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RT9819
Micro-Power Voltage Detectors
General Description
The RT9819 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 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 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.
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 CMOS Push-Pull Output Small SC-70-3, SC-82 and SOT-23-3 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
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)
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
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 up RESET/ RESET RESET/ RESET GND VDD
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RT9819
Pin Configurations
(TOP VIEW)
VDD 3 1 GND 2 RESET/ RESET
GND 4 1 RESET/ RESET
NC 3 2 VDD
RESET/ RESET 4 1 VDD
NC 3 2 GND
1 GND
VDD 3 2 RESET/ RESET
VDD 3 1 RESET/ RESET 2 GND
SC-70-3
SC-82
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 GND RESET RESET VDD Pin Function Ground Active Low Push-Pull Reset Output Active High Push-Pull Reset Output Power Pin
Function Block Diagram
VDD VDD
P MOS VSET Threshold Voltage Setting POR Power On Reset CMP Timer N MOS
RESET/ RESET
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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-70-3/SC-82 --------------------------------------------------------------------------------------------------------- 0.25W SOT-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4W Package Thermal Resistance (Note 4) SC-70-3/SC-82, JA --------------------------------------------------------------------------------------------------- 400C /W SOT-23-3, JA ----------------------------------------------------------------------------------------------------------- 250C /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, TA = 25C, unless otherwise specified)
Parameter Operating V DD (VOUT) Range Supply Current Reset Threshold Threshold Voltage Accuracy Threshold Voltage Hysteresis V DD Drop to Reset Delay RT9819A/E Reset Active Time Out Period RT9819B/F RT9819C/G RT9819D/H
Symbol V DD IDD V TH VTH V HYS tRD
Test Conditions RT9819A/B/C/D RT9819E/F/G/H VT H = 3V , V DD = 4.5V
Min 0.9 1.1 ---1.5 --
Typ --3 1.2 to 5.0 -0.01 VTH 20 0 55 220 450 ----
Max 6 6 8 -+1.5 ---75 297 608 0.4 0.3 0.3
Units V A V % V s ms ms ms ms
Drop = VTH -125mV
---
tRP
VDD 1.02 x VTH
35 143 292
VDD < VTH(MIN) ,ISINK = 3.5mA, VTH 3V RESET Output Voltage Low V OL VDD < VTH(MIN) ,ISINK = 1.2mA, VTH 1.8V VTH(MIN) > VDD > 1V, ISINK = 0.5mA
----
V
To be continued
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Parameter Symbol Test Conditions VDD > VTH(MAX) , ISOURCE = 800A, V TH 3V RESET Output Voltage High VOH VDD > VTH(MAX) , ISOURCE = 500A, V TH 1.8V VDD > VTH(MAX) , ISOURCE = 200A, V TH 1.1V VDD > VTH(MAX) ,ISINK = 3.5mA, VTH 3V RESET Output Voltage Low VOL VDD > VTH(MAX) ,ISINK = 1.2mA, VTH 1.8V VDD > VTH(MAX) ,ISINK = 0.5mA, VTH 1.2V 1.1V < V DD < VTH(MIN) , ISOURCE = 200A RESET Output Voltage High VOH 1.8V < V DD < VTH(MIN) , ISOURCE = 500A 3V < V DD < V TH(MIN) , ISOURCE = 800A Min V DD -1.5 0.8 V DD 0.8 V DD ---0.8 V DD 0.8 V DD V DD -1.5 Typ ---------Max ---0.4 0.3 0.3 ---V V V Units
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.
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Typical Operating Characteristics
Nch Driver Output Current vs. VDS
2.4 2
Nch Driver Output Current vs. VDS
60
RT9819A-12 VDD = 1.1V
RT9819C-30 VDD = 2.8V VDD = 2.5V
50
Output Current (mA)
1.6 1.2
Output Current (mA)
40 30
VDD = 2.0V
20 10 0
VDD = 1.0V
0.8 0.4 0 0 0.3 0.6 0.9 1.2 1.5
VDD = 1.5V
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
RT9819A-45
RT9819A
Output Current (mA)
Output Voltage (V)
80 60 40 20 0 0 1 2 3 4 5
5 4
VDD = 4.4V = 4.0V = 3.5V = 3.0V = 2.5V = 2.0V = 1.5V
5.0V
3 2 1 0 0 1 2 3 4 5 6
2.9V
3.0V
VDS (V)
Input Voltage (V)
Supply Current vs. Input Voltage
6 5
Supply Current vs. Input Voltage
4
RT9819A-12
RT9819C-30 80C 25C
Supply Current IDD (uA)
Supply Current (uA)
80C
3
4
25C
3 2 1 0 0 1 2 3 4 5 6
2
-30C
1
-30C
0 0 1 2 3 4 5 6
Input Voltage (V)
Input Voltage (V)
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Supply Current vs. Input Voltage
4
Power-Down Reset Delay vs. Temperature
15
RT9819A-45 80C
RT9819A-12
Power-Down Reset Delay (us)
Supply Current (uA)
3
12
25C -30C
9
2
VDROP = 200mV VDROP = 150mV
6
1
VDROP = 250mV
3
0 0 1 2 3 4 5 6
0 -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
RT9819C-30
RT9819A-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)
Nch Driver Sink Current vs. Input Voltage
40
Nch Driver Sink Current vs. Input Voltage
50
RT9819C-30, VDS = 0.5V
RT9819A-45, VDS = 0.5V -30C
Sink Current I SINK (mA)
30
Sink Current I SINK (mA)
-30C 25C
40
25C
30
20
80C
20
80C
10
10
0 0 0.5 1 1.5 2 2.5 3 3.5
0 0 1 2 3 4 5
Input Voltage (V)
Input Voltage (V)
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Reset Threshold Deviation vs. Temperature
6.00
Pch Driver Output Current vs. Input Voltage
25
RT9819 5.0V
RT9819C-30 VDS = 2.1V
Reset Threshold Deviation (V)
5.00
20
Output Current (mA)
4.5V
4.00
4.2V
VDS = 1.5V
15
VDS = 1.0V
10
3.00
2.2V
2.00
5
VDS = 0.5V
1.2V
1.00 -50 -25 0 25 50 75 100 125
0 0 1 2 3 4 5 6
Temperature (C)
Input Voltage (V)
Power-Up Reset Time-Out vs. Temperature
500
Power-Up Reset Time-Out vs. Temperature
100
RT9819C
RT9819A
Power-Up Reset Time-Out (ms)
400
(s) Power-Up Reset Time-Out (ms)
75
300
VTH = 2.9V
50
VTH = 5.0V VTH = 4.5V
200
VTH = 3.0V
25
100
0 -50 -25 0 25 50 75 100 125
0 -50 -25 0 25 50 75 100 125
Temperature (C)
Temperature (C)
Output Delay Time vs. Load Capacitance
1000
Nch Driver Output Current vs. VDS
160
RT9819
RT9819G-31
Nch Driver Output Current (mA)
140 120 100 80 60 40 20 0
Output Delay Time (ms)
100
10
VTH = 3.0V
1
VDD = 6.0V = 5.5V = 5.0V = 4.5V = 4.0V = 3.5V
0.1
VTH = 2.9V VTH = 5.0V
0.01 0.0001
0.0010
0.0100
0.1000
1.0000
0
1
2
3
4
5
6
Load Capacitance (uF)
VDS (V)
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RT9819
Nch Driver Output Current vs. Input Voltage
Nch Driver Output Current (mA)1
RT9819G-31 VDS = 0.5V
Power Down Reset Time-Out vs. Temperature
Power Down Reset Time-Out (ms)
500
60 50 40 30 20 10 0
RT9819G-31
400
-30C 25C
300
80C
200
100
0
0
1
2
3
4
5
6
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature (C)
Output Voltage vs. Input Voltage
RT9819G-31
Power-Down Reset Time-Out vs. Temperature
Power-Down Reset Time-Out (us)
30 25 20
7 6
RT9819G-31
Output Voltage (V)
5 4 3 2 1 0 0 1 2 3 4 5 6
VDROP = 200mV
15 10 5 0 -50 -25 0 25 50 75 100 125
VDROP = 150mV
VDROP = 250mV
Input Voltage (V)
Temperature (C)
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Application Information
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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RT9819
Outline Dimension
D
H L
C
B
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
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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