Richtek RT9819A-23GVL, RT9819A-24GVL, RT9819A-25GVL, RT9819A-27GV, RT9819A-27PV Schematic [ru]

Micro-Power Voltage Detectors

RT9819

General Description

The RT9819 is a micro-power voltage detector
supervising the power supply voltage level for
microprocessors (μP) or digital systems. It provides
internally fixed threshold levels with 0.1V per step ra nging
from 1.2V to 5V , which covers most digital applications. It
features low supply current of 3μA. The RT9819 performs
supervisory function by sending out a reset signal
whenever the V

voltage falls below a preset threshold

DD

level. This reset signal will last the whole period before
VDD recovering. Once VDD recovered upcrossing the
threshold level, the reset signal will be released after a
certain delay time. RT9819 is provided in SC-70-3,

SC-82 and SOT -23-3 packages.

Ordering Information

RT9819

Note :
Richtek products are :

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

` Suitable for use in SnPb or Pb-free soldering processes.

­Package Type

U3 : SC-70-3
V : SOT-23-3
VL : SOT-23-3 (L-Type)
Y : SC-82
YR : SC-82 (R-Type)

Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)

Threshold Voltage
12 : 1.2V
13 : 1.3V
:
49 : 4.9V
50 : 5.0V

Reset Active Timeout Period
A = 0ms

(RESET)

B = 55ms (RESET)
C = 220ms (RESET)
D = 450ms (RESET)
E = 0ms (RESET)
F = 55ms (RESET)
G = 220ms (RESET)
H = 450ms (RESET)

Features

zz

Internally Fixed Threshold 1.2V to 5V in 0.1V Step

z

zz

zz

z High Accuracy

zz

zz

z Low Supply Current 3

zz

zz

z No External Components Required

zz

zz

z Quick Reset within 20

zz

zz

z Built-in Recovery Delay Include 0ms, 55ms, 220ms,

zz

±±

±1.5%

±±

μμ

μA

μμ

μμ

μs

μμ

450ms Options

zz

z Low Functional Supply Voltage 0.9V

zz

zz

z CMOS Push-Pull Output

zz

zz

z Small SC-70-3, SC-82 and SOT-23-3 Packages

zz

zz

z RoHS Compliant and 100% Lead (Pb)-Free

zz

Applications

z Computers
z Controllers
z Intelligent Instruments
z Critical μP and μC Power Monitoring
z Portable/Battery-Powered Equipment

Typical Application Circuit

VDD

up

RESET/

RESET

RT9819

VDDGND

RESET/

RESET

Marking Information

For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.

DS9819-07 April 2011 www.richtek.com

1

RT9819

Pin Configurations

(TOP VIEW)

GND

VDD

3

2

RESET/

RESET

GND

4

RESET/

RESET

NC

3

2

VDD

Functional Pin Description

Pin Name Pin Function

GND Ground

RESET Active Low Push-Pull Reset Output
RESET Active High Push-Pull Reset Output
VDD Power Pin

Function Block Diagram

VDD

RESET/

RESET

4

VDD

NC

3

2

GND

VDD

GND

VDD

3

2

RESET/

RESET

RESET/

RESET

SOT-23-3 (L-Type)SOT-23-3SC-70-3 SC-82 (R-Type)SC-82

VDD

3

2

GND

VSET

Threshold

Voltage Setting

CMP

POR

Power On Reset

Timer

P MOS

N MOS

RESET/

RESET

DS9819-07 April 2011www.richtek.com

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RT9819

Absolute Maximum Ratings (Note 1)

z T erminal V oltage (with Respe ct to GND)

VDD------------------------------------------------------------------------------------------------------------------------ −0.3V to 6.0V

z All Other Inputs -------------------------------------------------------------------------------------------------------- −0.3V to V
z Input Current, I
z Power Dissipation, PD @ T

----------------------------------------------------------------------------------------------------- 20mA

VDD

= 25°C

A

SC-70-3/SC-82 --------------------------------------------------------------------------------------------------------- 0.25W
SOT-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4W

z Package Thermal Resistance (Note 2)

SC-70-3/SC-82, θJA--------------------------------------------------------------------------------------------------- 400°C /W
SOT-23-3, θJA----------------------------------------------------------------------------------------------------------- 250°C /W

z Lead Te mperature (Soldering, 10sec.)---------------------------------------------------------------------------- 260°C
z Storage T emperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C
z ESD Susceptibility (Note 3)

HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Ma chine Mode)-------------------------------------------------------------------------------------------------- 200V

Recommended Operating Conditions (Note 4)

DD

+0.3V

z Junction T emperature Range---------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient T emperature Range---------------------------------------------------------------------------------------- −40°C to 85°C

Electrical Characteristics

(VDD = 3V, TA = 25°C, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Units

Operati ng VDD (V

) Range VDD

OUT

Supply Current IDD V
Reset Threshold VTH -- 1.2 to 5.0 -- V
Threshold Voltage Accuracy ΔVTH −1.5 -- +1.5 %
Threshold Voltage Hysteresis V

HYS

VDD Drop to Reset Delay tRD Drop = VTH −125mV -- 20 -- μs

RT9819A/E

Reset Active
Time Out Period

RT9819B/F 35 55 75 ms

VDD ≥ 1.02 × VTH

t

RT9819C/G 143 220 297 ms

RP

RT9819D/H 292 450 608 ms

RESET Outp ut Voltage Low

V

OL

RT9819A/B/C/D 0.9 -- 6

V

RT9819E/F/G/H 1.1 -- 6

= 3V , VDD = 4.5V -- 3 8 μA

TH

-- 0.01 VTH -- V

-- 0 -- ms

V

< V

DD

≥ 3V

V

TH

VDD < V

≥ 1.8V

V

TH

V

TH(MIN)

= 0.5mA

I

SINK

TH(MIN)

TH(MIN)

,I

SINK

,I

SINK

> VDD > 1V,

= 3.5mA,

= 1.2mA,

-- -- 0.4

-- -- 0.3

-- -- 0.3

V

To be continued

DS9819-07 April 2011 www.richtek.com

3

RT9819

Parameter Symbol Test Conditions Min Typ Max Units

V

> V

DD

TH(MAX)

RESET Output Voltage High

V

OH

RESET Output Voltage Low VOL

RESET Output Voltage High VOH

I

SOURCE

VDD > V
I

SOURCE

VDD > V
I

SOURCE

V
V

VDD > V
V

VDD > V
V

1.1V < V
I

SOURCE

1.8V < VDD < V
I

SOURCE

DD
TH

TH

TH

= 800μA, V

TH(MAX)

= 500μA, V

TH(MAX)

= 200μA, V

> V

TH(MAX)

≥ 3V

TH(MAX)

≥ 1.8V

TH(MAX)

≥ 1.2V

DD

= 200μA

= 500μA

3V < VDD < V
I

SOURCE

Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for

stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.

Note 2. θ

Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.

is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of

JA

JEDEC 51-3 thermal measurement standard.

= 800μA

< V

TH(MIN)

,

TH

,

TH

,

TH

,I

SINK

,I

SINK

,I

SINK

TH(MIN)

TH(MIN)

,

≥ 3V

≥ 1.8 V

≥ 1.1 V

= 3. 5mA ,

= 1. 2mA ,

= 0. 5mA ,

,

,

−1.5 -- --

V

DD

0.8 V

0.8 V

-- --

DD

-- --

DD

-- -- 0.4

-- -- 0.3

-- -- 0.3

0.8 V

0.8 V

V

DD

-- --

DD

-- --

DD

−1.5 -- --

V

V

V

DS9819-07 April 2011www.richtek.com

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Typical Operating Characteristics

RT9819

Nch Driver Out put Curre nt vs. V

2.4

RT9819A-12

2

1.6

1.2

V

0.8

DD

Output Current (mA)

0.4

0

0 0.3 0.6 0.9 1.2 1.5

VDS (V)

Nch Driver Output Current vs. V

120

RT9819A-45

100

80

60

40

Output C urrent (mA)

20

VDD = 4.4V
= 4.0V
= 3.5V
= 3.0V
= 2.5V
= 2.0V
= 1.5V

V

DD

= 1.0V

DS

= 1.1V

DS

Nch Driver Output Current vs. V

60

RT9819C-30

V

= 2.8V

V

DD

= 2.0V

DD

= 2.5V

50

40

30

20

Output Current (mA)

10

0

00.511.522.533.5

V

DD

V

= 1.5V

DD

VDS (V)

Output Voltage vs. Input Voltage

7

RT9819A

6

5

4

3

2

Output V oltage (V)

1

2.9V

3.0V

DS

5.0V

0

012345

VDS (V)

Supply Current vs. Input Voltage

6

RT9819A-12

5

4

3

2

Supply Current (uA)

1

0

0123456

Inpu t Voltage (V)

80°C

25°C

-30°C

0

0123456

Inp ut Voltag e (V)

Supply Current vs. Input Voltage

4

RT9819C-30

3

2

1

Supply Current IDD (uA)

0

0123456

Inpu t Voltage (V)

80°C

25°C

-30°C

DS9819-07 April 2011 www.richtek.com

5

RT9819

Supply C ur re nt vs. Input Voltage

4

RT9819A-45

80°C

3

2

1

Supply Current (uA)

0

0123456

25°C

-30°C

Input Voltage (V )

Power-Down Reset Delay vs. Temperature

45

RT9819C-30

40
35
30
25
20
15
10

5

Power-Down Reset Delay ( us)

0

-50 -25 0 25 50 75 100 125

V

= 200mV

DROP

Temperature

(°C)

V

V

DROP

DROP

= 150mV

= 250mV

Power-Down Reset Delay vs. Temperatu re

15

RT9819A-12

12

9

6

3

V

DROP

= 200mV

V

V

DROP

DROP

= 150mV

= 250mV

Power-Down Reset Delay (us)

0

-50-25 0 25 50 75100125

Temperature

(°C)

Power-Down Reset Delay vs . Tem perature

45

RT9819A-45

40
35
30

V

25
20
15
10

5

Power-Down Reset Delay (us)

0

-50 -25 0 25 50 75 100 125

= 200mV

DROP

Temperature

(°C)

V

V

DROP

DROP

= 150mV

= 250mV

Nch Driver Sink C urrent vs. Input Voltage

40

RT9819C-30, V

30

(mA)

SINK

20

10

Sink Cur rent I

0

00.511.522.533.5

= 0.5V

DS

25°C

Input Vol tage ( V )

-30°C

80°C

Nch Driver Sink Current vs. Input Voltage

50

RT9819A-45, V

40

(mA)

30

SINK

20

10

Sink Cur rent I

0

012345

= 0.5V

DS

25°C

Input Voltage (V )

-30°C

80°C

DS9819-07 April 2011www.richtek.com

6

RT9819

Reset Threshold Deviation vs. Temperature

6.00

RT9819

5.0V

5.00

4.00

3.00

2.00

Reset Threshold Deviati on (V)

1.00

-50 -25 0 25 50 75 100 125

Temperature

4.5V

4.2V

2.2V

1.2V

(°C)

Power-Up Reset Time-Out vs. Temperature

500

RT9819C

400

V

= 2.9V

V

TH

TH

= 3.0V

300

200

100

Pch Driv er Output Current vs. Input Voltage

25

RT9819C-30

20

15

10

Output Current (mA)

5

0

0123456

VDS = 2.1V

VDS = 1.5V

VDS = 1.0V

VDS = 0.5V

Inpu t Voltage (V)

Power-Up Reset Time-Out vs. Temperature

100

RT9819A

(μs)

75

V

= 5.0V

V

TH

TH

= 4.5V

50

25

Power-Up Reset Time-Out ( m s)

0

-50 -25 0 25 50 75 100 125

Temperature

(°C)

Output Delay Time vs. Load Capacitance

1000

RT9819

100

10

V

= 3.0V

TH

1

V

= 2.9V

TH

TH

= 5.0V

Load Capacitance (uF)

0.1

Output Delay Time (ms)

0.01

V

0.0001 0.0010 0.0100 0.1000 1.0000

Power-Up Reset Time-Out (ms)

0

-50 -25 0 25 50 75 100 125

Temperature

(°C)

Nch Driver Output Current vs. V

160

RT9819G-31

140
120
100

80
60
40
20

Nch Driver Output Current (mA )

0

0123456

V

(V)

DS

VDD = 6.0V
= 5.5V
= 5.0V
= 4.5V
= 4.0V
= 3.5V

DS

DS9819-07 April 2011 www.richtek.com

7

RT9819

)

)

Nch Driver Output Current vs. Input Voltage

60

RT9819G-31
VDS = 0.5V

50

40

30

20

10

-30°C

25°C

80°C

Nch Driver Output Current (mA) 1

0

0123456

Inpu t Voltage (V)

Output Voltage vs. Input Voltage

7

RT9819G-31

6

5

4

3

2

Output Voltage (V)

1

0

0123456

Inpu t Voltage (V)

Power Down Reset Time-Out vs. Temperature

500

RT9819G-31

400

300

200

100

Power Down Reset Time-Out (ms

0

-50 -25 0 25 50 75 100 125

Temperature

(°C)

Power-Down Reset Time-Out vs. Tem perature

30

RT9819G-31

25

20

V

= 200mV

DROP

15

10

5

Power-Down Reset Time-Out (us

0

-50 -25 0 25 50 75 100 125

Temperature

V

V

(°C)

DROP

DROP

= 150mV

= 250mV

DS9819-07 April 2011www.richtek.com

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RT9819

Application Information

Benefits of Highly Accurate Reset Threshold

Most μP supervisor ICs have reset threshold voltages between 1% and 1.5% below the value of nominal supply voltages.
This ensures a reset will not occur within 1% of the nominal supply, but will occur when the supply is 1.5% below
nominal.

DS9819-07 April 2011 www.richtek.com

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RT9819

Outline Dimension

D

C

e

A

b

Dimensions In M illimeters Dimensions In Inches

Symbol

Min Max Min Max

A 0.800 1.100 0.031 0.044

A1 0.000 0.100 0.000 0.004

B 1.150 1.350 0.045 0.054

B

A1

H

L

b 0.150 0.400 0.006 0.016
C 1.800 2.450 0.071 0.096
D 1.800 2.250 0.071 0.089

e 1.300 0.051
H 0.080 0.260 0.003 0.010

L 0.210 0.460 0.008 0.018

SC-70-3 Surface Mount Package

10

DS9819-07 April 2011www.richtek.com

RT9819

D

e

C

b

A

e

Dimensions In Millimeters Dimensions In Inches

Symbol

Min Max Min Max

A 0.800 1.100 0.031 0.043

A1 0.000 0.100 0.000 0.004

B 1.150 1.350 0.045 0.053

B

b1

A1

H

L

b 0.150 0.400 0.006 0.016

b1 0.350 0.500 0.014 0.020

C 1.800 2.450 0.071 0.096
D 1.800 2.200 0.071 0.087

e 1.300 0.051
H 0.080 0.260 0.003 0.010

L 0.200 0.460 0.008 0.018

SC-82 Surface Mount Package

DS9819-07 April 2011 www.richtek.com

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RT9819

D

C

e

A

b

B

A1

H

L

Dimensions In M illimeters Dimensions In Inches

Symbol

Min Max Min Max

A 0.889 1.295 0.035 0.051

A1 0.000 0.152 0.000 0.006

B 1.397 1.803 0.055 0.071
b 0.356 0.508 0.014 0.020
C 2.591 2.997 0.102 0.118
D 2.692 3.099 0.106 0.122
e 1.803 2.007 0.071 0.079
H 0.080 0.254 0.003 0.010
L 0.300 0.610 0.012 0.024

SOT-23-3 Surface Mount Package

Richtek Technology Corporation

Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: [phone] Fax: [phone]

Richtek Technology Corporation

Taipei Office (Marketing)
5F, No. 95, Minchiuan Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: [phone] Fax: [phone]
Email: [e-mail]

Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design,
specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed
by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.

DS9819-07 April 2011www.richtek.com

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