RICHTEK RT9818D

RT9818
Micro-Power Voltage Detectors
General Description
Features
The RT9818 is a micro-power voltage detector
supervising the power supply voltage level for
microprocessors (μP) 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 3μA. The RT9818 performs
supervisory function by sending out a reset signal
whenever the VDD voltage falls below a preset threshold
z
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. RT9818 is provided in SC-82, SC-70-3,
SOT-23-3, SOT-23-5 and SOT-89 packages.
z
Ordering Information
z
RT9818
z
z
z
z
z
z
z
z
Applications
z
Package Type
U3 : SC-70-3
V : SOT-23-3
VL : SOT-23-3 (L-Type)
B : SOT-23-5
X : SOT-89
Y : SC-82
YR : SC-82 (R-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commercial Standard)
Internally Fixed Threshold 1.2V to 5V in 0.1V Step
High Accuracy ±1.5%
Low Supply Current 3μ
μA
No External Components Required
μs
Quick Reset within 20μ
Built-in Recovery Delay Include 0ms, 55ms, 220ms,
450ms Options
Low 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 and 100% Lead (Pb)-Free
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z
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Computers
Controllers
Intelligent Instruments
Critical μP and μC Power Monitoring
Portable/Battery-Powered Equipment
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
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)
100k
Pull Up
RT9818
GND
VDD
VDD
μP
RESET/
RESET
RESET/
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.
DS9818-05 March 2007
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RT9818
Pin Configurations
(TOP VIEW)
GND
NC
RESET/
RESET
NC
VDD
4
3
4
3
3
1
2
1
2
1
2
1
2
1
2
RESET/
RESET
VDD
VDD
GND
GND
RESET/
RESET
RESET/
RESET
GND
GND
RESET/
RESET
SC-82 (R-Type)
SC-82
NC
NC
5
4
1
3
2
RESET/ VDD GND
RESET
SOT-23-5
SC-70-3
VDD
VDD
3
3
SOT-23-3
SOT-23-3 (L-Type)
Note : There is no pin1 indicator on top mark for SC-82 type,
1
2
and pin 1 will be lower left pin when reading top mark from
3
left to right. Pin2 of SC-82 is wider than other pins.
RESET/ VDD
RESET
GND
SOT-89
Functional Pin Description
Pin Name
Pin Function
GND
Ground
RESET
Active Low Open-Drain Reset Output
RESET
Active High Open-Drain Reset Output
VDD
Power Pin
Function Block Diagram
VDD
RESET/
RESET
VSET
CMP
Timer
N MOS
GND
Threshold
Voltage Setting
POR
Power On Reset
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DS9818-05 March 2007
RT9818
Absolute Maximum Ratings
(Note 1)
Terminal Voltage (with Respect to GND)
VDD ------------------------------------------------------------------------------------------------------------------------ −0.3V to 6.0V
z All Other Inputs -------------------------------------------------------------------------------------------------------- −0.3V to VDD+0.3V
z Input Current, IVDD ----------------------------------------------------------------------------------------------------- 20mA
z Power Dissipation, PD @ TA = 25°C
SC-70 / SC-82 ---------------------------------------------------------------------------------------------------------- 0.25W
SOT-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4W
SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 0.4W
SOT-89 ------------------------------------------------------------------------------------------------------------------- 0.55W
z Package Thermal Resistance (Note 4)
SC-70 / SC-82, θJA ---------------------------------------------------------------------------------------------------- 400°C/W
SOT-23-3, θJA ----------------------------------------------------------------------------------------------------------- 250°C/W
SOT-23-5, θJA ----------------------------------------------------------------------------------------------------------- 250°C/W
SOT-89, θJA ------------------------------------------------------------------------------------------------------------- 180°C/W
z Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
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Recommended Operating Conditions
z
z
(Note 3)
Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range ---------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VDD = 3V, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
0.9
--
6
V
Operating VDD (V OUT ) Range
VDD
Supply Current
IDD
VTH = 3V , VDD = 4.5V TA = 27°C
--
3
8
μA
Reset Threshold
VTH
TA = 27°C
--
1.2 to 5.0
--
V
Threshold Voltage Accuracy
ΔVTH
TA = 27°C
−1.5
--
+1.5
%
V DD Drop to Reset Delay
tRD
Drop = V TH -125mV
--
20
--
μs
--
0
--
35
55
75
143
220
297
292
450
608
--
--
0.4
RT9818A/E
Reset Active Time
Out Period
RT9818B/F
RT9818C/G
tRP
VDD ≥ 1.02×VTH
RT9818D/H
RESET Output Voltage Low (Note 5) VOL
Hysteresis Width
DS9818-05 March 2007
VHYS
3 = VDD < V TH ISINK >3.5mA
0.01V TH
ms
V
V
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RT9818
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. θJA is measured in the natural convection at T A = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 5. The voltage VOL can be calculated by VOL = VDD − Ir * R. Where R is the pull-up resistor and Ir is the current flowing
through the pull-up resistor. For typical application (R=100kΩ), VOL is less than 0.2V.
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DS9818-05 March 2007
RT9818
Typical Operating Characteristics
Nch Driver Output Current vs. VDS
Nch Driver Output Current vs. VDS
60
RT9818A-12
VDD = 1.1V
2
1.6
1.2
VDD = 1.0V
0.8
RT9818C-30
VDD = 2.8V
50
Output Current (mA)
Output Current (mA)
2.4
0.4
VDD = 2.5V
40
30
VDD = 2.0V
20
VDD = 1.5V
10
0
0
0
0.3
0.6
0.9
1.2
1.5
0
0.5
1
1.5
7
3.5
RT9818
RT9818A-45
6
Output Volgate (V)
100
Output Current (mA)
3
Output Voltage vs. Input Voltage
Nch Driver Output Current vs. VDS
80
60
VDD = 4.4V
= 4.0V
= 3.5V
= 3.0V
= 2.5V
= 2.0V
= 1.5V
40
20
5
4
3
4.5V
2
1
0
1.2V
0
0
1
2
3
4
5
0
1
VDS (V)
2
3
4
5
6
Input Volgate (V)
Supply Current vs. Input Voltage
6
Supply Current vs. Input Voltage
4
RT9818A-12
RT9818C-30
3.5
5
80°C
Supply Current (uA)
Supply Current (uA)
2.5
VDS (V)
VDS (V)
120
2
4
25°C
3
2
-30°C
1
80°C
3
2.5
25°C
2
-30°C
1.5
1
0.5
0
0
0
1
2
3
4
Input Voltage (V)
DS9818-05 March 2007
5
6
0
1
2
3
4
5
6
Input Voltage (V)
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RT9818
Power-Down Reset Delay vs. Temperature
Supply Current vs. Input Voltage
4
14
Power-Down Reset Delay (us)
RT9818A-45
3.5
Supply Current (uA)
80°C
3
25°C
2.5
-30°C
2
1.5
1
0.5
0
RT9818A-12
12
10
VDROP = 200mV
8
VDROP = 150mV
6
VDROP = 250mV
4
2
0
0
1
2
3
4
5
6
-50
-25
0
Input Voltage (V)
Power-Down Reset Delay (us)
Power-Down Reset Delay (us)
RT9818C-30
35
30
VDROP = 200mV
20
VDROP = 150mV
15
VDROP = 250mV
10
5
0
125
RT9818A-45
40
35
30
25
VDROP = 200mV
VDROP = 150mV
20
15
VDROP = 250mV
10
5
-25
0
25
50
75
100
125
-50
-25
0
Temperature (°C)
RT9818
5.0V
75
100
125
RT9818C-30, VDS = 0.5V
Sink Current ISINK (mA)
35
4.5V
4
50
Nch Driver Sink Current vs. Input Voltage
40
5
25
Temperature (°C)
Reset Threshold Deviation vs. Temperature
Reset Threshold (V)
100
0
-50
6
75
Power-Down Reset Delay vs. Temperature
45
40
25
50
Temperature (°C)
Power-Down Reset Delay vs. Temperature
45
25
4.2V
3
2.2V
2
-30°C
30
25°C
25
20
80°C
15
10
5
1.2V
0
1
-50
-25
0
25
50
75
Temperature (°C)
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100
125
0
0.5
1
1.5
2
2.5
3
3.5
Input Voltage(V)
DS9818-05 March 2007
RT9818
Power-Up Reset Time-Out vs. Temperature
Nch Driver Sink Current vs. Input Voltage
50
500
-30°C
Sink Current ISINK (mA)
RT9818C
Power-Up Reset Time-Out (ms)
RT9818A-45, VDS = 0.5V
40
25°C
30
80°C
20
10
400
VTH = 2.9V
300
VTH = 3.0V
200
100
0
0
0
1
2
3
4
5
-50
-25
0
25
Input Voltage(V)
1000
Output Delay Time (ms)
RT9818A
Power-Up Reset Time-Out (us)
100
125
Output Delay Time vs. Load Capacitance
Power-Up Reset Time-Out vs. Temperature
80
60
VTH = 5.0V
VTH = 4.5V
20
RT9818
100
10
VTH = 1.2V
1
0.1
VTH = 4.5V
0
-50
-25
0
25
50
75
100
125
0.01
0.0001
0.0010
60
Nch Driver Output Current (mA)1
RT9818G-31
140
120
100
VDD = 6.0V
= 5.5V
= 5.0V
= 4.5V
= 4.0V
= 3.5V
80
60
40
0.1000
1.0000
Nch Driver Output Current vs. Input Voltage
Nch Driver Output Current vs. VDS
160
0.0100
Load Capacitance (uF)
Temperature (°C)
Nch Driver Output Current (mA)1
75
Temperature (°C)
100
40
50
20
RT9818G-31
VDS = 0.5V
-30°C
50
25°C
40
80°C
30
20
10
0
0
0
1
2
3
VDS (V)
DS9818-05 March 2007
4
5
6
0
1
2
3
4
5
6
Input Voltage (V)
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RT9818
Output Voltage vs. Input Voltage
7
RT9818G-31
RT9818G-31
6
400
Output Voltage (V)
Power Down Reset Time-Out (ms)
Power Down Reset Time-Out vs. Temperature
500
300
200
5
4
3
2
100
1
0
0
-50
-25
0
25
50
75
100
125
Temperature (°C)
0
1
2
3
4
5
6
Input Voltage (V)
Power-Down Reset Time-Out (us)
Power-Down Reset Time-Out vs. Temperature
30
RT9818G-31
25
20
VDROP = 200mV
VDROP = 150mV
15
10
VDROP = 250mV
5
0
-50
-25
0
25
50
75
100
125
Temperature (°C)
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DS9818-05 March 2007
RT9818
Application Information
Multiple Supplies
Mainly, the pull-up connected to the RT9818 will connect to the supply voltage that is being monitored at the IC’ s VDD
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 μP 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.
DS9818-05 March 2007
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RT9818
Outline Dimension
H
D
L
C
B
e
A
A1
b
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.800
1.100
0.031
0.044
A1
0.000
0.100
0.000
0.004
B
1.150
1.350
0.045
0.054
b
0.150
0.400
0.006
0.016
C
1.800
2.450
0.071
0.096
D
1.800
2.250
0.071
0.089
e
1.300
0.051
H
0.080
0.260
0.003
0.010
L
0.210
0.460
0.008
0.018
SC-70-3 Surface Mount Package
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DS9818-05 March 2007
RT9818
D
e
H
L
B
C
b1
b
A
A1
e
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.800
1.100
0.031
0.043
A1
0.000
0.100
0.000
0.004
B
1.150
1.350
0.045
0.053
b
0.150
0.400
0.006
0.016
b1
0.350
0.500
0.014
0.020
C
1.800
2.450
0.071
0.096
D
1.800
2.200
0.071
0.087
e
1.300
0.051
H
0.080
0.260
0.003
0.010
L
0.200
0.460
0.008
0.018
SC-82 Surface Mount Package
DS9818-05 March 2007
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RT9818
H
D
L
C
B
e
A
A1
b
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.889
1.295
0.035
0.051
A1
0.000
0.152
0.000
0.006
B
1.397
1.803
0.055
0.071
b
0.356
0.508
0.014
0.020
C
2.591
2.997
0.102
0.118
D
2.692
3.099
0.106
0.122
e
1.803
2.007
0.071
0.079
H
0.080
0.254
0.003
0.010
L
0.300
0.610
0.012
0.024
SOT-23-3 Surface Mount Package
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DS9818-05 March 2007
RT9818
H
D
L
B
C
b
A
A1
e
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.889
1.295
0.035
0.051
A1
0.000
0.152
0.000
0.006
B
1.397
1.803
0.055
0.071
b
0.356
0.559
0.014
0.022
C
2.591
2.997
0.102
0.118
D
2.692
3.099
0.106
0.122
e
0.838
1.041
0.033
0.041
H
0.080
0.254
0.003
0.010
L
0.300
0.610
0.012
0.024
SOT-23-5 Surface Mount Package
DS9818-05 March 2007
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RT9818
D
D1
A
B
C
C1
e
e
H
A
b
Symbol
b1
b
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
1.397
1.600
0.055
0.063
b
0.356
0.483
0.014
0.019
B
2.388
2.591
0.094
0.102
b1
0.406
0.533
0.016
0.021
C
3.937
4.242
0.155
0.167
C1
0.787
1.194
0.031
0.047
D
4.394
4.597
0.173
0.181
D1
1.397
1.753
0.055
0.069
e
1.448
1.549
0.057
0.061
H
0.356
0.432
0.014
0.017
3-Lead SOT-89 Surface Mount Package
Richtek Technology Corporation
Richtek Technology Corporation
Headquarter
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
8F, No. 137, Lane 235, Paochiao Road, Hsintien City
Hsinchu, Taiwan, R.O.C.
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
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DS9818-05 March 2007