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RT9816
Micro-Power Voltage Detectors with Manual Reset
General Description
The RT9816 is a micro-power voltage detector with deglitched manual reset input 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 1.0V to 5V, which covers most digital applications. It features low supply current of 3A. The RT9816 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. To pull reset signal low manually, just pull the manual reset input (MR) below the specified VIL level. RT9816 is provided in SC-82 package.
Features
Internally Fixed Threshold 1.0V 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 800ns Glitch Immunity of Manual Reset Input Low Functional Supply Voltage 0.9V N-Channel Open-Drain Output, Small SC-82 Package RoHS Compliant and 100% Lead (Pb)-Free
Applications
Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery-Powered Equipment
Ordering Information
RT9816 Package Type Y : SC-82 Operating Temperature Range C : Commercial Standard 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. DS9816-03 March 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.
Pin Configurations
(TOP VIEW)
VDD 4 1 GND MR 3 2 RESET/ RESET
SC-82 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.
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RT9816
Typical Application Circuit
VDD up RESET/ RESET 100k Pull Up RT9816 GND RESET/ RESET VDD MR
Functional Pin Description
Pin Name GND RESET RESET
MR
Pin Function Ground Pin Active Low Open-Drain Reset Output Active High Open-Drain Reset Output Manual Reset Power Pin
VDD
Function Block Diagram
VDD
MR RESET/ RESET
VSET Threshold Voltage Setting
CMP
Timer
N MOS GND
POR Power On 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-82 -------------------------------------------------------------------------------------------------------------------- 0.25W Package Thermal Resistance (Note 4) SC-82, JA --------------------------------------------------------------------------------------------------------------- 400C 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 V DD (VOUT) Range Supply Current Reset Threshold MR Input Threshold MR Glitch Rejection Threshold Voltage Accuracy V DD Drop to Reset Delay RT9816A/E Reset Active Time Out Period RT9816B/F RT9816C/G RT9816D/H RESET Output Voltage Low Hysteresis Width
Symbol V DD IDD V TH V IL V IH V TH tRD
Test Conditions
Min 0.9
Typ -3 1.2 to 5.0 --800 -20 0 55 220 450 -0.01VT H
Max 6 8 -0.25V DD --+1.5 --75 297 608 0.4 --
Units V A V V ns % s ms ms ms ms V V
V TH = 3V , VDD = 4.5V TA = 27C TA = 27C TA = 27C, V TH > 1.2V TA = 27C, V TH > 1.2V
---0.7V DD --1.5 ---
TA = 27C Drop = V TH -125mV
tRP
VDD 1.02xVTH
35 143 292
V OL VHYS
3 = V DD < VTH IS INK >3.5mA
---
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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.
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Typical Operating Characteristics
Nch Driver Output Current vs. VDS
2.4
Nch Driver Output Current vs. VDS
60
RT9816A-12 VDD = 1.1V
RT9816C-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
RT9816A-45
RT9816
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
RT9816A-12 80C
RT9816C-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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RT9816
Supply Current vs. Input Voltage
4 3.5
Power-Down Reset Delay vs. Temperature
14
RT9816A-45
RT9816A-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
RT9816C-30
RT9816A-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
RT9816 5.0V
RT9816C-30, VDS = 0.5V -30C 25C
35
Reset Threshold (V)
4.5V
4
Sink Current ISINK (mA)
5
30 25 20
4.2V
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)
RT9816A-45, VDS = 0.5V
RT9816C
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
Power-Up Reset Time-Out (us)
RT9816A
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
RT9816G-31
140 120 100 80 60 40 20 0 0 1 2 3 4 5 6
RT9816G-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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RT9816
Power Down Reset Time-Out vs. Temperature
Power Down Reset Time-Out (ms)
500
Output Voltage vs. Input Voltage
7
RT9816G-31
6
400
RT9816G-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
RT9816G-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 RT9816 will connect to the supply voltage that is being monitored at the IC' s VCC 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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RT9816
Outline Dimension
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
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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