RICHTEK RT9819A

RT9819
Micro-Power Voltage Detectors
General Description
Features
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 VDD voltage falls below a preset threshold
level. This reset signal will last the whole period before
VDD recovering. Once VDD recovered upcrossing the
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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.
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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)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commercial 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)
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Internally Fixed Threshold 1.2V to 5V in 0.1V Step
High Accuracy ±1.5%
Low Supply Current 3μ
μA
No External Components Required
Quick Reset within 20μ
μs
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 and SOT-23-3 Packages
RoHS Compliant and 100% Lead (Pb)-Free
Applications
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Computers
Controllers
Intelligent Instruments
Critical μP and μC Power Monitoring
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
RT9819
VDD
GND
VDD
up
RESET/
RESET
RESET/
RESET
Note :
RichTek Pb-free and Green 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.
`100%matte tin (Sn) plating.
DS9819-05 August 2007
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RT9819
Pin Configurations
(TOP VIEW)
VDD
GND
NC
RESET/
RESET
NC
3
4
3
4
3
VDD
VDD
3
3
1
2
1
2
1
2
1
2
1
2
GND
RESET/
RESET
RESET/
RESET
VDD
VDD
GND
GND
RESET/
RESET
RESET/
RESET
GND
SC-82
SC-70-3
SC-82 (R-Type)
SOT-23-3
SOT-23-3 (L-Type)
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.
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
VDD
P MOS
VSET
CMP
Timer
RESET/
RESET
N MOS
Threshold
Voltage Setting
POR
Power On Reset
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RT9819
Absolute Maximum Ratings
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(Note 1)
Terminal Voltage (with Respect to GND)
VDD ------------------------------------------------------------------------------------------------------------------------ −0.3V to 6.0V
All Other Inputs -------------------------------------------------------------------------------------------------------- −0.3V to VDD+0.3V
Input Current, IVDD ----------------------------------------------------------------------------------------------------- 20mA
Power Dissipation, PD @ TA = 25°C
SC-70-3/SC-82 --------------------------------------------------------------------------------------------------------- 0.25W
SOT-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4W
Package Thermal Resistance (Note 4)
SC-70-3/SC-82, θJA --------------------------------------------------------------------------------------------------- 400°C /W
SOT-23-3, θJA ----------------------------------------------------------------------------------------------------------- 250°C /W
Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260°C
Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
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(Note 3)
Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range ---------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VDD = 3V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
RT9819A/B/C/D
0.9
--
6
RT9819E/F/G/H
1.1
--
6
--
3
8
μA
--
1.2 to 5.0
--
V
Operating V DD (VOUT) Range
V DD
Supply Current
IDD
Reset Threshold
V TH
Threshold Voltage Accuracy
ΔVTH
−1.5
--
+1.5
%
Threshold Voltage Hysteresis
V HYS
--
0.01 VTH
--
V
V DD Drop to Reset Delay
tRD
--
20
--
μs
--
0
--
ms
35
55
75
ms
143
220
297
ms
292
450
608
ms
VDD < VTH(MIN) ,ISINK = 3.5mA,
VTH ≥ 3V
--
--
0.4
VDD < VTH(MIN) ,ISINK = 1.2mA,
VTH ≥ 1.8V
--
--
0.3
VTH(MIN) > VDD > 1V,
ISINK = 0.5mA
--
--
0.3
VT H = 3V , V DD = 4.5V
Drop = VTH −125mV
RT9819A/E
Reset Active
Time Out Period
RT9819B/F
RT9819C/G
tRP
VDD ≥ 1.02 × VTH
RT9819D/H
RESET Output Voltage Low
V OL
V
V
To be continued
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RT9819
Parameter
Symbol
RESET Output Voltage High VOH
RESET Output Voltage Low
VOL
Test Conditions
Min
Typ
Max
VDD > VTH(MAX) ,
ISOURCE = 800μA, V TH ≥ 3V
V DD −1.5
--
--
VDD > VTH(MAX) ,
ISOURCE = 500μA, V TH ≥ 1.8V
0.8 V DD
--
--
VDD > VTH(MAX) ,
ISOURCE = 200μA, V TH ≥ 1.1V
0.8 V DD
--
--
VDD > VTH(MAX) ,ISINK = 3.5mA,
VTH ≥ 3V
--
--
0.4
VDD > VTH(MAX) ,ISINK = 1.2mA,
VTH ≥ 1.8V
--
--
0.3
VDD > VTH(MAX) ,ISINK = 0.5mA,
VTH ≥ 1.2V
--
--
0.3
0.8 V DD
--
--
0.8 V DD
--
--
V DD −1.5
--
--
1.1V < V DD < VTH(MIN) ,
ISOURCE = 200μA
RESET Output Voltage High VOH
1.8V < V DD < VTH(MIN) ,
ISOURCE = 500μA
3V < V DD < V TH(MIN) ,
ISOURCE = 800μA
Units
V
V
V
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 T A = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
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RT9819
Typical Operating Characteristics
Nch Driver Output Current vs. VDS
Nch Driver Output Current vs. VDS
2.4
60
RT9819A-12
VDD = 1.1V
VDD = 2.8V
50
Output Current (mA)
Output Current (mA)
2
RT9819C-30
1.6
1.2
VDD = 1.0V
0.8
0.4
VDD = 2.5V
40
30
VDD = 2.0V
20
VDD = 1.5V
10
0
0
0
0.3
0.6
0.9
1.2
1.5
0
0.5
1
1.5
VDS (V)
RT9819A-45
Output Voltage (V)
Output Current (mA)
3.5
RT9819A
6
80
VDD = 4.4V
= 4.0V
= 3.5V
= 3.0V
= 2.5V
= 2.0V
= 1.5V
60
40
20
5
4
5.0V
3
2
3.0V
2.9V
1
0
0
0
1
2
3
4
5
0
1
VDS (V)
RT9819A-12
Supply Current IDD (uA)
80°C
4
25°C
3
2
3
4
5
6
Supply Current vs. Input Voltage
4
5
2
Input Voltage (V)
Supply Current vs. Input Voltage
Supply Current (uA)
3
Output Voltage vs. Input Voltage
7
100
6
2.5
VDS (V)
Nch Driver Output Current vs. VDS
120
2
-30°C
1
0
RT9819C-30
80°C
3
25°C
2
-30°C
1
0
0
1
2
3
4
Input Voltage (V)
DS9819-05 August 2007
5
6
0
1
2
3
4
5
6
Input Voltage (V)
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RT9819
Supply Current vs. Input Voltage
4
Power-Down Reset Delay vs. Temperature
15
Power-Down Reset Delay (us)
RT9819A-45
Supply Current (uA)
80°C
3
25°C
-30°C
2
1
0
RT9819A-12
12
9
VDROP = 200mV
VDROP = 150mV
6
VDROP = 250mV
3
0
0
1
2
3
4
5
6
-50
-25
0
Power-Down Reset Delay vs. Temperature
RT9819C-30
40
35
30
25
VDROP = 200mV
20
VDROP = 150mV
15
VDROP = 250mV
10
5
0
100
125
RT9819A-45
40
35
30
VDROP = 200mV
25
VDROP = 150mV
20
15
VDROP = 250mV
10
5
-25
0
25
50
75
100
125
-50
-25
0
Temperature (°C)
50
75
100
125
Nch Driver Sink Current vs. Input Voltage
50
RT9819C-30, VDS = 0.5V
RT9819A-45, VDS = 0.5V
-30°C
Sink Current I SINK (mA)
-30°C
30
25°C
20
25
Temperature (°C)
Nch Driver Sink Current vs. Input Voltage
Sink Current I SINK (mA)
75
0
-50
40
50
Power-Down Reset Delay vs. Temperature
45
Power-Down Reset Delay (us)
Power-Down Reset Delay (us)
45
25
Temperature (°C)
Input Voltage (V)
80°C
10
40
25°C
30
80°C
20
10
0
0
0
0.5
1
1.5
2
Input Voltage (V)
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2.5
3
3.5
0
1
2
3
4
5
Input Voltage (V)
DS9819-05 August 2007
RT9819
Reset Threshold Deviation vs. Temperature
Pch Driver Output Current vs. Input Voltage
25
RT9819
RT9819C-30
VDS = 2.1V
5.0V
5.00
20
4.5V
Output Current (mA)
Reset Threshold Deviation (V)
6.00
4.2V
4.00
3.00
2.2V
2.00
VDS = 1.5V
15
VDS = 1.0V
10
VDS = 0.5V
5
1.2V
1.00
0
-50
-25
0
25
50
75
100
0
125
1
2
Temperature (°C)
(μs)
Power-Up Reset Time-Out (ms)
Power-Up Reset Time-Out (ms)
400
VTH = 2.9V
VTH = 3.0V
200
100
-50
RT9819A
75
VTH = 5.0V
50
VTH = 4.5V
25
-25
0
25
50
75
100
-50
125
-25
160
Nch Driver Output Current (mA)
RT9819
100
10
VTH = 3.0V
1
VTH = 2.9V
VTH = 5.0V
0.01
0.0001
25
50
75
100
125
Nch Driver Output Current vs. VDS
Output Delay Time vs. Load Capacitance
0.1
0
Temperature (°C)
Temperature (°C)
Output Delay Time (ms)
6
0
0
1000
5
Power-Up Reset Time-Out vs. Temperature
100
RT9819C
300
4
Input Voltage (V)
Power-Up Reset Time-Out vs. Temperature
500
3
RT9819G-31
140
120
100
VDD = 6.0V
= 5.5V
= 5.0V
= 4.5V
= 4.0V
= 3.5V
80
60
40
20
0
0.0010
0.0100
0.1000
Load Capacitance (uF)
DS9819-05 August 2007
1.0000
0
1
2
3
4
5
6
VDS (V)
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RT9819
Nch Driver Output Current vs. Input Voltage
RT9819G-31
VDS = 0.5V
-30°C
50
25°C
40
80°C
30
Power Down Reset Time-Out vs. Temperature
Power Down Reset Time-Out (ms)
Nch Driver Output Current (mA)1
60
20
10
RT9819G-31
400
300
200
100
0
0
7
1
2
3
4
5
-50
6
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature (°C)
Output Voltage vs. Input Voltage
Power-Down Reset Time-Out vs. Temperature
Power-Down Reset Time-Out (us)
0
RT9819G-31
6
Output Voltage (V)
500
5
4
3
2
1
30
RT9819G-31
25
20
VDROP = 200mV
VDROP = 150mV
15
10
VDROP = 250mV
5
0
0
0
1
2
3
4
Input Voltage (V)
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5
6
-50
-25
0
25
50
75
100
125
Temperature (°C)
DS9819-05 August 2007
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.
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RT9819
Outline Dimension
H
D
L
C
B
e
A
A1
b
Symbol
Dimensions In Millimeters
Dimensions In Inches
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
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
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RT9819
D
e
H
L
B
C
b1
b
A
A1
e
Symbol
Dimensions In Millimeters
Dimensions In Inches
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
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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RT9819
H
D
L
C
B
e
A
A1
b
Symbol
Dimensions In Millimeters
Dimensions In Inches
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
Richtek Technology Corporation
Headquarter
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
8F, No. 137, Lane 235, Paochiao Road, Hsintien City
Hsinchu, Taiwan, R.O.C.
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
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DS9819-05 August 2007