.0V to SENSE pin, to when the output voltage will reach VDD/2.

In the case of Nch Open drain output type: Output pin is pulled up to 5V with 470kΩ and time interval from forcing 6.0V

to -VDET-2.0V or 0V, or forcing pulsive 0V to -VDET+2.0V or 6.0V to when the output voltage reaches up to 2.5V.

RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)

All of electronic equipment should be designed that the mounted semiconductor devices operate within the

recommended operating conditions. The semiconductor devices cannot operate normally over the

recommended operating conditions, even if when they are used over such conditions by momentary

electronic noise or surge. And the semiconductor devices may receive serious damage when they continue

to operate over the recommended operating conditions.

R3117xxx1/2

6

ELECTRICAL CHARACTERISTICS BY DETECTOR THRESHOLD

• R3117x07xA/C to R3117x50xA/C

Bold values are checked and guaranteed by design engineering at −40

°

C

<

=

Topt

<

=

105

°

C, unless otherwise noted.

Topt=25°C

Part

Number

Detector Threshold

1.0V

<

=

V

DD

<

=

5.25V

Detector Threshold

1.0V

<

=

V

DD

<

=

5.25V

Detector Threshold

5.25V < V

DD

<

=

6.0V

Detector Threshold

5.25V < V

DD

<

=

6.0V

Detector Threshold

Hysteresis

-VDET [V]

VHYS [V]

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

R3117x07xA/C

0.6850

0.7150

0.6700

0.7300

0.6890

0.7240

0.6740

0.7390

0.028

0.049

R3117x08xA/C

0.7850

0.8150

0.7700

0.8300

0.7890

0.8240

0.7740

0.8390

0.032

0.056

R3117x09xA/C

0.8850

0.9150

0.8700

0.9300

0.8890

0.9240

0.8740

0.9390

0.036

0.063

R3117x10xA/C

0.9850

1.0150

0.9700

1.0300

0.9890

1.0240

0.9740

1.0390

0.040

0.070

R3117x11xA/C

1.0850

1.1150

1.0700

1.1300

1.0890

1.1240

1.0740

1.1390

0.044

0.077

R3117x12xA/C

1.1850

1.2150

1.1700

1.2300

1.1890

1.2240

1.1740

1.2390

0.048

0.084

R3117x13xA/C

1.2850

1.3150

1.2700

1.3300

1.2890

1.3240

1.2740

1.3390

0.052

0.091

R3117x14xA/C

1.3850

1.4150

1.3700

1.4300

1.3890

1.4240

1.3740

1.4390

0.056

0.098

R3117x15xA/C

1.4850

1.5150

1.4700

1.5300

1.4890

1.5240

1.4740

1.5390

0.060

0.105

R3117x16xA/C

1.5840

1.6160

1.5680

1.6320

1.5880

1.6256

1.5720

1.6416

0.064

0.112

R3117x17xA/C

1.6830

1.7170

1.6660

1.7340

1.6872

1.7272

1.6702

1.7442

0.068

0.119

R3117x18xA/C

1.7820

1.8180

1.7640

1.8360

1.7865

1.8288

1.7685

1.8468

0.072

0.126

R3117x19xA/C

1.8810

1.9190

1.8620

1.9380

1.8857

1.9304

1.8667

1.9494

0.076

0.133

R3117x20xA/C

1.9800

2.0200

1.9600

2.0400

1.9850

2.0320

1.9650

2.0520

0.080

0.140

R3117x21xA/C

2.0790

2.1210

2.0580

2.1420

2.0842

2.1336

2.0632

2.1546

0.084

0.147

R3117x22xA/C

2.1780

2.2220

2.1560

2.2440

2.1835

2.2352

2.1615

2.2572

0.088

0.154

R3117x23xA/C

2.2770

2.3230

2.2540

2.3460

2.2827

2.3368

2.2597

2.3598

0.092

0.161

R3117x24xA/C

2.3760

2.4240

2.3520

2.4480

2.3820

2.4384

2.3580

2.4624

0.096

0.168

R3117x25xA/C

2.4750

2.5250

2.4500

2.5500

2.4812

2.5400

2.4562

2.5650

0.100

0.175

R3117x26xA/C

2.5740

2.6260

2.5480

2.6520

2.5805

2.6416

2.5545

2.6676

0.104

0.182

R3117x27xA/C

2.6730

2.7270

2.6460

2.7540

2.6797

2.7432

2.6527

2.7702

0.108

0.189

R3117x28xA/C

2.7720

2.8280

2.7440

2.8560

2.7790

2.8448

2.7510

2.8728

0.112

0.196

R3117x29xA/C

2.8710

2.9290

2.8420

2.9580

2.8782

2.9464

2.8492

2.9754

0.116

0.203

R3117x30xA/C

2.9700

3.0300

2.9400

3.0600

2.9775

3.0480

2.9475

3.0780

0.120

0.210

R3117x31xA/C

3.0690

3.1310

3.0380

3.1620

3.0767

3.1496

3.0457

3.1806

0.124

0.217

R3117x32xA/C

3.1680

3.2320

3.1360

3.2640

3.1760

3.2512

3.1440

3.2832

0.128

0.224

R3117x33xA/C

3.2670

3.3330

3.2340

3.3660

3.2752

3.3528

3.2422

3.3858

0.132

0.231

R3117x34xA/C

3.3660

3.4340

3.3320

3.4680

3.3745

3.4544

3.3405

3.4884

0.136

0.238

R3117x35xA/C

3.4650

3.5350

3.4300

3.5700

3.4737

3.5560

3.4387

3.5910

0.140

0.245

R3117x36xA/C

3.5640

3.6360

3.5280

3.6720

3.5730

3.6576

3.5370

3.6936

0.144

0.252

R3117x37xA/C

3.6630

3.7370

3.6260

3.7740

3.6722

3.7592

3.6352

3.7962

0.148

0.259

R3117x38xA/C

3.7620

3.8380

3.7240

3.8760

3.7715

3.8608

3.7335

3.8988

0.152

0.266

R3117x39xA/C

3.8610

3.9390

3.8220

3.9780

3.8707

3.9624

3.8317

4.0014

0.156

0.273

R3117x40xA/C

3.9600

4.0400

3.9200

4.0800

3.9700

4.0640

3.9300

4.1040

0.160

0.280

R3117x41xA/C

4.0590

4.1410

4.0180

4.1820

4.0692

4.1656

4.0282

4.2066

0.164

0.287

R3117x42xA/C

4.1580

4.2420

4.1160

4.2840

4.1685

4.2672

4.1265

4.3092

0.168

0.294

R3117x43xA/C

4.2570

4.3430

4.2140

4.3860

4.2677

4.3688

4.2247

4.4118

0.172

0.301

R3117x44xA/C

4.3560

4.4440

4.3120

4.4880

4.3670

4.4704

4.3230

4.5144

0.176

0.308

R3117x45xA/C

4.4550

4.5450

4.4100

4.5900

4.4662

4.5720

4.4212

4.6170

0.180

0.315

R3117x46xA/C

4.5540

4.6460

4.5080

4.6920

4.5655

4.6736

4.5195

4.7196

0.184

0.322

R3117x47xA/C

4.6530

4.7470

4.6060

4.7940

4.6647

4.7752

4.6177

4.8222

0.188

0.329

R3117x48xA/C

4.7520

4.8480

4.7040

4.8960

4.7640

4.8768

4.7160

4.9248

0.192

0.336

R3117x49xA/C

4.8510

4.9490

4.8020

4.9980

4.8632

4.9784

4.8142

5.0274

0.196

0.343

R3117x50xA/C

4.9500

5.0500

4.9000

5.1000

4.9625

5.0800

4.9125

5.1300

0.200

0.350

R3117xxx1/2

7

ELECTRICAL CHARACTERISTICS BY DETECTOR THRESHOLD

• R3117x07xA/C to R3117x50xA/C

are checked and guaranteed by design engineering at −40

°

CTopt105

°

C, unless otherwise noted.

Topt=25°C

Sense Resistor Nch Driver Output

Current 1

Nch Driver Output

Current2

Pch Driver Output

Current

Detector Output

Delay Time

Release Output

Delay Time

RSENSE [MΩ]

IOUT1 [µA]

IOUT2 [mA]

IOUT3 [mA]

tPHL [µs]

tPLH [µs]

Min.

Typ.

Cond.

Min.

Cond.

Min.

Cond.

Min.

Cond.

Typ.

Cond.

Typ.

6 25

VDD=

0.6V

VDS=

0.05V

7

VDD=

0.6V

VDS=

0.5V

0.020

VDD=

4.5V

VDS=

2.1V

0.650

VDD=

5.0V

VSENSE=

6.0V

↓

0V

∗Note)

80

VDD=

5.0V

VSENSE=

0V

↓

-VDET

+2.0V

∗Note)

40

VDD=

1.0V

VDS=

0.5V

0.400

5

40 40

VDD=

1.5V

VDS=

0.5V

1.000

VDD=

5.0V

VSENSE=

6.0V

↓

-VDET

-2.0V

∗Note)

VDD=

3.0V

VDS=

0.5V

2.400

VDD=

6.0V

VDS=

2.1V

0.900

VDD=

5.0V

VSENSE=

0V

↓

6.0V

∗Note)

80

10

Note) 1. In the case of CMOS output type:

Time interval from forcing pulsive 6.0V to -VDET-2.0V or 0V, or from forcing 0V to -VDET+2.0V or 6.0V to

SENSE pin, to when the output voltage will reach VDD/2.

2. In the case of Nch Open drain output type:

Output pin is pulled up to 5V with 470kΩ and time interval from forcing 6.0V to -VDET-2.0V or 0V, or forcing

pulsive 0V to -VDET+2.0V or 6.0V to when the output voltage reaches up to 2.5V.

R3117xxx1/2

8

TIMING CHART

Detector Threshold

Hysteresis

t

PLH

GND

V

DDL

-

V

DET

+V

DET

Detector Threshold

Released Voltage

Minimum Operating

Voltage

Pull-up Voltage

SENSE Pin Voltage

(V

SENSE

)

Output Voltage

(V

OUT

)

R3117xxxxA

t

PLH

R3117xxxxC

t

PHL

t

PHL

Supply Voltage

(V

DD

)

Detector Threshold

Hysteresis

Supply Voltage

(V

DD

)

If the SENSE pin voltage is raised 0.5V/ms or less, it may cause noise when the output voltage is switched

from low to high.

DEFINITION OF OUTPUT DELAY TIME

Output Delay Time (tPLH) is defined as follows:

1. In the case of Nch Open Drain Output:

Under the condition of the output pin (DOUT) is pulled up through a resistor of 470kΩ to 5V, the time interval

between the rising edge of SENSE Pin pulse from 0V to (-VDET)+2.0V or the time interval of 6.0V pulse voltage

is supplied, the becoming of the output voltage to 2.5V.

2. In the case of CMOS Output:

The time interval between the rising edge of SENSE Pin pulse from 0V to (-VDET)+2.0V or the time interval of

6.0V pulse voltage is supplied, the becoming of the output voltage to VDD/2.

-V

DET

+2.0V or 6.0V

GND

5.0V

2.5V

GND

t

PLH

t

PHL

V

DDL

Minimum Operating

Voltage

Supply Voltage (V

DD

)

Output Voltage

(V

OUT

)

SENSE Pin Voltage

(V

SENSE

)

GND

t

PLH

t

PHL

-V

DET

+2.0V or 6.0V

5.0V

V

DD

/2

V

DDL

Minimum Operating Voltage

Supply Voltage (V

DD

)

Output Voltage (V

OUT

)

SENSE Pin Voltage (V

SENSE

)

Nch Open Drain Output CMOS Output

(R3117xxxxA) (R3117xxxxC)

R3117xxx1/2

9

OPERATION

• Operation of R3117xxxxA

Vref

Ra

Rb

Rc

V

DD

D

OUT

GND

Tr.1

Nch

Comparator

SENSE

D

OUT

pin should be pulled-up to

V

DD

or an external voltage level.

Block Diagram (R3117xxxxA)

+

VDET

−VDET

1

2

3

VDDL

GND

A

B

t

PLH

t

PHL

Supply Voltage (V

DD

)

Output Voltage

(V

OUT

)

SENSE Pin Voltage

(V

SENSE

)

Detector Threshold

Hysteresis

Detector Threshold

Released Voltage

Pull-up Voltage

Detect Delay Time

Output

Delay Time

Minimum Operating

Voltage

Step

1

2

3

Comparator (−)

Pin Input Voltage

I

II

I

Comparator Output

L

H

L

Tr.1

OFF

ON

OFF

Output Tr.

Nch

OFF

ON

OFF

I

×VSENSE

Rb+Rc

Ra+Rb+Rc

II

×VSENSE

Rb

Ra+Rb

Operation Diagram

• Explanation of operation

Step 1. The output voltage is equal to the pull-up voltage.

Step 2. At Point "A", Vref

>

=

VSENSE×(Rb+Rc)/(Ra+Rb+Rc) is true, as a result, the output of comparator is reversed

from "L" to "H", therefore the output voltage becomes the GND level. The voltage level of Point A means

a detector threshold voltage (-VDET). (When the supply voltage is lower than the minimum operating

voltage, the operation of the output transistor becomes indefinite. The output voltage is equal to the GND

level.)

Step 3. At Point "B", Vref

<

=

VSENSE×Rb/(Ra+Rb) is true, as a result, the output of comparator is reversed from "H"

to "L", then the output voltage is equal to the pull-up voltage. The voltage level of Point B means a

released voltage (+VDET).

∗) The difference between a released voltage and a detector threshold voltage is a detector threshold hysteresis.

R3117xxx1/2

10

• Operation of R3117xxxxC

Vref

Ra

Rb

Rc

VDD

DOUT

GND

Tr.1

Nch

Comparator

Pch

SENSE

Block Diagram (R3117xxxxC)

1

2

3

GND

A

B

tPLH

tPHL

+

V

DET

−V

DET

V

DDL

Supply Voltage (VDD)

Output Voltage

(VOUT)

SENSE Pin Voltage

(VSENSE)

Detector Threshold

Hysteresis

Detector Threshold

Released Voltage

Detect Delay Time

Output

Delay Time

Minimum Operating

Voltage

Supply Voltage

(V

DD

)

Step

1

2

3

Comparator (−)

Pin Input Voltage

I

II

I

Comparator Output

L

H

L

Tr.1

OFF

ON

OFF

Pch

ON

OFF

ON

Output Tr.

Nch

OFF

ON

OFF

I

×V

SENSE

Rb+Rc

Ra+Rb+Rc

II

×V

SENSE

Rb

Ra+Rb

Operation Diagram

• Explanation of operation

Step 1. The output voltage is equal to the supply voltage (VDD).

Step 2. At Point "A", Vref

>

=

VSENSE×(Rb+Rc)/(Ra+Rb+Rc) is true, as a result, the output of comparator is reversed

from "L" to "H", therefore the output voltage becomes the GND level. The voltage level of Point A means

a detector threshold voltage (-VDET). (When the supply voltage is lower than the minimum operating

voltage, the operation of the output transistor becomes indefinite. The output voltage is equal to the GND

level.

Step 3. At Point "B", Vref

<

=

VSENSE×Rb/(Ra+Rb) is true, as a result, the output of comparator is reversed from "H"

to "L", then the output voltage is equal to the supply voltage (VDD). The voltage level of Point B means a

released voltage (+VDET).

∗) The difference between a released voltage and a detector threshold voltage is a detector threshold hysteresis.

R3117xxx1/2

11

Power supply injection order

The R3117xxxxA/C Series supervise the voltage of the SENSE pin. VDD pin and SENSE pin can be used at the

same voltage level. Likewise, VDD pin and SENSE pin can be used at the different voltage level. If the VDD pin and

SENSE pin are used at different voltage level, regarding the start-up sequence, force the voltage level to VDD pin

prior to the SENSE pin.

If the SENSE pin voltage is equal or more than the released voltage (+VDET), DOUT pin becomes "H". Besides,

a voltage beyond VDD pin is also acceptable to SENSE pin. Concerning the R3117xxxxA series (Nch open drain

output type), DOUT pin must be pulled-up with an external resistor.

t

VDD

VOUT

VSENSE

+VDET

Fig.1 Turn on sequence

Outside setting of the detection voltage

To monitor the voltage more than 5.0V or if the different detector threshold with using lower threshold device,

divider resistors can be applied to the SENSE pin. In this usage, some error range will be generated to the

detector threshold voltage caused by the internal resistor RSENSE (Fig.3) of the IC. Supposed that the detector

threshold voltage is described as Vs, the next equation will be true.

VS = -VDET × (Ra+Rb)/Rb.

However, actually an error includes by SENSE resistance (RSENSE) of the IC inside. (Figure 3)

Ia = Ib + ISENSE ....................................... (1)

Ib = -VDET / Rb ....................................... (2)

Thus,

Ia = -VDET / Rb + ISENSE ....................................... (3)

Therefore,

VS = -VDET + Ia × Ra ....................................... (4)

R3117xxx1/2

12

Put Equation (3) into Equation (4), then

VS = -VDET × (Ra + Rb) / Rb + Ra × ISENSE

Ra × ISENSE is an error in VS.

Ra × ISENSE = Ra × (-VDET) / RSENSE

= -VDET × Ra / RSENSE

The error range is -VDET × Ra/RSENSE (Fig.3) and to make it small, choosing the low detector threshold voltage

type and set the resistance values Ra, Rb as RSENSE >>Ra. Refer to the electrical characteristics table to see the

RSENSE value.

V

DD

SENSE

GND

R3117x

Series

D

OUT

-V

DET

Ra

Rb

Vs

V

DD

R

SENSE

GND

R3117x

Series

-V

DET

Ra

Rb

Vs

I

SENSE

Ia

Ib

Fig.2 Fig.3

Accuracy Detector Threshold

If the VDD bias voltage is lager than 5.25V, and to keep the detector threshold accuracy level, or if the maximum

operating voltage line must be used as the VDD bias voltage, the input voltage must be set low by using the divider

resistors which are shown in Fig.4.

VDD

GND

R3117x

Series

DOUT

SENSE

-VDET

Ra

Rb

Vs

R2

R1

VB

Fig.4

R3117xxx1/2

13

Detector Operation vs. glitch input voltage to the SENSE pin

When the R3117x is at released, if the pulse voltage which the detector threshold or lower voltage, the graph

below means that the relation between pulse width and the amplitude of the swing to keep the released state for

the R3117x.

Detector Threshold (-V

DET

)

Over Drive

Pulse Width

Sense Voltage (V

SENSE

)

VSENSE Input Waveform

This graph shows the maximum pulse conditions to keep the released voltage. If the pulse with larger amplitude

or wider width than the graph above, is input to SENSE pin, the reset signal may be output.

R3117xxx1/2

14

TEST CIRCUITS

ISS

VIN

VDD

SENSE

GND

R3117x

Series

470kΩ

5V or VDD

VOUT

VIN

VDD

SENSE

GND

R3117x

Series

DOUT

Supply Current Test Circuit Detector Threshold Test Circuit

(Pull-up circuit is not necessary for

CMOS Output type.)

VDS

IOUT

VIN

VDD

SENSE

GND

R3117x

Series

DOUT

V

DD−

V

DS

I

OUT

V

IN

V

DD

SENSE

GND

R3117x

Series

D

OUT

V

DS

Nch Driver Output Current Test Circuit Pch Driver Output Current Test Circuit

∗Apply to CMOS Output type only

R3117xxx1/2

15

TYPICAL CHARACTERISTICS

1) Supply Current vs. Supply Voltage

R3117xxxxA/C (at released) R3117xxxxA/C (at detect)

2) Detector Threshold vs. Temperature

R3117x07xA/C R3117x30xA/C

R3117x50xA/C

R3117xxx1/2

16

3) Detector Threshold vs. Supply Voltage

R3117x07xA/C R3117x30xA/C

R3117x50xA/C

4) Hysteresis vs. Supply Voltage

R3117x07xA/C R3117x30xA/C

R3117xxx1/2

17

R3117x50xA/C

5) Output Voltage vs. SENSE pin Input Voltage (Nch Open Drain Output type is pulled up to VDD.)

R3117x07xA/C R3117x30xA/C

R3117x50xA/C

R3117xxx1/2

18

6) Nch Driver Output Current vs. Supply Voltage 7) Nch Driver Output Current vs. VDS

R3117xxxxA/C R3117xxxxA/C

8) Pch Driver Output Current vs. Supply Voltage 9) Pch Driver Output Current vs. VDS

R3117xxxxC R3117xxxxC

R3117xxx1/2

19

TYPICAL APPLICATION

• R3117xxxxA CPU Reset Circuit (Nch Open Drain Output)

(1) Input Voltage to R3117xxxxA is equal to Input Voltage to CPU

R

V

DD

RESET

CPU

GND

V

DD

470kΩ

Vs

V

DD

SENSE

GND

R3117xxxxA

Series

D

OUT

(2) Input Voltage to R3117xxxxA is unequal to Input Voltage to CPU

VDD1

R

VDD

RESET

CPU

GND

VDD2

470kΩ

Vs

VDD

SENSE

GND

R3117xxxxA

Series

DOUT

• R3117xxxxC CPU Reset Circuit (CMOS Output)

V

DD

RESET

CPU

GND

V

DD

Vs

V

DD

SENSE

GND

R3117xxxxC

Series

D

OUT

R3117xxx1/2

20

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.

Ricoh is committed to reducing the environmental loading materials in electrical devices

with a view to contributing to the protection of human health and the environment.

Ricoh has been providing RoHS compliant products since April 1, 2006 and Halogen-free products since

April 1, 2012.

Halogen Free

https://www.e-devices.ricoh.co.jp/en/

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orresponsibilityforanylossor

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