Datasheet RT9818 Datasheet (RichTek)

查询RT9818A-49GU3供应商

Micro-Power Voltage Detectors

RT9818

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 ra nging 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 V 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,

voltage falls below a preset threshold

DD

Features

zz

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

zz

z High Accuracy

zz

z Low Supply Current 3

zz

z No External Components Required

zz

z Quick Reset within 20

zz

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

zz

450ms Options

zz

z Low Functional Supply Voltage 0.9V

zz

z N-Channel Open-Drain Output

zz

z Small SC-82, SC-70-3, SOT-23-3, SOT-23-5, SOT-89

zz

Packages

zz

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

zz

±±

±1.5%

±±

μμ

μA

μμ

μs

μμ

SOT-23-3, SOT -23-5 and SOT -89 packages.

Applications

Ordering Information

RT9818

DS9818-05 March 2007 www.richtek.com

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)

Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer cial Standard)

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)

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

Marking Information

For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail.

Typical Application Circuit

100k

Pull Up

VDD

μP

RESET/

RESET

Note : RichTek Pb-free and Green 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. `100%matte tin (Sn) plating.

RT9818

GND

VDD

RESET/ RESET

1

RT9818

Pin Configurations

(TOP VIEW)

GND NC

4

1

RESET/

RESET

SC-82

5

RESET/

RESET

SOT-23-5

3

2

VDD

2

GNDVDD

RESET/

RESET

4

1

VDD

NC

3

2

GND

SC-82 (R-Type)

NCNC

4

31

RESET/

RESET

231

SOT-89

Functional Pin Description

VDD

3

1

GND

2

RESET/

RESET

SOT-23-3 (L-Type)

1

GND

VDD

3

RESET/

RESET

SC-70-3

VDD

3

2

1

RESET/

RESET

2

GND

SOT-23-3

Note : There is no pin1 indicator on top mark for SC-82 type, and pin 1 will be lower left pin when reading top mark from left to right. Pin2 of SC-82 is wider than other pins.

GNDVDD

Pin Name Pin Function

GND Ground

RESET Active Low Open-Drain Reset Output RESET Active High Open-Drain Reset Output VDD Power Pin

Function Block Diagram

VDD

VSET

Threshold

Voltage Setting

CMP

POR

Power On Reset

Timer

RESET/

RESET

N MOS

GND

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RT9818

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, P

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

VDD

@ TA = 25°C

D

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 4)

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 T emperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C z ESD Susceptibility (Note 2)

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

DD

+0.3V

Recommended Operating Conditions (Note 3)

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

Electrical Characteristics

(VDD = 3V, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Units

Operating VDD (V

) Range VDD 0.9 -- 6

OUT

Supply Current IDD VTH = 3V , VDD = 4.5V TA = 27°C -- 3 8 Reset Threshold VTH TA = 27°C -- 1.2 to 5.0 -- Th reshold Voltage Accuracy ΔVTH T

= 27°C −1.5 -- +1.5 %

A

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

-- 0 --

Reset Active Time Out Period

RT9818A/E RT9818B/F 35 55 75

VDD ≥ 1.02×VTH

t

RT9818C/G 143 220 297

RP

RT9818D/H 292 450 608 RESET Output Voltage Low (Note 5) VOL 3 = VDD < VTH I Hysteresis Width V

0.01VTH V

HYS

>3.5 mA -- -- 0.4 V

SINK

V μA V

ms

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RT9818

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

Note 4. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of

JEDEC 51-3 thermal measurement standard.

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), V

is less than 0.2V.

OL

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Typical Operating Characteristics

)

RT9818

Nch Driver Output Current vs. V

2.4

RT9818A-12

2

1.6

1.2

V

0.8

Output Current (mA

0.4

0

0 0.3 0.6 0.9 1.2 1.5

DD

V

DD

= 1.0V

DS

= 1.1V

VDS (V)

Nch Driver Output Current vs. V

120

RT9818A-45

100

80

60

40

Output Current (mA

20

0

012345

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

DS

VDS (V)

Nch Driver Output Current vs. V

60

RT9818C-30

50

V

DD

= 2.0V

40

30

20

Output Current (mA

10

0

0 0.5 1 1.5 2 2.5 3 3.5

V

DD

= 1.5V

V

DD

= 2.5V

DS

= 2.8V

VDS (V)

Output Voltage vs. Input Voltage

7

RT9818

6

5

4

3

2

Output Volgate ( V)

1

0

0123456

1.2V

Inpu t Volgate ( V )

4.5V

Supply Current v s . Input Voltage

6

RT9818A-12

5

4

3

2

Supply Cur rent ( uA

1

0

0123456

80°C

25°C

-30°C

Inp ut Voltage (V)

4

3.5 3

2.5 2

1.5 1

Supply Cur rent (uA

0.5 0

Supply Current v s . Input Voltage

RT9818C-30

80°C

25°C

-30°C

0123456

Inp ut Voltage (V)

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5

RT9818

)

Supply Current v s . Input Voltage

4

RT9818A-45

3.5 3

2.5 2

1.5 1

Supply Cur rent (uA

0.5 0

0123456

80°C 25°C

-30°C

Inp ut Voltage (V)

Power-Down Reset Delay vs. Temperature

45

RT9818C-30

40 35 30 25 20 15 10

5

Power-Down Reset Delay (us)

0

-50 -25 0 25 50 7 5 100 125

V

= 200mV

DROP

Temperature

V

DROP

(°C)

= 150mV

= 250mV

Power-Down Reset Dela y vs. Temperature

14

RT9818A-12

12

10

V

8

6

4

2

DROP

= 200mV

V

DROP

= 150mV

= 250mV

Power-Down Reset Delay (us)

0

-50 -25 0 25 50 75 100 125

Temperature

(°C)

Power-Down Reset Delay vs. Temperatu re

45

RT9818A-45

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

V

(°C)

DROP

= 150mV

= 250mV

Reset Threshold Deviation vs. Temperature

6

RT9818

5.0V

5

4

3

Reset Threshold (V )

2

1

-50 -25 0 25 50 75 100 125

Temperature

4.5V

4.2V

2.2V

1.2V

(°C)

Nch Driver Sink Current vs. Input Voltage

40

RT9818C-30, V

35 30

(mA)

25

SINK

20 15 10

Sink Current I

5 0

00.511.522.533.5

= 0.5V

DS

25°C

Inpu t Volt age(V)

-30°C

80°C

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RT9818

)

Nch Driver Sink Current vs. Input Voltage

50

RT9818A-45, V

40

DS

= 0.5V

-30°C

25°C

(mA)

30

SINK

80°C

20

Sink Current I

10

0

012345

Inpu t Voltage(V)

Power-Up Reset Time-Out vs. Temperature

100

RT9818A

80

Power-Up Reset Time-Out v s. Tem pe rature

500

RT9818C

400

V

= 2.9V

TH

300

V

200

100

TH

= 3.0V

Power-Up Reset Time-Out (ms)

0

-50 -25 0 25 50 75 100 125

Temperature

(°C)

Output Dela y Time vs. Load Capacitance

1000

RT9818

100

60

V

= 5.0V

TH

40

20

V

TH

= 4.5V

Power-Up Reset Time-Out (us)

0

-50 -25 0 25 50 75 100 125

160 140 120 100

80 60 40 20

Temperature

Nch Driver Output Current vs. V

RT9818G-31

(°C)

DS

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

Nch Driver Output Current (mA) 1

0

0123456

VDS (V)

10

V

= 1.2V

TH

1

0.1

Output Delay Time (ms

V

= 4.5V

TH

0.01

0.0001 0.0010 0.0100 0.1000 1.0000

Load Capacitance (uF)

Nch Driver Output Current vs. Input Voltage

60

RT9818G-31 VDS = 0.5V

50

40

30

20

10

Nch Driver Output Current (mA) 1

0

0123456

Inp ut Voltage (V)

-30°C

25°C

80°C

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RT9818

)

Power Down Reset Time-Out vs. Temperature

500

RT9818G-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. Temperature

30

RT9818G-31

25

20

V

= 200mV

DROP

15

V

DROP

= 150mV

Output Voltage vs. Input Voltage

7

RT9818G-31

6

5

4

3

2

Output V oltage ( V )

1

0

0123456

Inpu t Volt age (V)

10

5

V

DROP

= 250mV

Power-Down Reset Time-Out (us

0

-50 -25 0 25 50 75 100 125

Temperature

(°C)

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RT9818

Application Information

Multiple Supplies

Mainly , the pull-up connected to the R T9818 will connect to the supply voltage that is being monitored at the IC’s VDD pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply .

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.

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RT9818

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

A1

H

L

B 1.150 1.350 0.045 0.054

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

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RT9818

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

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RT9818

D

C

e

A

b

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

B

A1

H

L

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

12

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RT9818

H

D

L

C

b

A

e

Dimensions In Millimeters 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 0.559 0.014 0.022 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122

B

A1

e 0.838 1.041 0.033 0.041 H 0.080 0.254 0.003 0.010

L 0.300 0.610 0.012 0.024

SOT-23-5 Surface Mount Package

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RT9818

D

D1

A

C

e

A

b

b1

b

B

C1

H

Dimensions In Millimeters Dimensions In Inches

Symbol

Min Max Min Max

A 1.397 1.600 0.055 0.063 b 0.356 0.483 0.014 0.019 B 2.388 2.591 0.094 0.102

b1 0.406 0.533 0.016 0.021

C 3.937 4.242 0.155 0.167

C1 0.787 1.194 0.031 0.047

D 4.394 4.597 0.173 0.181

D1 1.397 1.753 0.055 0.069

e 1.448 1.549 0.057 0.061

H 0.356 0.432 0.014 0.017

3-Lead SOT-89 Surface Mount Package

Richtek Technology Corporation

Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611

14

Richtek Technology Corporation

Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com

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