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RT9801A/B
User Programmable Micro-Power Voltage Detectors
General Description
The RT9801A/B is a micro-power voltage detector supervising the power supply voltage level for microprocessors (P) or digital systems. It provides user programmable threshold levels with 0.1V step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 3A. Selection of VTH is easily achieved through 3 pins connected to GND, VDD or floating for different threshold voltage settings. Two versions of threshold voltages, 1.5V to 4V and 2.5V to 5V, which are programmed in factory are offered by customer demands. The RT9801A/B 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. Reset signal will release after VDD is recovered and last for the whole period of Reset Active Time-out period. RT9801A/B is N-Channel, open-drain output and provided in SOT-23-6 package.
Features
User Programmable Threshold 1.5V to 5V in 0.1V Step with 3% Accuracy Low Supply Current 3A Quick Reset within 20s Built-in Recovery Delay 200ms Low Functional Supply Voltage 0.9V Small SOT-23-6 Package RoHS Compliant and 100% Lead (Pb)-Free
Applications
Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery-Powered Equipment
Pin Configurations
(TOP VIEW)
VSET1 VSET2 VDD 6 1 5 2 4 3
Ordering Information
RT9801 Package Type E : SOT-23-6 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Reset Threshold A : 2.5V to 5V B : 1.5V to 4V
VSET0 GND RESET
SOT-23-6 Note : There is no pin1 indicator on top mark for SOT-23-6 type, and pin 1 will be lower left pin when reading top mark from left to right.
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.
Typical Application Circuit
P VDD GND RESET
VSET0
VSET1
RT9801 GND VSET2 RESET Pull Up VDD
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.
DS9801AB-11 March 2007
RT9801 VTH = 2.5V in this example
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RT9801A/B
Test Circuits
VDD VDD
A
R 100K RESET Oscilloscopes
VDD RT9801A/B GND RESET
V
RT9801A/B GND
VDD
V
Detection Voltage
Current Consumption
VDD P.G RT9801A/B GND RESET
100K CRT CL 6V
VDD
VDD
V
RT9801A/B GND
RESET
A
VRESET
V
Dynamic Response
Output Transistor Current
Functional Pin Description
Pin Name VSET0 GND RESET VDD VSET1 VSET2 Pin Function Threshold Voltage Selection Pin Ground Pin Reset Pulse Output, Negative Pulse Power Pin Threshold Voltage Selection Pin Threshold Voltage Selection Pin
Note : Threshold Voltage Setting refer to the Table.1
Function Block Diagram
VDD Internal Clock VSET0 VSET1 VSET2 Threshold Voltage Setting POR Power On Reset RESET VSET CMP Timer N MOS GND
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RT9801A/B
Absolute Maximum Ratings
Terminal Voltage (with Respect to GND) VDD ------------------------------------------------------------------------------------------------------------------------ -0.3V to 6.0V All Other Inputs -------------------------------------------------------------------------------------------------------- -0.3V to VDD+0.3V Input Current, VDD ----------------------------------------------------------------------------------------------------- 20mA Continuous Power Dissipation, PD @ TA = 25C SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.25W Operating Junction Temperature Range -------------------------------------------------------------------------- -40C to 125C Storage Temperature Range ---------------------------------------------------------------------------------------- -65C to 125C Package Thermal Resistance SOT-23-6, JA ----------------------------------------------------------------------------------------------------------- 250C /W Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260C
Electrical Characteristics
(VDD = 3V, unless otherwise specified)
Parameter Operating VDD Range Supply Current Reset Threshold Threshold Voltage Accuracy VDD Drop to Reset Delay Reset Active Timeout Period VSET Pin Input Threshold RESET Output Voltage
Symbol VDD IDD VTH VTH tRD tRP VIL VIH VOL
Test Conditions
Min 0.9
Typ ---Note1 --200 0.15VDD 0.85VDD 0.4
Max 6 3 3.3 -3 20 280 ----
Units V A V % s ms V V
VDD = 1.5V ~ 3.5V, ISINK = 0 VDD = 3.5V ~ 5V, ISINK = 0 TA = 27C TA = 27C Drop = -125mV VDD 1.02xVTH, Programmable TA = 27C TA = 27C VDD < VTH, ISINK = 3.5mA
-----120 ----
Timing Diagram
VDD VTH
VDD VTH Drop
tRP
VRESET
VRESET tRD
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RT9801A/B
Table 1: Pin Conditions for Programmable Threshold Voltage Setting
RT9801A 5.0 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 RT9801B 4.0 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 VSET0 H H H H H H H H H F F F F F F F F F L L L L L L L L VSET1 H H H F F F L L L H H H F F F L L L H H H F F F L L VSET2 H F L H F L H F L H F L H F L H F L H F L H F L H F
Note : 1. H : Connected to VDD 2. L : Connected to GND 3. F : Floating
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RT9801A/B
Typical Operating Characteristics
N-Ch Driver Sink Current vs. VRESET
7 6
N-Ch Driver Sink Current vs. VRESET
12
VDD = 2.2V
Sink Current I SINK (mA)
VDD = 1.7V
5 4
Sink Current I SINK (mA)
10 8 6 4 2 0
VDD = 2.0V
VDD = 1.5V
3 2 1 0 0 0.5 1 1.5 2 2.5 3
VDD = 1.5V TA = 25C VTH =
0 0.5 1 1.5 2 2.5 3
TA = 25C VTH = 2V
VRESET (V)
VRESET (V)
N-Ch Driver Sink Current vs. VRESET
18 15 12 9 6 3
36
N-Ch Driver Sink Current vs. VRESET
VDD = 4.0V VDD = 3.5V VDD = 3.0V
18
VDD = 2.8V
Sink Current I SINK (mA)
Sink Current I SINK (mA)
30 24
VDD = 2.5V
12
VDD = 2.0V
VDD = 2.0V
6
VDD = 1.5V
0 0 0.5 1 1.5 2
TA = 25C VTH = 3V
2.5 3
VDD = 1.5V
0 0 1 2 3
TA = 25C VTH = 4.5V
4
VRESET (V)
VRESET (V)
N-Ch Driver Sink Current vs. VRESET
40
7
VRESET vs. VDD
TA = 25C
5.0V 4.5V 3.0V 2.4V 2.0V
VDD = 4.5V
6 5
Sink Current I SINK (mA)
32
VDD = 4.0V
24
VDD = 3.5V VDD = 3.0V
VRESET (V)
TA = 25C VTH = 5V
4 3 2 1 0 0.0 1.0 2.0
16
VDD = 2.5V
8
VDD = 2.0V VDD = 1.5V
0 0 1 2 3 4 5
3.0
4.0
5.0
6.0
VRESET (V)
VDD (V)
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RT9801A/B
Supply Current vs. Input Voltage
4
Supply Current vs. Input Voltage
4
Supply Current IDD (uA)
Supply Current IDD (uA)
TA = 25C
3
3
TA = 25C TA = 80C
TA = 80C
2
2
TA = -30C
1
TA = -30C
1
VTH = 2V
0 0 1 2 3 4 5 6
VTH = 2.4V
0 0 2 4 6
Input Voltage VDD (V)
Input Voltage VDD (V)
Supply Current vs. Input Voltage
4
5
Supply Current vs. Input Voltage
TA = 80C
TA = 80C
Supply Current IDD (uA)
3
TA = 25C
Supply Current IDD (uA)
4
TA = 25C
3
2
TA = -30C
2
TA = -30C
1
1
VTH = 3V
0 0 1 2 3 4 5 6
0 0 1 2 3 4
VTH = 4.5V
5 6
Input Voltage VDD (V)
Input Voltage VDD (V)
Supply Current vs. Input Voltage
5
Reset Threshold Deviation vs. Temperature
5.2 4.8
Supply Current IDD (uA)
TA = 80C
VTH =
Threshold Voltage (V)
4
4.4 4 3.6 3.2 2.8
VTH = 4.5V
3
TA = -30C
2
TA = 25C
1
VTH = VTH = 2.5V
VTH = 5V
0 0 1 2 3 4 5 6
2.4 -40 -15 10 35 60 85
Input Voltage VDD (V)
Temperature (C)
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DS9801AB-11 March 2007
RT9801A/B
N-Ch Driver Sink Current vs. Input Voltage
10
N-Ch Driver Sink Current vs. Input Voltage
10
Sink Current I SINK (mA)
8
TA = -30C
6
Sink Current I SINK (mA)
VTH = 2.0V VRESET = 0.5V
8
VTH = 2.5V VRESET = 0.5V
TA = -30C
TA = 25C
6
TA = 25C
4
4
2
2
TA = 80C
TA = 80C
0 0 0.5 1 1.5 2 2.5 3
0 0 0.5 1 1.5 2 2.5 3
Input Voltage VDD (V)
Input Voltage VDD (V)
N-Ch Driver Sink Current vs. Input Voltage
12 10 8 6 4
N-Ch Driver Sink Current vs. Input Voltage
16 14
VTH = 3V VRESET = 0.5V
Sink Current I SINK (mA)
Sink Current I SINK (mA)
VTH = 4.5V VRESET = 0.5V
TA = -30C
TA = -30C
12 10 8 6 4 2 0
TA = 25C
TA = 25C
TA = 80C
2 0 0 0.5 1 1.5 2 2.5 3 3.5
TA = 80C
0
1
2
3
4
5
Input Voltage VDD (V)
Input Voltage VDD (V)
N-Ch Driver Sink Current vs. Input Voltage
18
Reset Active Timeout Period vs. Temperature
350
TA = -30C
Reset Active Timeout Period (ms)
Sink Current I SINK (mA)
15 12
VTH = 5V VRESET = 0.5V
300 250
VTH =
TA = 25C
9 6 3 0 0 1 2 3 4 5 6
VTH = 2.4V
200
VTH =
VTH =
150
TA = 80C
VTH = 4.5V
100 50 -40 -15 10 35 60 85
Input Voltage VDD (V)
Temperature (C)
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RT9801A/B
VDD Drop to Reset Delay vs. Temperature
VDD Drop to Reset Delay ( us ) A
VTH =
4.0
3.0 2.5 2.0 1.5 1.0 0.5 0.0
VDD Drop to Reset Delay vs. Temperature
VTH =
VDD Drop to Reset Delay ( us ) A
3.0
2.0
VDROP = 200mV VDROP = 150mV
VDROP = 200mV
VDROP = 150mV
1.0
VDROP = 250mV
0.0 -40 -15 10 35 60 85
VDROP = 250mV
-40
-15
10
35
60
85
Temperature((C) C)
Temperature ( C) (C)
1.5
VDD Drop to Reset Delay vs. Temperature
VDD Drop to Reset Delay ( us ) A
VTH =
1.5
VDD Drop to Reset Delay vs. Temperature
VTH =
VDD Drop to Reset Delay ( us ) A
1.2
1.2
VDROP = 200mV
0.9
VDROP = 150mV
0.9
VDROP = 200mV VDROP = 150mV
0.6
VDROP = 250mV
0.6
VDROP = 250mV
0.3
0.3
0.0 -40 -15 10 35 60 85
0.0 -40 -15 10 35 60 85
Temperature (C)
Temperature (C)
1.5
VDD Drop to Reset Delay vs. Temperature
VTH =
1000
Output Delay Time vs. Load Capacitance
Output Delay Time t P (ms)
VDD Drop to Reset Delay ( us ) A
1.2
0.9
VDROP = 200mV VDROP = 150mV
100
VTH = VTH =
10
0.6
VTH = VTH =
VDROP = 250mV
0.3
VTH = 3V
0.0 -40 -15 10 35 60 85
1 0.0001 0.001 0.01
TA = 25C
0.1
Temperature (C)
Load Capacitance COUT ( uF )
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RT9801A/B
Outline Dimension
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 0.250 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.031 0.000 0.055 0.010 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-23-6 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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