User Programmable Micro-Power Voltage Detectors RT9801A/B micro-p
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RT9801A/B
User Programmable Micro-Power Voltage Detectors
RT9801A/B micro-power voltage detector supervising power supply voltage level microprocessors digital systems. provides user programmable threshold levels with 0.1V step ranging from 1.5V which covers most digital applications. features supply current Selection easily achieved through pins connected GND, floating different threshold voltage settings. versions threshold voltages, 1.5V 2.5V which programmed factory offered customer demands. RT9801A/B performs supervisory function sending reset signal whenever voltage falls below preset threshold level. This reset signal will last whole period before recovering. Reset signal will release after recovered last whole period Reset Active Time-out period. RT9801A/B N-Channel, open-drain output provided SOT-23-6 package.
Features
User Programmable Threshold 1.5V 0.1V Step with Accuracy Supply Current Quick Reset within Built-in Recovery Delay 200ms Functional Supply Voltage 0.9V Small SOT-23-6 Package RoHS Compliant 100% Lead (Pb)-Free
Applications
Computers Controllers Intelligent Instruments Critical Power Monitoring Portable/Battery-Powered Equipment
Configurations
(TOP VIEW)
VSET1 VSET2
Ordering Information
RT9801 Package Type SOT-23-6 Operating Temperature Range Free with Commercial Standard Green (Halogen Free with Commercial Standard) Reset Threshold 2.5V 1.5V
VSET0 RESET
SOT-23-6 Note There pin1 indicator mark SOT-23-6 type, will lower left when reading mark from left right.
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.
Typical Application Circuit
RESET
VSET0
VSET1
RT9801 VSET2 RESET Pull
Marking Information
marking information, contact sales representative directly through RichTek distributor located your area, otherwise visit website detail.
DS9801AB-11 March 2007
RT9801 2.5V this example
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RT9801A/B
Test Circuits
100K RESET Oscilloscopes
RT9801A/B RESET
RT9801A/B
Detection Voltage
Current Consumption
RT9801A/B RESET
100K
RT9801A/B
RESET
VRESET
Dynamic Response
Output Transistor Current
Functional Description
Name VSET0 RESET VSET1 VSET2 Function Threshold Voltage Selection Ground Reset Pulse Output, Negative Pulse Power Threshold Voltage Selection Threshold Voltage Selection
Note Threshold Voltage Setting refer Table.1
Function Block Diagram
Internal Clock VSET0 VSET1 VSET2 Threshold Voltage Setting Power Reset RESET VSET Timer
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DS9801AB-11 March 2007
RT9801A/B
Absolute Maximum Ratings
Terminal Voltage (with Respect GND) -0.3V 6.0V Other Inputs -0.3V VDD+0.3V Input Current, 20mA Continuous Power Dissipation, 25°C SOT-23-6 0.25W Operating Junction Temperature Range -40°C 125°C Storage Temperature Range -65°C 125°C Package Thermal Resistance SOT-23-6, 250°C Lead Temperature (Soldering, 10sec.) 260°C
Electrical Characteristics
(VDD unless otherwise specified)
Parameter Operating Range Supply Current Reset Threshold Threshold Voltage Accuracy Drop Reset Delay Reset Active Timeout Period VSET Input Threshold RESET Output Voltage
Symbol
Test Conditions
-Note1 -200 0.15VDD 0.85VDD
Units
1.5V 3.5V, ISINK 3.5V ISINK 27°C 27°C Drop -125mV Programmable 27°C 27°C VTH, ISINK 3.5mA
-120
Timing Diagram
Drop
VRESET
VRESET
DS9801AB-11 March 2007
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RT9801A/B
Table Conditions Programmable Threshold Voltage Setting
RT9801A RT9801B VSET0 VSET1 VSET2
Note Connected Connected Floating
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DS9801AB-11 March 2007
RT9801A/B
Typical Operating Characteristics
N-Ch Driver Sink Current VRESET
N-Ch Driver Sink Current VRESET
2.2V
Sink Current SINK (mA)
1.7V
Sink Current SINK (mA)
2.0V
1.5V
1.5V 25°C
25°C
VRESET
VRESET
N-Ch Driver Sink Current VRESET
N-Ch Driver Sink Current VRESET
4.0V 3.5V 3.0V
2.8V
Sink Current SINK (mA)
Sink Current SINK (mA)
2.5V
2.0V
2.0V
1.5V
25°C
1.5V
25°C 4.5V
VRESET
VRESET
N-Ch Driver Sink Current VRESET
VRESET
25°C
5.0V 4.5V 3.0V 2.4V 2.0V
4.5V
Sink Current SINK (mA)
4.0V
3.5V 3.0V
VRESET
25°C
2.5V
2.0V 1.5V
VRESET
DS9801AB-11 March 2007
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RT9801A/B
Supply Current Input Voltage
Supply Current Input Voltage
Supply Current (uA)
Supply Current (uA)
25°C
25°C 80°C
80°C
-30°C
-30°C
2.4V
Input Voltage
Input Voltage
Supply Current Input Voltage
Supply Current Input Voltage
80°C
80°C
Supply Current (uA)
25°C
Supply Current (uA)
25°C
-30°C
-30°C
4.5V
Input Voltage
Input Voltage
Supply Current Input Voltage
Reset Threshold Deviation Temperature
Supply Current (uA)
80°C
Threshold Voltage
4.5V
-30°C
25°C
2.5V
Input Voltage
Temperature (°C)
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DS9801AB-11 March 2007
RT9801A/B
N-Ch Driver Sink Current Input Voltage
N-Ch Driver Sink Current Input Voltage
Sink Current SINK (mA)
-30°C
Sink Current SINK (mA)
2.0V VRESET 0.5V
2.5V VRESET 0.5V
-30°C
25°C
25°C
80°C
80°C
Input Voltage
Input Voltage
N-Ch Driver Sink Current Input Voltage
N-Ch Driver Sink Current Input Voltage
VRESET 0.5V
Sink Current SINK (mA)
Sink Current SINK (mA)
4.5V VRESET 0.5V
-30°C
-30°C
25°C
25°C
80°C
80°C
Input Voltage
Input Voltage
N-Ch Driver Sink Current Input Voltage
Reset Active Timeout Period Temperature
-30°C
Reset Active Timeout Period (ms)
Sink Current SINK (mA)
VRESET 0.5V
25°C
2.4V
80°C
4.5V
Input Voltage
Temperature (°C)
DS9801AB-11 March 2007
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RT9801A/B
Drop Reset Delay Temperature
Drop Reset Delay
Drop Reset Delay Temperature
Drop Reset Delay
VDROP 200mV VDROP 150mV
VDROP 200mV
VDROP 150mV
VDROP 250mV
VDROP 250mV
Temperature((°C)
Temperature (°C)
Drop Reset Delay Temperature
Drop Reset Delay
Drop Reset Delay Temperature
Drop Reset Delay
VDROP 200mV
VDROP 150mV
VDROP 200mV VDROP 150mV
VDROP 250mV
VDROP 250mV
Temperature (°C)
Temperature (°C)
Drop Reset Delay Temperature
1000
Output Delay Time Load Capacitance
Output Delay Time (ms)
Drop Reset Delay
VDROP 200mV VDROP 150mV
VDROP 250mV
0.0001 0.001 0.01
25°C
Temperature (°C)
Load Capacitance COUT
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DS9801AB-11 March 2007
RT9801A/B
Outline Dimension
Symbol
Dimensions Millimeters 0.889 0.000 1.397 0.250 2.591 2.692 0.838 0.080 0.300 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610
Dimensions Inches 0.031 0.000 0.055 0.010 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-23-6 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
DS9801AB-11 March 2007
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