Micro-Power Voltage Detectors RT9818 micro-power voltage detector
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RT9818
Micro-Power Voltage Detectors
RT9818 micro-power voltage detector supervising power supply voltage level microprocessors digital systems. provides internally fixed threshold levels with 0.1V step ranging from 1.2V which covers most digital applications. features supply current RT9818 performs supervisory function sending reset signal whenever voltage falls below preset threshold level. This reset signal will last whole period before recovering. Once recovered upcrossing threshold level, reset signal will released after certain delay time. RT9818 provided SC-82, SC-70-3, SOT-23-3, SOT-23-5 SOT-89 packages.
Features
Internally Fixed Threshold 1.2V 0.1V Step High Accuracy ±1.5% Supply Current External Components Required Quick Reset within Built-in Recovery Delay Include 0ms, 55ms, 220ms, 450ms Options 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 100% Lead (Pb)-Free
Applications
Computers Controllers Intelligent Instruments Critical Power Monitoring Portable/Battery-Powered Equipment
Ordering Information
RT9818 Package Type SC-70-3 SOT-23-3 SOT-23-3 (L-Type) SOT-23-5 SOT-89 SC-82 SC-82 (R-Type) Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard) Threshold Voltage 1.2V 1.3V 4.9V 5.0V Reset Active Timeout Period (RESET) 55ms (RESET) 220ms (RESET) 450ms (RESET) (RESET) 55ms (RESET) 220ms (RESET) 450ms (RESET)
Marking Information
marking information, contact sales representative directly through RichTek distributor located your area, otherwise visit website detail.
Typical Application Circuit
100k Pull RESET/ RESET
RT9818 RESET/ RESET
Note RichTek Pb-free Green products RoHS compliant compatible with current requirements IPC/JEDEC J-STD-020. Suitable SnPb Pb-free soldering processes. 100%matte (Sn) plating.
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RT9818
Configurations
(TOP VIEW)
RESET/ RESET
RESET/ RESET
RESET/ RESET
RESET/ RESET
RESET/ RESET
SC-82
SC-82 (R-Type)
SC-70-3
SOT-23-3
SOT-23-3 (L-Type)
Note There pin1 indicator mark SC-82 type,
will lower left when reading mark from left right. Pin2 SC-82 wider than other pins.
RESET/ RESET
RESET/ RESET
SOT-23-5
SOT-89
Functional Description
Name RESET RESET Function Ground Active Open-Drain Reset Output Active High Open-Drain Reset Output Power
Function Block Diagram
RESET/ RESET VSET Threshold Voltage Setting Power Reset Timer
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Absolute Maximum Ratings
(Note Terminal Voltage (with Respect GND) -0.3V 6.0V Other Inputs -0.3V VDD+0.3V Input Current, IVDD 20mA Power Dissipation, 25°C SC-70 SC-82 0.25W SOT-23-3 0.4W SOT-23-5 0.4W SOT-89 0.55W Package Thermal Resistance (Note SC-70 SC-82, 400°C/W SOT-23-3, 250°C/W SOT-23-5, 250°C/W SOT-89, 180°C/W Lead Temperature (Soldering, 10sec.) 260°C Storage Temperature Range -65°C 125°C Susceptibility (Note (Human Body Mode) (Machine Mode) 200V
Recommended Operating Conditions
(Note
Junction Temperature Range -40°C 125°C Ambient Temperature Range -40°C 85°C
Electrical Characteristics
(VDD unless otherwise specified)
Parameter Operating Range Supply Current Reset Threshold Threshold Voltage Accuracy Drop Reset Delay RT9818A/E Reset Active Time Period RT9818B/F RT9818C/G RT9818D/H
Symbol
Test Conditions
-0.01V
-+1.5
Units
4.5V 27°C 27°C 27°C Drop -125mV
-1.5
RESET Output Voltage (Note Hysteresis Width VHYS
ISINK >3.5mA
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RT9818
Note Stresses listed above "Absolute Maximum Ratings" cause permanent damage device. These stress ratings. Functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods remain possibility affect device reliability. Note Devices sensitive. Handling precaution recommended. Note device guaranteed function outside operating conditions. Note measured natural convection 25°C effective thermal conductivity test board JEDEC 51-3 thermal measurement standard. Note voltage calculated Where pull-up resistor current flowing through pull-up resistor. typical application (R=100k), less than 0.2V.
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RT9818
Typical Operating Characteristics
Driver Output Current
Driver Output Current
RT9818A-12 1.1V
RT9818C-30 2.8V 2.5V
Output Current (mA)
Output Current (mA)
2.0V
1.0V
1.5V
Driver Output Current
Output Voltage Input Voltage
RT9818A-45
RT9818
Output Current (mA)
Output Volgate
4.4V 4.0V 3.5V 3.0V 2.5V 2.0V 1.5V
4.5V
1.2V
Input Volgate
Supply Current Input Voltage
Supply Current Input Voltage
RT9818A-12 80°C
RT9818C-30
Supply Current (uA)
Supply Current (uA)
80°C
25°C
25°C
-30°C
-30°C
Input Voltage
Input Voltage
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RT9818
Supply Current Input Voltage
Power-Down Reset Delay Temperature
RT9818A-45
RT9818A-12
Power-Down Reset Delay (us)
80°C
Supply Current (uA)
25°C
-30°C
VDROP 200mV VDROP 150mV
VDROP 250mV
Input Voltage
Temperature (°C)
Power-Down Reset Delay Temperature
Power-Down Reset Delay Temperature
RT9818C-30
RT9818A-45
Power-Down Reset Delay (us)
Power-Down Reset Delay (us)
VDROP 200mV VDROP 150mV
VDROP 200mV
VDROP 150mV
VDROP 250mV
VDROP 250mV
Temperature (°C)
Temperature (°C)
Reset Threshold Deviation Temperature
Driver Sink Current Input Voltage
RT9818 5.0V
RT9818C-30, 0.5V -30°C 25°C
Reset Threshold
4.5V 4.2V
Sink Current ISINK (mA)
80°C
2.2V
1.2V
Temperature (°C)
Input Voltage(V)
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Driver Sink Current Input Voltage
Power-Up Reset Time-Out Temperature
-30°C
Sink Current ISINK (mA)
Power-Up Reset Time-Out (ms)
RT9818A-45, 0.5V
RT9818C
25°C
2.9V
80°C
3.0V
Input Voltage(V)
Temperature (°C)
Power-Up Reset Time-Out Temperature
Output Delay Time Load Capacitance
1000
RT9818A
RT9818
Power-Up Reset Time-Out (us)
Output Delay Time (ms)
5.0V
1.2V
4.5V
4.5V
0.01 0.0001
0.0010
0.0100
0.1000
1.0000
Temperature (°C)
Load Capacitance (uF)
Driver Output Current
Driver Output Current Input Voltage
Driver Output Current (mA)1
Driver Output Current (mA)1
RT9818G-31
RT9818G-31 0.5V
-30°C 25°C
6.0V 5.5V 5.0V 4.5V 4.0V 3.5V
80°C
Input Voltage
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RT9818
Power Down Reset Time-Out Temperature
Power Down Reset Time-Out (ms)
Output Voltage Input Voltage
RT9818G-31
RT9818G-31
Output Voltage
Temperature (°C)
Input Voltage
Power-Down Reset Time-Out Temperature
Power-Down Reset Time-Out (us)
RT9818G-31
VDROP 200mV
VDROP 150mV
VDROP 250mV
Temperature (°C)
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RT9818
Application Information
Multiple Supplies Mainly, pull-up connected RT9818 will connect supply voltage that being monitored pin. However, some systems open-drain output level-shift from monitored supply reset circuitry powered some other supply. Benefits Highly Accurate Reset Threshold Most supervisor have reset threshold voltages between 1.5% below value nominal supply voltages. This ensures reset will occur within nominal supply, will occur when supply 1.5% below nominal.
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RT9818
Outline Dimension
Symbol
Dimensions Millimeters 0.800 0.000 1.150 0.150 1.800 1.800 1.300 0.080 0.210 0.260 0.460 1.100 0.100 1.350 0.400 2.450 2.250
Dimensions Inches 0.031 0.000 0.045 0.006 0.071 0.071 0.051 0.003 0.008 0.010 0.018 0.044 0.004 0.054 0.016 0.096 0.089
SC-70-3 Surface Mount Package
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Symbol
Dimensions Millimeters 0.800 0.000 1.150 0.150 0.350 1.800 1.800 1.300 0.080 0.200 0.260 0.460 1.100 0.100 1.350 0.400 0.500 2.450 2.200
Dimensions Inches 0.031 0.000 0.045 0.006 0.014 0.071 0.071 0.051 0.003 0.008 0.010 0.018 0.043 0.004 0.053 0.016 0.020 0.096 0.087
SC-82 Surface Mount Package
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Symbol
Dimensions Millimeters 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
Dimensions Inches 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
SOT-23-3 Surface Mount Package
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Symbol
Dimensions Millimeters 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
Dimensions Inches 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
SOT-23-5 Surface Mount Package
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RT9818
Symbol
Dimensions Millimeters 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
Dimensions Inches 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
3-Lead SOT-89 Surface Mount Package
Richtek Technology Corporation
Headquarter Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 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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