Richtek RT9818A-13PY, RT9818A-14PV, RT9818A-15PV, RT9818A-16PV, RT9818A-18GV Schematic [ru]

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Micro-Power Voltage Detectors
General Description
The RT9818 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 ranging from 1.2V to 5V, which covers most digital applications. It features low supply current of 3μA. The RT9818 performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset threshold 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. RT9818 is provided in SC-82, SC-70-3, SOT-23-3, SOT-23-5 and SOT-89 packages.
Ordering Information
RT9818 -
Package Type
U3 : SC-70-3
V : SOT-23-3
VL : SOT-23-3 (L-Type) B : SOT-23-5
X : SOT-89
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)
Note :
Richtek products are :
` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9818-10 May 2013

RT9818

Features

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

zHigh Accuracy ±1.5%

zLow Supply Current 3μA

zNo External Components Required

zQuick Reset within 20μs

zBuilt-in Recovery Delay Include 0ms, 55ms, 220ms, 450ms Options

zLow Functional Supply Voltage 0.9V

zN-Channel Open-Drain Output

zSmall SC-82, SC-70-3, SOT-23-3, SOT-23-5, SOT-89 Packages

zRoHS Compliant and 100% Lead (Pb)-Free

Applications

zComputers

zControllers

zIntelligent Instruments

zCritical μP and μC Power Monitoring

zPortable/Battery-Powered Equipment

Marking Information

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

Typical Application Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100k

 

RT9818

 

 

 

 

 

 

 

 

 

 

 

 

 

Pull Up

 

 

GND

 

 

VDD

 

 

 

 

 

 

 

 

 

 

 

 

VDD

 

 

 

μP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET/

 

RESET/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET

 

 

RESET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

1

RT9818

Pin Configurations

(TOP VIEW)

 

 

GND

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

VDD

 

 

 

RESET/

 

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET/

 

 

 

 

 

 

 

 

 

 

 

GND

RESET/

 

 

 

VDD

GND

 

 

RESET

 

 

 

 

 

 

 

 

 

 

 

RESET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SC-82

SC-82 (R-Type)

 

SC-70-3

VDD

VDD

NC

NC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

3

 

 

5

 

 

4

 

2

 

2

 

2

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

GND

 

 

 

 

RESET/

 

 

 

 

 

 

 

 

 

RESET/

 

 

RESET/

 

 

 

 

VDD GND

 

 

RESET/

 

 

 

 

 

 

RESET

RESET

 

 

 

 

 

 

RESET

RESET

 

 

 

 

 

 

SOT-23-3

SOT-23-3 (L-Type)

SOT-23-5

SOT-89

 

 

 

 

 

Functional Pin Description

 

Pin Name

Pin Function

GND

Ground

 

Active Low Open-Drain Reset Output

 

RESET

 

RESET

Active High Open-Drain Reset Output

VDD

Power Pin

Function Block Diagram

 

 

 

VDD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CMP

 

Timer

 

 

 

 

 

 

 

 

 

N MOS

 

VSET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Threshold

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage Setting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power On Reset

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Timing Diagram

 

VDD

 

VTH

 

0V

 

VRESET

 

Delay Time (0, 55, 220, 450ms)

 

0V

 

VRESET

 

Delay Time (0, 55, 220, 450ms)

 

0V

Copyright ©2013 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS9818-10 May 2013

2

 

 

RT9818

Absolute Maximum Ratings (Note 1)

 

z Terminal Voltage (with Respect to GND)

 

VDD ---------------------------------------------------------------------------------------------------------------------

−0.3V to 6V

z All Other Inputs -----------------------------------------------------------------------------------------------------

−0.3V to (VDD + 0.3V)

z Input Current, IVDD --------------------------------------------------------------------------------------------------

20mA

z Power Dissipation, PD @ TA = 25°C

 

SC-70 / SC-82-------------------------------------------------------------------------------------------------------

0.25W

SOT-23-3 -------------------------------------------------------------------------------------------------------------

0.4W

SOT-23-5 -------------------------------------------------------------------------------------------------------------

0.4W

SOT-89 ----------------------------------------------------------------------------------------------------------------

0.55W

z Package Thermal Resistance (Note 2)

 

SC-70 / SC-82, θJA -------------------------------------------------------------------------------------------------

400°C/W

SOT-23-3, θJA --------------------------------------------------------------------------------------------------------

250°C/W

SOT-23-5, θJA --------------------------------------------------------------------------------------------------------

250°C/W

SOT-89, θJA ----------------------------------------------------------------------------------------------------------

180°C/W

z Lead Temperature (Soldering, 10sec.)-------------------------------------------------------------------------

260°C

z Storage Temperature Range -------------------------------------------------------------------------------------

−65°C to 150°C

z ESD Susceptibility (Note 3)

 

HBM (Human Body Model) ---------------------------------------------------------------------------------------

2kV

Recommended Operating Conditions

(Note 4)

z Junction Temperature Range -------------------------------------------------------------------------------------

−40°C to 125°C

z Ambient Temperature Range -------------------------------------------------------------------------------------

−40°C to 85°C

Electrical Characteristics

(VDD = 3V, unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Operating VDD (VOUT) Range

VDD

 

0.9

--

6

V

Supply Current

 

IDD

VTH = 3V, VDD = 4.5V, TA = 27°C

--

3

8

μA

Reset Threshold

 

VTH

TA = 27°C

--

1.2 to 5

--

V

Threshold Voltage Accuracy

VTH

TA = 27°C

−1.5

--

1.5

%

VDD Drop to Reset Delay

tRD

Drop = VTH −125mV

--

20

--

μs

 

RT9818A/E

 

 

--

0

--

 

Reset Active

RT9818B/F

tRP

VDD ≥ 1.02 x VTH

35

55

75

ms

Time Out Period

RT9818C/G

143

220

297

 

RT9818D/H

 

 

292

450

608

 

RESET Output Voltage Low

VOL

3 = VDD < VTH ISINK > 3.5mA

--

--

0.4

V

(Note 5)

 

 

 

 

 

 

 

 

Hysteresis Width

 

VHYS

 

--

0.01VTH

0.016VTH

V

Copyright ©2013 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS9818-10 May 2013

www.richtek.com

 

3

RT9818

Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and 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 may affect device reliability.

Note 2. θJA is measured at TA = 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3. Note 3. Devices are ESD sensitive. Handling precaution is recommended.

Note 4. The device is not guaranteed to function outside its operating conditions.

Note 5. The voltage VOL can be calculated by VOL = VDD − Ir * R. Where R is the pull-up resistor and Ir is the current flowing through the pull-up resistor. For typical application (R=100kΩ), VOL is less than 0.2V.

Copyright ©2013 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS9818-10 May 2013

4

 

Richtek RT9818A-13PY, RT9818A-14PV, RT9818A-15PV, RT9818A-16PV, RT9818A-18GV Schematic

RT9818

Typical Operating Characteristics

Nch Driver Output Current vs. VDS

 

2.4

RT9818A-12

 

 

 

 

 

 

 

 

 

 

(mA)

2.0

 

 

 

VDD = 1.1V

 

 

 

 

 

 

 

 

 

 

 

 

Current

1.6

 

 

 

 

 

1.2

 

 

 

 

 

Output

 

 

 

 

 

0.8

 

 

 

VDD = 1V

 

 

 

 

 

 

 

 

 

 

 

 

 

0.4

 

 

 

 

 

 

0.0

 

 

 

 

 

 

0

0.3

0.6

0.9

1.2

1.5

VDS (V)

 

120

Nch Driver Output Current vs. VDS

 

 

RT9818A-45

 

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

(mA)

80

 

 

 

 

 

Current

60

 

 

 

VDD = 4.4V

 

 

 

 

 

 

 

 

 

 

 

 

Output

 

 

 

 

= 4V

 

40

 

 

 

= 3.5V

 

 

 

 

 

 

= 3V

 

 

20

 

 

 

= 2.5V

 

 

 

 

 

= 2V

 

 

 

 

 

 

 

 

 

 

 

 

= 1.5V

 

 

0

 

 

 

 

 

 

0

1

2

3

4

5

VDS (V)

Supply Current vs. Input Voltage

 

6

RT9818A-12

 

 

 

 

 

(μA)

5

 

 

 

80°C

 

 

4

 

 

 

 

 

 

Current

 

 

 

 

 

 

 

 

 

 

25°C

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

Supply

2

 

 

 

−30°C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

0

1

2

3

4

5

6

Input Voltage (V)

Nch Driver Output Current vs. VDS

 

60

RT9818C-30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

VDD = 2.8V

 

 

 

 

 

 

 

 

(mA)

40

 

 

 

 

VDD = 2.5V

 

Current

30

 

 

 

 

VDD = 2V

 

 

 

 

 

 

 

 

 

Output

20

 

 

 

 

 

 

 

 

 

 

VDD = 1.5V

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

0

0.5

1

1.5

2

2.5

3

3.5

VDS (V)

Output Voltage vs. Input Voltage

 

7

RT9818

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

(V)

5

 

 

 

 

 

 

Voltage

4

 

 

 

 

 

 

3

 

 

 

 

 

 

Output

 

 

 

 

 

 

2

 

 

 

 

4.5V

 

 

 

 

 

 

 

 

1

 

1.2V

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

0

1

2

3

4

5

6

Input Voltage (V)

Supply Current vs. Input Voltage

 

4.0

RT9818C-30

 

 

 

 

 

 

 

 

 

 

 

 

 

3.5

 

 

 

 

 

 

A)

3.0

 

 

 

80°C

 

 

 

 

 

 

 

 

 

Current

2.5

 

 

 

25°C

 

 

2.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Supply

1.5

 

 

 

−30°C

 

 

 

 

 

 

 

 

1.0

 

 

 

 

 

 

 

0.5

 

 

 

 

 

 

 

0.0

 

 

 

 

 

 

 

0

1

2

3

4

5

6

Input Voltage (V)

Copyright ©2013 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS9818-10 May 2013

www.richtek.com

 

5

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