®
RT9819
Micro-Power Voltage Detectors
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 ranging 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
DD
voltage
falls below a preset threshold level. This reset signal will
last the whole period before V
DD
recovering. Once V
DD
recovered upcrossing the threshold level, the reset signal
will be released after a certain delay time. The RT9819 is
provided in SC-70-3, SC-82, SOT-23-3 and WDFN-6L
1.6x1.6 packages.
Features
Internally Fixed Threshold 1.2V to 5V in 0.1V Step
High Accuracy
±
1.5%
Low Supply Current 3μA
μ
No External Components Required
Quick Reset within 20μs
μ
Built-in Recovery Delay Include 0ms, 55ms, 220ms,
450ms Options
Low Functional Supply Voltage 0.9V
CMOS Push-Pull Output
Small SC-70-3, SC-82, SOT-23-3 and WDFN-6L
1.6x1.6 Packages
RoHS Compliant and Halogen Free
Ordering Information
RT9819 -
Package Type
U3 : SC-70-3
V : SOT-23-3
VL : SOT-23-3 (L-Type)
Y : SC-82
YR : SC-82 (R-Type)
QW : WDFN-6L 1.6x1.6 (W-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 require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
Applications
Computers
Controllers
Intelligent Instruments
Critical
μP
and
μC
Power Monitoring
Portable/Battery-Powered Equipment
Typical Application Circuit
VDD
up
RESET/
RESET
RESET/
RESET
RT9819
GND
VDD
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
is a registered trademark of Richtek Technology Corporation.
DS9819-08 July 2013
www.richtek.com
1
RT9819
Pin Configurations
(TOP VIEW)
VDD
3
VDD
3
2
2
GND
RESET/
RESET
GND
RESET/
RESET
SC-70-3
GND
4
SOT-23-3
VDD
NC
3
3
2
2
RESET/ VDD
RESET
RESET/
RESET
GND
SC-82
RESET/
RESET
4
SOT-23-3 (L-Type)
NC
3
2
VDD
GND
NC
NC
RESET/
RESET
1
2
3
GND
6
5
4
7
VDD
NC
GND
SC-82 (R-Type)
WDFN-6L 1.6x1.6
Functional Pin Description
Pin Name
GND
Ground.
Active Low Push-Pull Reset Output.
Active High Push-Pull Reset Output
Power Input.
No Internal Connection.
Pin Function
RESET
RESET
VDD
NC
Function Block Diagram
VDD
VDD
P MOS
VSET
Threshold
Voltage Setting
POR
Power On Reset
CMP
Timer
N MOS
RESET/
RESET
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9819-08 July 2013
RT9819
Absolute Maximum Ratings
(Note 1)
Terminal Voltage (with Respect to GND)
V
DD
----------------------------------------------------------------------------------------------------------------------
All Other Inputs ------------------------------------------------------------------------------------------------------
Input Current, I
VDD
---------------------------------------------------------------------------------------------------
Power Dissipation, PD @ T
A
= 25°C
SC-70-3/SC-82 -------------------------------------------------------------------------------------------------------
SOT-23-3 --------------------------------------------------------------------------------------------------------------
−
0.3V to 6V
−
0.3V to (V
DD
+ 0.3V)
20mA
0.25W
0.4W
WDFN-6L 1.6x1.6 --------------------------------------------------------------------------------------------------- 1.7W
Package Thermal Resistance (Note 2)
SC-70-3/SC-82,
θ
JA
------------------------------------------------------------------------------------------------- 400°C/W
SOT-23-3,
θ
JA
---------------------------------------------------------------------------------------------------------
WDFN-6L 1.6x1.6,
θ
JA
----------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10sec.) --------------------------------------------------------------------------
Storage Temperature Range --------------------------------------------------------------------------------------
250°C/W
58.5°C/W
260°C
−
65°C to 125°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ----------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 4)
Junction Temperature Range --------------------------------------------------------------------------------------
−
40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------
−
40°C to 85°C
Electrical Characteristics
(V
DD
= 3V, T
A
= 25°C, unless otherwise specified)
Parameter
Operating V
DD
(V
OUT
) Range
Supply Current
Reset Threshold
Threshold Voltage Accuracy
Threshold Voltage Hysteresis
V
DD
Drop to Reset Delay
RT9819A/E
Symbol
V
DD
I
DD
V
TH
ΔV
TH
V
HYS
t
RD
Test Conditions
RT9819A/B/C/D
RT9819E/F/G/H
V
TH
= 3V , V
DD
= 4.5V
Min
0.9
1.1
--
--
−1.5
--
Typ
--
--
3
1.2 to 5
--
0.01 V
TH
20
0
55
220
450
Max
6
6
8
--
1.5
--
--
--
75
297
608
Unit
V
μA
V
%
V
μs
ms
ms
ms
ms
Drop = V
TH
−125mV
--
--
RT9819B/F
Reset Active
t
Time Out Period RT9819C/G
RP
RT9819D/H
V
DD
≥
1.02
×
V
TH
35
143
292
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9819-08 July 2013
www.richtek.com
3
RT9819
Parameter
Symbol
Test Conditions
V
DD
< V
TH(MIN)
,I
SINK
= 3.5mA,
V
TH
≥
3V
RESET Output Voltage Low
V
OL
V
DD
< V
TH(MIN)
,I
SINK
= 1.2mA,
V
TH
≥
1.8V
V
TH(MIN)
> V
DD
> 1V,
I
SINK
= 0.5mA
V
DD
> V
TH(MAX)
,
I
SOURCE
= 800μA, V
TH
≥
3V
RESET Output Voltage High V
OH
V
DD
> V
TH(MAX)
,
I
SOURCE
= 500μA, V
TH
≥
1.8V
V
DD
> V
TH(MAX)
,
I
SOURCE
= 200μA, V
TH
≥
1.1V
V
DD
> V
TH(MAX)
,I
SINK
= 3.5mA,
V
TH
≥
3V
RESET Output Voltage Low
V
OL
V
DD
> V
TH(MAX)
,I
SINK
= 1.2mA,
V
TH
≥
1.8V
V
DD
> V
TH(MAX)
,I
SINK
= 0.5mA,
V
TH
≥
1.2V
1.1V < V
DD
< V
TH(MIN)
,
I
SOURCE
= 200μA
RESET Output Voltage High V
OH
1.8V < V
DD
< V
TH(MIN)
,
I
SOURCE
= 500μA
3V < V
DD
< V
TH(MIN)
,
I
SOURCE
= 800μA
Min
--
--
--
V
DD
−1.5
0.8 V
DD
0.8 V
DD
--
--
--
0.8 V
DD
0.8 V
DD
V
DD
−1.5
Typ
--
--
--
--
--
--
--
--
--
--
--
--
Max
0.4
0.3
0.3
--
--
--
0.4
0.3
0.3
--
--
--
V
V
V
V
Unit
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.
θ
JA
is measured at T
A
= 25°C on a single-layer and four-layer test board of JEDEC 51.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9819-08 July 2013
RT9819
Typical Operating Characteristics
Nch Driver Output Current vs. V
DS
2.4
2
Nch Driver Output Current vs. V
DS
60
RT9819A-12
V
DD
= 1.1V
RT9819C-30
V
DD
= 2.8V
V
DD
= 2.5V
50
Output Current (mA)
1.6
1.2
Output Current (mA)
40
30
V
DD
= 2V
20
10
0
V
DD
= 1V
0.8
0.4
0
0
0.3
0.6
0.9
1.2
1.5
V
DD
= 1.5V
0
0.5
1
1.5
2
2.5
3
3.5
V
DS
(V)
V
DS
(V)
Nch Driver Output Current vs. V
DS
120
100
Output Voltage vs. Input Voltage
7
6
RT9819A-45
RT9819A
Output Current (mA)
Output Voltage (V)
80
60
40
20
0
0
1
2
3
4
5
5
4
V
DD
= 4.4V
= 4V
= 3.5V
= 3V
= 2.5V
= 2V
= 1.5V
5V
3
2
1
0
0
1
2
3
4
5
6
2.9V
3V
V
DS
(V)
Input Voltage (V)
Supply Current vs. Input Voltage
6
5
Supply Current vs. Input Voltage
4
RT9819A-12
RT9819C-30
80°C
25°C
Supply Current IDD (uA)
Supply Current (uA)
80°C
3
4
25°C
3
2
1
0
0
1
2
3
4
5
6
2
-30°C
1
-30°C
0
0
1
2
3
4
5
6
Input Voltage (V)
Input Voltage (V)
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9819-08 July 2013
www.richtek.com
5
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