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RT9818
Micro-Power Voltage Detectors
General Description
The RT9818 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (P) 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 3A. 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.
Features
Internally Fixed Threshold 1.2V to 5V in 0.1V Step High Accuracy 1.5% Low Supply Current 3A No External Components Required Quick Reset within 20s Built-in Recovery Delay Include 0ms, 55ms, 220ms, 450ms Options Low Functional Supply Voltage 0.9V N-Channel Open-Drain Output Small SC-82, SC-70-3, SOT-23-3, SOT-23-5, SOT-89 Packages RoHS Compliant and 100% Lead (Pb)-Free
Applications
Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery-Powered Equipment
Ordering Information
RT9818 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 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)
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 P RESET/ RESET
RT9818 GND VDD 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.
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Pin Configurations
(TOP VIEW)
RESET/ RESET 4 1 VDD
VDD
VDD 3
GND 4 1 RESET/ RESET
NC 3 2 VDD
NC 3 2 GND
1 GND
VDD 3 2 RESET/ RESET
3 1 RESET/ RESET 2 GND
1 GND
2 RESET/ RESET
SC-82
SC-82 (R-Type)
SC-70-3
SOT-23-3
SOT-23-3 (L-Type)
NC 5 1 2
NC 4 3
Note : There is no pin1 indicator on top mark for SC-82 type,
1 2 3
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.
RESET/ VDD GND RESET
RESET/ VDD RESET
GND
SOT-23-5
SOT-89
Functional Pin Description
Pin Name GND RESET RESET VDD Pin Function Ground Active Low Open-Drain Reset Output Active High Open-Drain Reset Output Power Pin
Function Block Diagram
VDD
RESET/ RESET VSET Threshold Voltage Setting POR Power On Reset CMP Timer N MOS GND
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Absolute Maximum Ratings
(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 = 25C SC-70 / SC-82 ---------------------------------------------------------------------------------------------------------- 0.25W SOT-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4W SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 0.4W SOT-89 ------------------------------------------------------------------------------------------------------------------- 0.55W Package Thermal Resistance (Note 4) SC-70 / SC-82, JA ---------------------------------------------------------------------------------------------------- 400C/W SOT-23-3, JA ----------------------------------------------------------------------------------------------------------- 250C/W SOT-23-5, JA ----------------------------------------------------------------------------------------------------------- 250C/W SOT-89, JA ------------------------------------------------------------------------------------------------------------- 180C/W Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260C Storage Temperature Range ---------------------------------------------------------------------------------------- -65C to 125C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 3)
Junction Temperature Range ---------------------------------------------------------------------------------------- -40C to 125C Ambient Temperature Range ---------------------------------------------------------------------------------------- -40C to 85C
Electrical Characteristics
(VDD = 3V, unless otherwise specified)
Parameter Operating VDD (V OUT ) Range Supply Current Reset Threshold Threshold Voltage Accuracy V DD Drop to Reset Delay RT9818A/E Reset Active Time Out Period RT9818B/F RT9818C/G RT9818D/H
Symbol VDD IDD VTH VTH tRD
Test Conditions
Min 0.9
Typ -3 1.2 to 5.0 -20 0 55 220 450 -0.01V TH
Max 6 8 -+1.5 --75 297 608 0.4
Units V A V % s
VTH = 3V , VDD = 4.5V TA = 27C TA = 27C TA = 27C Drop = V TH -125mV
---1.5 ---
tRP
VDD 1.02xVTH
35 143 292
ms
RESET Output Voltage Low (Note 5) VOL Hysteresis Width VHYS
3 = VDD < V TH ISINK >3.5mA
--
V V
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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. JA is measured in the natural convection at T A = 25C 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=100k), VOL is less than 0.2V.
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Typical Operating Characteristics
Nch Driver Output Current vs. VDS
2.4
Nch Driver Output Current vs. VDS
60
RT9818A-12 VDD = 1.1V
RT9818C-30 VDD = 2.8V VDD = 2.5V
Output Current (mA)
2 1.6 1.2 0.8 0.4 0 0 0.3 0.6 0.9
50
Output Current (mA)
40 30
VDD = 2.0V
20 10 0
VDD = 1.0V
VDD = 1.5V
1.2
1.5
0
0.5
1
1.5
2
2.5
3
3.5
VDS (V)
VDS (V)
Nch Driver Output Current vs. VDS
120 100
Output Voltage vs. Input Voltage
7 6
RT9818A-45
RT9818
Output Current (mA)
Output Volgate (V)
5 4 3
80 60 40 20 0 0 1 2 3 4 5
VDD = 4.4V = 4.0V = 3.5V = 3.0V = 2.5V = 2.0V = 1.5V
4.5V
2 1 0 0 1 2 3 4 5 6
1.2V
VDS (V)
Input Volgate (V)
Supply Current vs. Input Voltage
6 5
Supply Current vs. Input Voltage
4 3.5
RT9818A-12 80C
RT9818C-30
Supply Current (uA)
Supply Current (uA)
3 2.5
80C
4
25C
3 2 1 0 0 1 2 3 4 5 6
25C
2 1.5 1 0.5 0 0 1 2 3 4 5 6
-30C
-30C
Input Voltage (V)
Input Voltage (V)
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Supply Current vs. Input Voltage
4 3.5
Power-Down Reset Delay vs. Temperature
14
RT9818A-45
RT9818A-12
Power-Down Reset Delay (us)
80C
12 10 8 6 4 2 0
Supply Current (uA)
3 2.5 2 1.5 1 0.5 0 0 1 2 3 4
25C
-30C
VDROP = 200mV VDROP = 150mV
VDROP = 250mV
5
6
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature (C)
Power-Down Reset Delay vs. Temperature
45
Power-Down Reset Delay vs. Temperature
45
RT9818C-30
RT9818A-45
Power-Down Reset Delay (us)
35 30 25 20 15 10 5 0 -50 -25 0 25 50 75 100 125
Power-Down Reset Delay (us)
40
40 35 30 25 20 15
VDROP = 200mV VDROP = 150mV
VDROP = 200mV
VDROP = 150mV
VDROP = 250mV
VDROP = 250mV
10 5 0 -50 -25 0 25 50 75 100 125
Temperature (C)
Temperature (C)
Reset Threshold Deviation vs. Temperature
6
Nch Driver Sink Current vs. Input Voltage
40
RT9818 5.0V
RT9818C-30, VDS = 0.5V -30C 25C
35
Reset Threshold (V)
4.5V 4.2V
Sink Current ISINK (mA)
5
30 25 20
4
80C
15 10 5 0
3
2.2V
2
1.2V
1 -50 -25 0 25 50 75 100 125
0
0.5
1
1.5
2
2.5
3
3.5
Temperature (C)
Input Voltage(V)
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Nch Driver Sink Current vs. Input Voltage
50
Power-Up Reset Time-Out vs. Temperature
500
-30C
Sink Current ISINK (mA)
40
Power-Up Reset Time-Out (ms)
RT9818A-45, VDS = 0.5V
RT9818C
400
25C
30
VTH = 2.9V
300
80C
20
200
VTH = 3.0V
10
100
0 0 1 2 3 4 5
0 -50 -25 0 25 50 75 100 125
Input Voltage(V)
Temperature (C)
Power-Up Reset Time-Out vs. Temperature
100
Output Delay Time vs. Load Capacitance
1000
RT9818A
RT9818
Power-Up Reset Time-Out (us)
Output Delay Time (ms)
80
100
60
10
VTH = 5.0V
40
1
VTH = 1.2V
VTH = 4.5V
20
0.1
VTH = 4.5V
0 -50 -25 0 25 50 75 100 125
0.01 0.0001
0.0010
0.0100
0.1000
1.0000
Temperature (C)
Load Capacitance (uF)
Nch Driver Output Current vs. VDS
160
Nch Driver Output Current vs. Input Voltage
60
Nch Driver Output Current (mA)1
Nch Driver Output Current (mA)1
RT9818G-31
140 120 100 80 60 40 20 0 0 1 2 3 4 5 6
RT9818G-31 VDS = 0.5V
50 40 30 20 10 0 0 1 2 3 4
-30C 25C
VDD = 6.0V = 5.5V = 5.0V = 4.5V = 4.0V = 3.5V
80C
5
6
VDS (V)
Input Voltage (V)
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Power Down Reset Time-Out vs. Temperature
Power Down Reset Time-Out (ms)
500
Output Voltage vs. Input Voltage
7
RT9818G-31
6
400
RT9818G-31
Output Voltage (V)
-50 -25 0 25 50 75 100 125
5 4 3 2 1
300
200
100
0
0 0 1 2 3 4 5 6
Temperature (C)
Input Voltage (V)
Power-Down Reset Time-Out vs. Temperature
Power-Down Reset Time-Out (us)
30 25 20
RT9818G-31
VDROP = 200mV
15 10 5 0 -50 -25 0 25 50 75 100 125
VDROP = 150mV
VDROP = 250mV
Temperature (C)
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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 P 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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Outline Dimension
H L C B
D
e
A A1 b
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.800 0.000 1.150 0.150 1.800 1.800 1.300 0.080 0.210 0.260 0.460 Max 1.100 0.100 1.350 0.400 2.450 2.250
Dimensions In Inches Min 0.031 0.000 0.045 0.006 0.071 0.071 0.051 0.003 0.008 0.010 0.018 Max 0.044 0.004 0.054 0.016 0.096 0.089
SC-70-3 Surface Mount Package
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D e H L C B
b
b1
A e A1
Symbol A A1 B b b1 C D e H L
Dimensions In Millimeters Min 0.800 0.000 1.150 0.150 0.350 1.800 1.800 1.300 0.080 0.200 0.260 0.460 Max 1.100 0.100 1.350 0.400 0.500 2.450 2.200
Dimensions In Inches Min 0.031 0.000 0.045 0.006 0.014 0.071 0.071 0.051 0.003 0.008 0.010 0.018 Max 0.043 0.004 0.053 0.016 0.020 0.096 0.087
SC-82 Surface Mount Package
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D
H L
C
B
e
A A1 b
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 0.000 1.397 0.356 2.591 2.692 1.803 0.080 0.300 Max 1.295 0.152 1.803 0.508 2.997 3.099 2.007 0.254 0.610
Dimensions In Inches Min 0.035 0.000 0.055 0.014 0.102 0.106 0.071 0.003 0.012 Max 0.051 0.006 0.071 0.020 0.118 0.122 0.079 0.010 0.024
SOT-23-3 Surface Mount Package
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H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 0.000 1.397 0.356 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.035 0.000 0.055 0.014 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT-23-5 Surface Mount Package
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D D1
A
C
B
C1 e e H A b b
b1
Symbol A b B b1 C C1 D D1 e H
Dimensions In Millimeters Min 1.397 0.356 2.388 0.406 3.937 0.787 4.394 1.397 1.448 0.356 Max 1.600 0.483 2.591 0.533 4.242 1.194 4.597 1.753 1.549 0.432
Dimensions In Inches Min 0.055 0.014 0.094 0.016 0.155 0.031 0.173 0.055 0.057 0.014 Max 0.063 0.019 0.102 0.021 0.167 0.047 0.181 0.069 0.061 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
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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