概述
数据手册RT9818G-12PY 概述
Micro-Power Voltage Detectors 微功耗电压检测器
RT9818G-12PY 数据手册
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PDF下载RT9818
Micro-Power Voltage Detectors
General Description
Features
z Internally Fixed Threshold 1.2V to 5V in 0.1V Step
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.
z High Accuracy 1.5%
z Low Supply Current 3μA
z No External Components Required
z Quick Reset within 20μs
z Built-in Recovery Delay Include 0ms, 55ms, 220ms,
450ms Options
z Low Functional Supply Voltage 0.9V
z N-Channel Open-Drain Output
z Small SC-82, SC-70-3, SOT-23-3, SOT-23-5, SOT-89
Packages
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Computers
Ordering Information
z Controllers
-
RT9818
Package Type
U3 : SC-70-3
V : SOT-23-3
VL : SOT-23-3 (L-Type)
B : SOT-23-5
X : SOT-89
z Intelligent Instruments
z Critical μP and μC Power Monitoring
z Portable/Battery-Powered Equipment
Marking Information
Y : SC-82
YR : SC-82 (R-Type)
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Typical Application Circuit
Threshold Voltage
12 : 1.2V
13 : 1.3V
:
49 : 4.9V
50 : 5.0V
RT9818
GND
100k
Pull Up
VDD
VDD
μP
Reset Active Timeout Period
A = 0ms (RESET)
B = 55ms (RESET)
C = 220ms (RESET)
D = 450ms (RESET)
E = 0ms (RESET)
RESET/
RESET
RESET/
RESET
F = 55ms (RESET)
G = 220ms (RESET)
H = 450ms (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.
DS9818-05 March 2007
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1
RT9818
Pin Configurations
(TOP VIEW)
RESET/
RESET
VDD
3
VDD
3
GND
NC
3
VDD
NC
3
4
1
4
1
3
1
2
1
2
2
2
1
2
RESET/
RESET
GND
VDD
GND
GND
VDD
GND
RESET/
RESET
RESET/
RESET
RESET/
RESET
SC-82
SC-82 (R-Type)
SC-70-3
SOT-23-3
SOT-23-3 (L-Type)
NC
5
NC
4
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.
1
2
3
1
3
2
VDD GND
RESET/
RESET
VDD GND
RESET/
RESET
SOT-23-5
SOT-89
Functional Pin Description
Pin Name
GND
Pin Function
Ground
RESET
RESET
VDD
Active Low Open-Drain Reset Output
Active High Open-Drain Reset Output
Power Pin
Function Block Diagram
VDD
RESET/
RESET
Timer
CMP
N MOS
VSET
GND
Threshold
Voltage Setting
POR
Power On Reset
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RT9818
Absolute Maximum Ratings (Note 1)
z Terminal Voltage (with Respect to GND)
VDD ------------------------------------------------------------------------------------------------------------------------ −0.3V to 6.0V
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 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 Temperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
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
0.9
--
Typ
Max
6
Units
V
Operating V (V
) Range
V
DD
--
DD
OUT
μA
Supply Current
I
VTH = 3V , V = 4.5V TA = 27°C
3
8
DD
DD
V
Reset Threshold
V
TH
T = 27°C
A
--
1.2 to 5.0
--
Threshold Voltage Accuracy
Drop to Reset Delay
ΔV
T = 27°C
−1.5
--
--
20
+1.5
--
%
TH
A
V
t
Drop = V -125mV
μs
DD
RD
TH
RT9818A/E
--
0
--
RT9818B/F
RT9818C/G
RT9818D/H
35
143
292
--
55
75
297
608
0.4
Reset Active Time
Out Period
t
V
≥ 1.02×V
ms
RP
DD
TH
220
450
--
RESET Output Voltage Low (Note 5) V
3 = V
< V I >3.5mA
TH SINK
V
V
OL
DD
Hysteresis Width
V
0.01VTH
HYS
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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), VOL is less than 0.2V.
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DS9818-05 March 2007
RT9818
Typical Operating Characteristics
Nch Driver Output Current vs. VDS
Nch Driver Output Current vs. VDS
2.4
60
50
40
30
20
10
0
RT9818C-30
RT9818A-12
VDD = 2.8V
VDD = 1.1V
2
VDD = 2.5V
1.6
1.2
VDD = 2.0V
VDD = 1.0V
0.8
VDD = 1.5V
0.4
0
0
0.3
0.6
0.9
1.2
1.5
0
0.5
1
1.5
2
2.5
3
3.5
VDS (V)
VDS (V)
Output Voltage vs. Input Voltage
Nch Driver Output Current vs. VDS
7
6
5
4
3
2
1
0
120
100
80
60
40
20
0
RT9818
RT9818A-45
VDD = 4.4V
= 4.0V
= 3.5V
= 3.0V
= 2.5V
= 2.0V
4.5V
1.2V
= 1.5V
0
1
2
3
4
5
0
1
2
3
4
5
6
VDS (V)
Input Volgate (V)
Supply Current vs. Input Voltage
Supply Current vs. Input Voltage
6
5
4
3
2
1
0
4
3.5
3
RT9818C-30
RT9818A-12
80°C
25°C
80°C
2.5
2
25°C
-30°C
1.5
1
-30°C
0.5
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Input Voltage (V)
Input Voltage (V)
DS9818-05 March 2007
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5
RT9818
Supply Current vs. Input Voltage
Power-Down Reset Delay vs. Temperature
4
3.5
3
14
RT9818A-12
RT9818A-45
12
10
8
80°C
25°C
2.5
2
VDROP = 200mV
-30°C
VDROP = 150mV
VDROP = 250mV
6
1.5
1
4
2
0.5
0
0
0
1
2
3
4
5
6
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature
(°C)
Power-Down Reset Delay vs. Temperature
Power-Down Reset Delay vs. Temperature
45
40
35
30
25
20
15
10
5
45
RT9818C-30
RT9818A-45
40
35
30
25
20
15
10
5
VDROP = 200mV
VDROP = 150mV
VDROP = 250mV
VDROP = 200mV
VDROP = 150mV
VDROP = 250mV
0
0
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
(°C)
Temperature
Temperature
(°C)
Reset Threshold Deviation vs. Temperature
Nch Driver Sink Current vs. Input Voltage
6
40
RT9818
RT9818C-30, VDS = 0.5V
5.0V
35
30
25
20
15
10
5
-30°C
5
4.5V
25°C
4
3
2
1
4.2V
80°C
2.2V
1.2V
0
-50
-25
0
25
50
75
100
125
0
0.5
1
1.5
2
2.5
3
3.5
Input Voltage(V)
(°C)
Temperature
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6
DS9818-05 March 2007
RT9818
Nch Driver Sink Current vs. Input Voltage
Power-Up Reset Time-Out vs. Temperature
50
40
30
20
10
0
500
RT9818A-45, VDS = 0.5V
RT9818C
-30°C
400
300
200
100
0
25°C
VTH = 2.9V
80°C
VTH = 3.0V
0
1
2
3
4
5
-50
-25
0
25
50
75
100
125
Input Voltage(V)
Temperature
(°C)
Power-Up Reset Time-Out vs. Temperature
Output Delay Time vs. Load Capacitance
100
1000
100
10
RT9818
RT9818A
80
60
40
20
0
VTH = 5.0V
VTH = 4.5V
VTH = 1.2V
1
0.1
VTH = 4.5V
0.0010
0.01
0.0001
0.0100
0.1000
1.0000
-50
-25
0
25
50
75
100
125
Load Capacitance (uF)
Temperature
(°C)
Nch Driver Output Current vs. Input Voltage
Nch Driver Output Current vs. VDS
60
160
140
120
100
80
RT9818G-31
RT9818G-31
VDS = 0.5V
-30°C
25°C
50
40
30
20
10
0
VDD = 6.0V
= 5.5V
80°C
= 5.0V
= 4.5V
= 4.0V
= 3.5V
60
40
20
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Input Voltage (V)
VDS (V)
DS9818-05 March 2007
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7
RT9818
Power Down Reset Time-Out vs. Temperature
Output Voltage vs. Input Voltage
500
400
300
200
100
0
7
6
5
4
3
2
1
0
RT9818G-31
RT9818G-31
-50
-25
0
25
50
75
100
125
0
1
2
3
4
5
6
Temperature
(°C)
Input Voltage (V)
Power-Down Reset Time-Out vs. Temperature
30
RT9818G-31
25
20
VDROP = 200mV
VDROP = 150mV
15
10
VDROP = 250mV
5
0
-50
-25
0
25
50
75
100
125
Temperature
(°C)
www.richtek.com
8
DS9818-05 March 2007
RT9818
Application Information
Multiple Supplies
Mainly, the pull-up connected to the RT9818 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.
DS9818-05 March 2007
www.richtek.com
9
RT9818
Outline Dimension
H
D
L
C
B
e
b
A
A1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.800
0.000
1.150
0.150
1.800
1.800
1.100
0.100
1.350
0.400
2.450
2.250
0.031
0.000
0.045
0.006
0.071
0.071
0.044
0.004
0.054
0.016
0.096
0.089
b
C
D
e
1.300
0.051
H
L
0.080
0.210
0.260
0.460
0.003
0.008
0.010
0.018
SC-70-3 Surface Mount Package
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DS9818-05 March 2007
RT9818
D
e
H
L
B
C
A
b1
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.800
0.000
1.150
0.150
0.350
1.800
1.800
1.100
0.100
1.350
0.400
0.500
2.450
2.200
0.031
0.000
0.045
0.006
0.014
0.071
0.071
0.043
0.004
0.053
0.016
0.020
0.096
0.087
b
b1
C
D
e
1.300
0.051
H
L
0.080
0.200
0.260
0.460
0.003
0.008
0.010
0.018
SC-82 Surface Mount Package
DS9818-05 March 2007
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11
RT9818
H
D
L
C
B
e
b
A
A1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
1.803
0.080
0.300
1.295
0.152
1.803
0.508
2.997
3.099
2.007
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.071
0.003
0.012
0.051
0.006
0.071
0.020
0.118
0.122
0.079
0.010
0.024
b
C
D
e
H
L
SOT-23-3 Surface Mount Package
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DS9818-05 March 2007
RT9818
H
D
L
B
C
A
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
0.838
0.080
0.300
1.295
0.152
1.803
0.559
2.997
3.099
1.041
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.033
0.003
0.012
0.051
0.006
0.071
0.022
0.118
0.122
0.041
0.010
0.024
b
C
D
e
H
L
SOT-23-5 Surface Mount Package
DS9818-05 March 2007
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13
RT9818
D
D1
A
B
C
C1
e
e
H
A
b
b
b1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
b
1.397
0.356
2.388
0.406
3.937
0.787
4.394
1.397
1.448
0.356
1.600
0.483
2.591
0.533
4.242
1.194
4.597
1.753
1.549
0.432
0.055
0.014
0.094
0.016
0.155
0.031
0.173
0.055
0.057
0.014
0.063
0.019
0.102
0.021
0.167
0.047
0.181
0.069
0.061
0.017
B
b1
C
C1
D
D1
e
H
3-Lead SOT-89 Surface Mount Package
Richtek Technology Corporation
Headquarter
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
8F, No. 137, Lane 235, Paochiao Road, Hsintien City
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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14
DS9818-05 March 2007
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