RS809

Supply Voltage Supervisor with Reset Circuits
1 FEATURES

3 DESCRIPTIONS•

Operating Voltage Range: 1.2V to 5.5V•

Low Power Consumption: 50µA (Max)•

Precision Supply-Voltage Monitor:
2.63V, 2.93V, 3.08V, 4.00V, 4.65V•

Guaranteed 𝐑𝐄𝐒𝐄𝐓 Valid at VCC= 1.2V•

200ms Reset Pulse Width•

Voltage Monitor for Power-Fail or LowBattery Warning••

Operating Temperature Range:-40°C to +125°C
Push-pull, ̅̅̅̅̅̅̅̅̅𝐑𝐄𝐒𝐄𝐓 Output•

Available in Green Package: SOT23

The RS809 microprocessor (µP) supervisory circuits
reduce the complexity and number of components
required to monitor power-supply and battery function
in µP systems. This device significantly improves
system reliability and accuracy compared to separate
ICs or discrete components.
These circuits perform a single function: they assert areset signal whenever the VCC supply voltage declines
below a preset threshold, keeping it asserted for at least
200ms after VCC has risen above the reset threshold.
Reset thresholds suitable for operation with a variety ofsupply voltages are available.
The RS809 have push-pull outputs. The RS809 havean active-low RESET output. The reset comparator isdesigned to ignore fast transients on VCC, and theoutputs are guaranteed to be in the correct logic state
for VCC down to 1.2V.

2 APPLICATIONS•

Computers•

SOC、DSP or Micro controllers•

Embedded Systems•

Industrial Equipment•

Intelligent Instruments•

Critical µP Power Monitoring•

Wireless Communications Systems

Low supply current makes the RS809 ideal for use inportable equipment. The RS809 is available in Green
SOT23 package. It operates over an ambient
temperature range of -40°C to +125°C.

Device Information (1)(1)

PART NUMBER

PACKAGEBODY SIZE (NOM)

RS809

SOT23(3)1.30mm×2.92mm

For all available packages, see the orderable addendum at theend of the data sheet.

4 TYPICAL APPLICATION
RS3005
IN

OUT

Vcc
Vcc

FPGA,ASIC,DSP
RS809 RESETGND

REV A.5

RESET

GND

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RS809
Table of Contents
1 FEATURES .......................................................................................................................................................1
2 APPLICATIONS ................................................................................................................................................1
3 DESCRIPTIONS ................................................................................................................................................1
4 TYPICAL APPLICATION ..................................................................................................................................1
5 Revision History ..............................................................................................................................................3
6 PACKAGE/ORDERING INFORMATION (1) ......................................................................................................4
7 PIN CONFIGURATIONS ...................................................................................................................................5
8 SPECIFICATIONS ............................................................................................................................................6
8.1 Absolute Maximum Ratings (1) ....................................................................................................................6
8.2 ESD Ratings................................................................................................................................................6
8.3 ELECTRICAL CHARACTERISTICS ...........................................................................................................7
8.4TYPICAL OPERATING CHARACTERISTICS .............................................................................................8
9 Function Block Diagram .............................................................................................................................. 10
10 Detailed Description ................................................................................................................................... 1011 Application and Implementation ............................................................................................................... 1111.1 Ensuring a Valid RESET Output Down to VCC=0V ................................................................................ 1111.2 Reset Timing .......................................................................................................................................... 11
12 PACKAGE OUTLINE DIMENSIONS ........................................................................................................... 12
13 TAPE AND REEL INFORMATION .............................................................................................................. 13

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RS8095 Revision History
Note: Page numbers for previous revisions may different from page numbers in the current version.
VersionChange Date

A.1

2021/08/09

A.2

2022/05/09

A.3

2022/05/10

A.4

2022/11/25

A.5

2023/07/24

Change Item
Initial version completed
1. Update PACKAGE MARKING on Page 5@RevA.1
2. Update Operating Temperature Range :-40°C to +125°C
Update TYPICAL OPERATING CHARACTERISTICS
1. Update TYPICAL OPERATING CHARACTERISTICS
2. Update PACKAGE/ORDERING INFORMATION
1. Modify Operating Voltage Range: 1.2V to 5.5V
2. Update ESD Ratings

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RS8096 PACKAGE/ORDERING INFORMATION (1)PRODUCT

RS809

ORDERING
NUMBERTEMPERATURE
RANGE

PACKAGELEAD

PACKAGEMARKING (2/3)

PACKAGE OPTION

RS809-2.63YSF3-40°C ~+125°C

SOT23

809B

Tape and Reel,3000

RS809-2.93YSF3-40°C ~+125°C

SOT23

809C

Tape and Reel,3000

RS809-3.08YSF3-40°C ~+125°C

SOT23

809D

Tape and Reel,3000

RS809-4.00YSF3-40°C ~+125°C

SOT23

809E

Tape and Reel,3000

RS809-4.65YSF3-40°C ~+125°C

SOT23

809G

Tape and Reel,3000

NOTE:(1) This information is the most current data available for the designated devices. This data is subject to change without notice and revisionof this document. For browser-based versions of this data sheet, refer to the right-hand navigation.
(2) There may be additional marking, which relates to the lot trace code information (data code and vendor code), the logo or theenvironmental category on the device.
(3) B, C, D, E, G represents different Reset Thresholds.

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RS809
7 PIN CONFIGURATIONS(TOP VIEW)
GND

1
RS809

RESET

3

VCC

2
SOT23

PIN DESCRIPTION
PIN
NAME

FUNCTION

1

GND

2

̅̅̅̅̅̅̅̅̅
RESET

3

VCC

Ground, reference for all signals.
Active-Low Reset Output remains low while VCC is below the reset threshold, and for at least
200ms after VCC rises above the reset threshold.
Power Supply Voltage that is monitored.

SOT23

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RS8098 SPECIFICATIONS
8.1 Absolute Maximum Ratings (1)over operating free-air temperature range (unless otherwise noted) (1)(2)
MIN

MAX

UNIT

VCC

Supply voltage range

-0.5

6.0

V

VI

Input voltage range (2)

-0.5

6.0

V

Vo

Voltage range applied to any output in the high-impedance or power-off state (2)

-0.5

6.0

V

Vo

Voltage range applied to any output in the high or low state (2)(3)-0.5

VCC+0.5

V

IIK

Input clamp current

VI<0

-20

mA

IOK

Output clamp current

VO<0

-20

mA

IO

Continuous output current

±20

mA

Continuous current through VCC or GND

±20

mA

295

°C/W

θJA

Package thermal impedance (4)TJ

Junction temperature (5)

-65

150

°C

Tstg

Storage temperature

-65

150

°C

TA

Operating temperature

-40

125

°C

(1)

(2)
(3)
(4)
(5)

SOT23

Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stressratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device
reliability.
The input and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
The value of VCC is provided in the Recommended Operating Conditions table.
The package thermal impedance is calculated in accordance with JESD-51.
The maximum power dissipation is a function of TJ(MAX), RθJA, and TA. The maximum allowable power dissipation at any ambient
temperature is PD = (T J(MAX) - TA) / RθJA. All numbers apply for packages soldered directly onto a PCB.

8.2 ESD Ratings
The following ESD information is provided for handling of ESD-sensitive devices in an ESD protected area only.

V(ESD) Electrostatic discharge

VALUE

UNIT

Human-body model (HBM), MIL-STD-883K METHOD 3015.9

±4000

V

Machine model (MM), JESD22-A115C (2010)

±200

V

ESD SENSITIVITY CAUTION
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small parametric changes could cause the device not to meet its
published specifications.

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RS8098.3 ELECTRICAL CHARACTERISTICS
VCC = 2.74V to 5.5V for RS809-2.63; VCC = 3.05V to 5.5V for RS809-2.93; VCC = 3.21V to 5.5V for RS809-3.08; VCC = 4.17V
to 5.5V for RS809-4.00; VCC = 4.84V to 5.5V for RS809-4.65; TA = -40°C to +125°C, unless otherwise noted, typical at 25°C.)
PARAMETERSYMBOLOperating Voltage Range

VCC

Supply Current

ISUPPLY

Reset Threshold

VRT

Reset Threshold
Hysteresis

Reset Pulse Width
Reset Threshold
Temperature Coefficient (1)VCC to ̅̅̅̅̅̅̅̅̅RESET delay̅̅̅̅̅̅̅̅̅ Output voltage
RESET

TEST CONDITIONS

MIN

TYP

1.2

MAX

UNIT

5.5

V
µA

20

50

RS809-2.63

2.50

2.63

2.74

RS809-2.93

2.80

2.93

3.05

RS809-3.08

2.94

3.08

3.21

RS809-4.00

3.82

4.00

4.17

RS809-4.65

4.44

4.65

4.84

RS809-2.63

12RS809-2.93

14RS809-3.08

15

RS809-4.00

20

RS809-4.65

23

tRS

100

tRD

VCC=3.3V, RS809-2.93

High

ISOURCE = 500uA

Low

ISINK = 1.2mA

200

V

mV

460

ms

30

ppm/°C33µs

0.7xVCC
0.4

V(1) This parameter is ensured by design and/or characterization and is not tested in production.

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RS809
8.4 TYPICAL OPERATING CHARACTERISTICS

300

24

250

20

-40℃

Supply Current(µA)

Reset Pulse Width(ms)

NOTE: The graphs and tables provided following this note are a statistical summary based on a limited number of samples
and are provided for informational purposes only.

200
150
100
50

25℃
85℃

16

125℃
12
8
4
0

-40 -25 -10 5 20 35 50 65 80 95 110125

1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

Temperature (℃)

Supply Voltage(V)

50

50
45
40
35
30
25
20
15
10
5
0

VCC=3.3V for RS809-2.93

VCC=3.3V for RS809-2.93
40

Reset Delay(µs)

Transient Duration(µs)

Figure 1. Reset Pulse Width vs Temperature

Figure 2. Supply Voltage vs Supply Current

30
20
10
0

0

200

400

600

800

-40 -25 -10 5 20 35 50 65 80 95 110125

1000 1200

Temperature (℃)

Reset Threshold Overdrive(mV)Figure 4. Reset Delay vs Temperature

Figure 3. Transient Duration vs ResetThreshold Overdrive

3.0
VCC= 3V for RS809-2.93

0.6

RESET Output Voltage(V)RESET Output Voltage(V)

0.7

0.5
0.4
0.3

-40℃

0.2

25℃

0.1

85℃

0.0

125℃

1.0

2.0

3.0

4.0

5.0

6.0

7.0

2.0
1.5
1.0

-40℃
25℃
85℃

0.5

125℃

0.0

8.0

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Source Current(mA)

Sink Current(mA)

Figure 5. RESET Output Voltage vs Sink
Current

VCC= 3V for RS809-2.93

2.5

Figure 6. RESET Output Voltage vs Source
Current

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RS809TYPICAL OPERATING CHARACTERISTICS
NOTE: The graphs and tables provided following this note are a statistical summary based on a limited number of samples
and are provided for informational purposes only.
6.0
VCC= 3.3V for RS809-2.93

3.0

Reset Output Voltage (V)Reset Output Voltage (V)

3.5

2.5
2.0
1.5
-40°C
25°C
85°C
125°C

1.0
0.5
0.0
0.0

1.0

VCC= 5V for RS809-2.93
5.0
4.0
3.0
2.0
1.0
0.0

2.0

3.0

4.0

5.0

0.0

Source Current (mA)

1.0

2.0

3.0

4.0

5.0

Source Current (mA)

Figure 8. Reset Output Voltage vs Source
Current

Figure 7. Reset Output Voltage vs Source
Current
Nomalized Reset Threshold (V)

-40°C
25°C
85°C
125°C

1.006
1.005
1.004
1.003
1.002
1.001
1
0.999
0.998
0.997
0.996

RS809-2.93

5V
VCC
0V
5V

RESET
0V
TA=+25℃ for RS809-2.93-40 -25 -10 5 20 35 50 65 80 95 110125

1s/divTemperature (℃)

Figure 9. Normalized Reset Threshold vs
Temperature

Figure 10. RESET Output Voltage vs Supply
Voltage

3.3V

VCC

2.8V

3.3V

RESET

0V
TA= +25ºC for RS809-2.93

10us/div

Figure 11. RESET Response Time

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RS809
9 Function Block Diagram

RESET
GENERATOR
Vcc

2

RESET

3

1 GND

10 Detailed Description
A microprocessor’s (µP’s) reset input starts the µP in a known state. The RS809 assert reset to prevent codeexecution errors during power-up, power-down or brownout conditions. They assert a reset signal whenever the
VCC supply voltage declines below a preset threshold, keeping it asserted for at least 200ms after VCC has risen
above the reset threshold. The RS809 have a push-pull output stage.

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RS80911 Application and Implementation
Information in the following applications sections is not part of the RUNIC component specification, and RUNIC
does not warrant its accuracy or completeness. RUNIC’s customers are responsible for determining suitabilityof components for their purposes. Customers should validate and test their design implementation to confirm
system functionality.

11.1 Ensuring a Valid RESET Output Down to VCC=0V

̅̅̅̅̅̅̅̅̅ output no longer sinks current, it becomes an open circuit.
When VCC falls down below 1.2V, the RS809 RESET
High-impedance CMOS logic inputs can drift to undetermined voltages if left un-driven. If a pull-down resistor̅̅̅̅̅̅̅̅̅ pin, as shown in Figure 12, any stray charge or leakage currents will be drained to ground,is added to the RESET̅̅̅̅̅̅̅̅̅ low. Resistor value (R1) is not critical. It should be about 100KΩ，large enough not to loadholding RESET̅̅̅̅̅̅̅̅̅ and small enough to pull RESET̅̅̅̅̅̅̅̅̅ to ground.
RESET

RESET

R1

Figure 12. RESET Valid to Ground Circuit

11.2 Reset Timing
The reset signal is asserted low for the RS809 when the power supply voltage falls below the threshold trip
voltage and remains asserted for at least 200ms after the power supply voltage has risen above the threshold.

Vcc

Vcc

Vcc

Figure 13. RESET Timing Diagram

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RS80912 PACKAGE OUTLINE DIMENSIONSSOT23 (3)
D

1.90

b

2.29

E1

E
0.76
0.95

0.76

e
e1

RECOMMENDED LAND PATTERN (Unit: mm)

0.2
A A2

c

θ
L

A1

Dimensions In Millimeters

Dimensions In Inches

Symbol
Min

Max

Min

Max

A (1)

0.900

1.150

0.035

0.045

A1

0.000

0.100

0.000

0.004

A2

0.900

1.050

0.035

0.041

b

0.300

0.500

0.012

0.020

c

0.080

0.150

0.003

0.006

D (1)

2.800

3.000

0.110

0.118

E (1)

1.200

1.400

0.047

0.055

E1

2.250

2.550

0.089

0.100

0.950 (BSC) (2)e0.037 (BSC) (2)

e1

1.800

2.000

0.071

0.079

L

0.300

0.500

0.012

0.020

θ

0°

8°

0°

8°

NOTE:
1. Plastic or metal protrusions of 0.15mm maximum per side are not included.
2. BSC (Basic Spacing between Centers), "Basic" spacing is nominal.
3. This drawing is subject to change without notice.

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RS80913 TAPE AND REEL INFORMATIONREEL DIMENSIONSTAPE DIMENSION

Reel
DiameterReel Width(W1)

DIRECTION OF FEEDNOTE: The picture is only for reference. Please make the object as the standard.

KEY PARAMETER LIST OF TAPE AND REEL
PackageType

Reel
DiameterReel Width
(mm)

A0
(mm)

B0
(mm)

K0
(mm)

P0
(mm)

P1
(mm)

P2
(mm)

W
(mm)

Pin1
Quadrant

SOT23

7’’

9.5

3.15

2.77

1.22

4.0

4.0

2.0

8.0

Q3

NOTE:
1. All dimensions are nominal.
2. Plastic or metal protrusions of 0.15mm maximum per side are not included.

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RS809IMPORTANT NOTICE AND DISCLAIMER
Jiangsu RUNIC Technology Co., Ltd. will accurately and reliably provide technical and reliability data (including
data sheets), design resources (including reference designs), application or other design advice, WEB tools,
safety information and other resources, without warranty of any defect, and will not make any express or implied
warranty, including but not limited to the warranty of merchantability Implied warranty that it is suitable for a
specific purpose or does not infringe the intellectual property rights of any third party.
These resources are intended for skilled developers designing with RUNIC products You will be solely
responsible for: (1) Selecting the appropriate products for your application; (2) Designing, validating and testing
your application; (3) Ensuring your application meets applicable standards and any other safety, security orother requirements; (4) RUNIC and the RUNIC logo are registered trademarks of RUNIC INCORPORATED. All
trademarks are the property of their respective owners; (5) For change details, review the revision history
included in any revised document. The resources are subject to change without notice. Our company will not
be liable for the use of this product and the infringement of patents or third-party intellectual property rights due
to its use.

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