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

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z Low Functional Supply Voltage 0.9V

zz

zz

z CMOS Push-Pull Output

zz

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

zz

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

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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

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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

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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

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