SGM803B/SGM809B/SGM810B
Low Power Microprocessor
Supervisory Circuit in 3-Pin SOT-23
GENERAL DESCRIPTION
FEATURES
The SGM803B/SGM809B/SGM810B supervisory circuits
● Precision Voltage Monitor: 3V, 3.3V and 5V Options
monitor the power supply voltage in microprocessor
● Superior Upgrade for MAX803/MAX809/MAX810
and digital systems. They provide a reset output during
and ADM803/ADM809/ADM810
power-up, power-down and brownout conditions. On
● Fully Specified over Temperature
power-up, an internal timer holds reset asserted for
● VCC Transient Immunity
240ms. This holds the microprocessor in a reset state
● Low Power Consumption: 300nA (TYP)
until conditions have stabilized. The nRESET output
● Reset Assertion Down to 1V VCC
remains operational with VCC as low as 1V. The
● 150ms Power-On Reset (MIN)
SGM803B and SGM809B provide an active low reset
Open-Drain nRESET Output (SGM803B)
signal (nRESET) while the SGM810B provides an
Push-Pull nRESET Output (SGM809B)
active high signal (RESET) output. The SGM809B/
Push-Pull RESET Output (SGM810B)
SGM810B have push-pull outputs, whereas the
● -40℃ to +125℃ Operating Temperature Range
SGM803B has an open-drain output, which requires an
● Small Packaging
SGM803B Available in SOT-23-3 and SOT-23
external pull-up resistor.
SGM809B Available in SOT-23-3 and SOT-23
Five reset threshold voltage options are available,
SGM810B Available in SOT-23-3 and SOT-23
suitable for monitoring 3V, 3.3V and 5V supply voltages.
The reset comparator features built-in glitch immunity,
making it immune to fast transients on VCC.
The low supply current of typically 300nA makes the
SGM803B/SGM809B/SGM810B
ideal
for
use
in
portable, battery operated equipment. All are specified
over the extended -40℃ to +125℃ temperature range.
APPLICATIONS
Microprocessor Systems
Controllers
Intelligent Instruments
Automotive Systems
Safety Systems
Portable Instruments
TYPICAL APPLICATION
VCC
VCC
RPULL-UP
SGM803B
only
SGM803B/SGM809B
GND
SG Micro Corp
www.sg-micro.com
nRESET
Microprocessor
System
nRESET
GND
AUGUST 2018 – REV. A
SGM803B/SGM809B/SGM810B
Low Power Microprocessor
Supervisory Circuit in 3-Pin SOT-23
PACKAGE/ORDERING INFORMATION
MODEL
SGM803B
SGM809B
SGM810B
RESET
THRESHOLD (V)
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
4.38
4.38
SOT-23-3
SGM803B-MXN3G/TR
M18XX
Tape and Reel, 3000
SOT-23
SGM803B-MXN3LG/TR
M19XX
Tape and Reel, 3000
4.00
SOT-23-3
SGM803B-JXN3G/TR
M1AXX
Tape and Reel, 3000
4.00
SOT-23
SGM803B-JXN3LG/TR
M1BXX
Tape and Reel, 3000
3.08
SOT-23-3
SGM803B-TXN3G/TR
M1CXX
Tape and Reel, 3000
3.08
SOT-23
SGM803B-TXN3LG/TR
M1DXX
Tape and Reel, 3000
2.93
SOT-23-3
SGM803B-SXN3G/TR
M1EXX
Tape and Reel, 3000
2.93
SOT-23
SGM803B-SXN3LG/TR
GZ5XX
Tape and Reel, 3000
2.63
SOT-23-3
SGM803B-RXN3G/TR
M1FXX
Tape and Reel, 3000
2.63
SOT-23
SGM803B-RXN3LG/TR
M20XX
Tape and Reel, 3000
4.38
SOT-23-3
SGM809B-MXN3G/TR
M21XX
Tape and Reel, 3000
4.38
SOT-23
SGM809B-MXN3LG/TR
M22XX
Tape and Reel, 3000
4.00
SOT-23-3
SGM809B-JXN3G/TR
M23XX
Tape and Reel, 3000
4.00
SOT-23
SGM809B-JXN3LG/TR
M24XX
Tape and Reel, 3000
3.08
SOT-23-3
SGM809B-TXN3G/TR
M25XX
Tape and Reel, 3000
3.08
SOT-23
SGM809B-TXN3LG/TR
GZ4XX
Tape and Reel, 3000
2.93
SOT-23-3
SGM809B-SXN3G/TR
GZ0XX
Tape and Reel, 3000
2.93
SOT-23
SGM809B-SXN3LG/TR
GYEXX
Tape and Reel, 3000
2.63
SOT-23-3
SGM809B-RXN3G/TR
GZ2XX
Tape and Reel, 3000
2.63
SOT-23
SGM809B-RXN3LG/TR
GZ1XX
Tape and Reel, 3000
4.38
SOT-23-3
SGM810B-MXN3G/TR
M26XX
Tape and Reel, 3000
4.38
SOT-23
SGM810B-MXN3LG/TR
M27XX
Tape and Reel, 3000
4.00
SOT-23-3
SGM810B-JXN3G/TR
M28XX
Tape and Reel, 3000
4.00
SOT-23
SGM810B-JXN3LG/TR
M29XX
Tape and Reel, 3000
3.08
SOT-23-3
SGM810B-TXN3G/TR
M2AXX
Tape and Reel, 3000
3.08
SOT-23
SGM810B-TXN3LG/TR
M2BXX
Tape and Reel, 3000
2.93
SOT-23-3
SGM810B-SXN3G/TR
M2CXX
Tape and Reel, 3000
2.93
SOT-23
SGM810B-SXN3LG/TR
GYFXX
Tape and Reel, 3000
2.63
SOT-23-3
SGM810B-RXN3G/TR
M2DXX
Tape and Reel, 3000
2.63
SOT-23
SGM810B-RXN3LG/TR
GZ3XX
Tape and Reel, 3000
MARKING INFORMATION
NOTE: XX = Date Code.
YYY X X
Date Code - Month
Date Code - Year
Serial Number
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
SG Micro Corp
www.sg-micro.com
AUGUST 2018
2
SGM803B/SGM809B/SGM810B
ABSOLUTE MAXIMUM RATINGS
VCC ....................................................................... -0.3V to 6V
RESET, nRESET .....................................-0.3V to VCC + 0.3V
Input Current, VCC ......................................................... 20mA
Output Current, RESET, nRESET ................................ 20mA
Rate of Rise, VCC ...................................................... 100V/μs
Power Dissipation, PD @ TA = +25℃
SOT-23-3 ....................................................................... 0.4W
Package Thermal Resistance
SOT-23-3, θJA .......................................................... 250℃/W
Junction Temperature .................................................+150℃
Storage Temperature Range ........................ .-65℃to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
HBM ............................................................................. 4000V
MM ................................................................................. 400V
CDM ............................................................................ 1000V
RECOMMENDED OPERATING CONDITIONS
Operating Temperature Range .................... -40℃ to +125℃
SG Micro Corp
www.sg-micro.com
Low Power Microprocessor
Supervisory Circuit in 3-Pin SOT-23
OVERSTRESS CAUTION
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO recommends that
all integrated circuits be handled with appropriate precautions.
Failure to observe proper handling and installation procedures
can cause damage. 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.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
AUGUST 2018
3
Low Power Microprocessor
Supervisory Circuit in 3-Pin SOT-23
SGM803B/SGM809B/SGM810B
PIN CONFIGURATIONS
(TOP VIEW)
1
GND
SGM803B
SGM809B
SGM810B
nRESET/RESET
3
VCC
2
SOT-23-3/SOT-23
PIN DESCRIPTION
PIN NUMBER
NAME
FUNCTION
SGM803B
SGM809B
SGM810B
GND
1
1
1
Ground.
nRESET
2
2
—
Active Low Reset (SGM803B/SGM809B). nRESET remains low while VCC
is below the reset threshold, and remains low for 240ms (TYP) after VCC
rises above the reset threshold.
RESET
—
—
2
Active High Reset (SGM810B). RESET remains high while VCC is below
the reset threshold, and remains high for 240ms (TYP) after VCC rises
above the reset threshold.
VCC
3
3
3
Power Supply. Power supply voltage that is monitored.
SG Micro Corp
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AUGUST 2018
4
Low Power Microprocessor
Supervisory Circuit in 3-Pin SOT-23
SGM803B/SGM809B/SGM810B
ELECTRICAL CHARACTERISTICS
(VCC = 5V for M/J Models, 3.3V for T/S Models, 3V for R Model, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY
TA = +25℃
Voltage
TA = -40℃ to +125℃
1
5.5
1.25
5.5
420
VCC < 5.5V, SGM8_M/J, TA = +25℃
730
VCC < 5.5V, SGM8_M/J, TA = -40℃ to +125℃
Current
560
300
VCC < 3.6V, SGM8_R/S/T, TA = +25℃
430
590
VCC < 3.6V, SGM8_R/S/T, TA = -40℃ to +125℃
V
nA
nA
RESET VOLTAGE THRESHOLD
SGM8_M
SGM8_J
SGM8_T
SGM8_S
SGM8_R
Hysteresis Voltage Ratio
VCC falling, TA = +25℃
4.247
VCC falling, TA = -40℃ to +125℃
4.217
VCC falling, TA = +25℃
3.883
VCC falling, TA = -40℃ to +125℃
3.859
VCC falling, TA = +25℃
3.001
VCC falling, TA = -40℃ to +125℃
2.966
VCC falling, TA = +25℃
2.860
VCC falling, TA = -40℃ to +125℃
2.841
VCC falling, TA = +25℃
2.571
VCC falling, TA = -40℃ to +125℃
2.525
VCC rising
Reset Active Timeout Period
4.452
4.482
4.00
4.072
4.101
3.08
3.151
3.181
2.93
2.998
3.018
2.63
2.698
2.745
V
V
V
V
V
0.5%
Reset Threshold Temperature Coefficient
VCC to RESET/nRESET Delay
4.38
VCC falling from (VTH + VHYS) × (1 + 5%) to
VTH × (1 - 5%) (1)
TA = +25℃
150
TA = -40℃ to +125℃
110
35
ppm/℃
110
μs
240
370
400
ms
RESET/nRESET OUTPUT VOLTAGE
Low (SGM803B-R/S/T)
Low (SGM809B-R/S/T)
Low (SGM803B-M/J)
Low (SGM809B-M/J)
Low (SGM803B-R/S/T/M/J)
Low (SGM809B-R/S/T/M/J)
VCC = VTH(MIN), ISINK = 1.2mA
0.3
V
VCC = VTH(MIN), ISINK = 3.2mA
0.4
V
VCC > 1V, ISINK = 50μA
0.3
V
High (SGM809B-R/S/T)
VCC > VTH(MAX), ISOURCE = 500μA
0.8 × VCC
V
High (SGM809B-M/J)
VCC > VTH(MAX), ISOURCE = 800μA
VCC - 1.5
V
Low (SGM810B-R/S/T)
VCC = VTH(MAX), ISINK = 1.2mA
Low (SGM810B-M/J)
VCC = VTH(MAX), ISINK = 3.2mA
High (SGM810B-R/S/T/M/J)
1.8V < VCC < VTH(MIN), ISOURCE = 150μA
nRESET Open-Drain Output
Leakage Current (SGM803B)
VCC > VTH, reset de-asserted
0.3
0.4
0.8 × VCC
V
V
V
1
μA
NOTE:
1. VTH stands for reset voltage threshold and VHYS stands for hysteresis voltage.
SG Micro Corp
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AUGUST 2018
5
SGM803B/SGM809B/SGM810B
Low Power Microprocessor
Supervisory Circuit in 3-Pin SOT-23
TYPICAL PERFORMANCE CHARACTERISTICS
Power-Down RESET Delay vs. Temperature
SGM8_M/J
VOD = VTH - VCC
1500
VOD = 10mV
1200
900
VOD = 20mV
600
300
0
VOD = 100mV
-40 -25 -10
Power-Down RESET Delay vs. Temperature
1200
5
VOD = 200mV
Power-Down RESET Delay (μs)
Power-Down RESET Delay (μs)
1800
SGM8_R/S/T
1000
VOD = 10mV
800
VOD = 20mV
600
400
VOD = 100mV
0
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
Power-Up RESET Delay vs. Temperature
SGM8_S
500
Supply Current (nA)
Power-Up RESET Delay (ms)
Supply Current vs. Temperature (No Load)
600
290
280
270
260
250
240
VCC = 5.5V
400
300
VCC = 3.6V
200
100
-40 -25 -10
5
0
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
Normalized RESET Voltage Threshold vs. Temperature
Temperature (℃)
Maximum Transient Duration without Causing a Reset Pulse vs.
RESET Comparator Overdrive
7000
Maximum Transient Duration (μs)
Normalized RESET Threshold
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
VOD = 200mV
200
Temperature (℃)
300
VOD = VTH - VCC
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
SG Micro Corp
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6000
5000
4000
3000
SGM8_M/J
2000
1000
0
SGM8_R/S/T
1
10
100
1000
RESET Comparator Overdrive VTH - VCC (mV)
AUGUST 2018
6
Low Power Microprocessor
Supervisory Circuit in 3-Pin SOT-23
SGM803B/SGM809B/SGM810B
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
RESET Output Voltage vs. Supply Voltage
Supply Voltage
5VP-P
2V/div
RESET Output Voltage
2V/div
SGM809B_R
SGM809B_S
Time (200ms/div)
SG Micro Corp
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AUGUST 2018
7
SGM803B/SGM809B/SGM810B
Low Power Microprocessor
Supervisory Circuit in 3-Pin SOT-23
APPLICATION INFORMATION
Benefits of an Accurate Reset Threshold
In other microprocessor supervisory circuits, tolerances
in supply voltages lead to an overall increase in reset
tolerance levels due to the deterioration of the
microprocessor reset circuit’s power supply. The
possibility of a malfunction during a power failure is
greatly reduced because the SGM803B/SGM809B/
SGM810B series can operate effectively even when
there are large degradations of the supply voltages.
Another advantage of the SGM803B/SGM809B/
SGM810B series is its very accurate internal voltage
reference circuit. These benefits combine to produce
an exceptionally reliable voltage monitor circuit.
Interfacing to Microprocessors with
Multiple Interrupts
In a number of cases, it is necessary to interface many
interrupts from different devices (for example, thermal,
altitude, and velocity sensors). The SGM803B/
SGM809B/SGM810B can easily be integrated into
existing interrupt-handling circuits, as shown in Figure 1,
or can be used as a standalone device.
Interfacing to Other Devices’ Output
The SGM803B/SGM809B/SGM810B series is designed
to integrate with as many devices as possible, therefore,
has a standard output dependent on VCC. This enables
the parts to be used in both 3V and 5V, or any nominal
voltage within the minimum and maximum specifications
for VCC. This design simplifies interfacing this device to
other devices.
Ensuring a Valid Reset Output Down to VCC
= 0V
When VCC falls below 1V, the SGM803B/SGM809B
nRESET no longer sinks current. A high impedance
CMOS logic input connected to nRESET may,
therefore, drift to undetermined logic levels. To
eliminate this problem, a 100kΩ resistor should be
connected from nRESET to ground.
VCC
VCC
SGM809B
nRESET
Priority Encoder
74LS147
Figure 2. Ensuring a Valid Reset Output Down to VCC = 0V
VCC
Preventing the High Voltage Spike
VCC
SGM809B
nRESET
GND
4-Line BCD to
Microprocessor
Other
Sensing
Devices
GND
To prevent the high voltage spike damage or to limit
input VCC current, it is recommended to connect a
resistor R1 (0Ω to 1kΩ) in series to VCC, and one
capacitor C1 (0.1µF to 4.7µF) should be connected
between VCC pin and GND. The schematic is shown in
Figure 3. It must be noted that, the input resistor will
affect output driving capability.
IN
Figure 1. Interfacing to Microprocessors with Multiple
Interrupts
R1
0Ω ~ 1kΩ
VCC
C1
0.1µF ~ 4.7µF
nRESET
OUTPUT
SGM809B
GND
Figure 3. Preventing the High Voltage Spike
SG Micro Corp
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AUGUST 2018
8
SGM803B/SGM809B/SGM810B
Low Power Microprocessor
Supervisory Circuit in 3-Pin SOT-23
DETAILED DESCRIPTIONS
Reset Timing
The reset signal is asserted low for the SGM809B and high for the SGM810B when the power supply voltage falls
below the threshold trip voltage and remains asserted for at least 150ms after the power supply voltage has risen
above the threshold.
Hysteresis Voltage
Hysteresis Voltage
VCC
Threshould
Voltage
0V
150ms (MIN)
nRESET
150ms (MIN)
*
*
*
*
0V
RESET
0V
VCC to RESET/nRESET Delay
VCC to RESET/nRESET Delay
NOTE *: Undefined below minimum operating voltage.
Figure 4. Reset Timing Diagram
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (AUGUST 2018) to REV.A
Changed from product preview to production data ............................................................................................................................................. All
SG Micro Corp
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AUGUST 2018
9
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOT-23
D
b
E1
2.29
E
0.76
0.76
e
e1
0.95
RECOMMENDED LAND PATTERN (Unit: mm)
L
L1
A
A1
c
θ
0.25
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
A
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
2.800
3.000
0.110
0.118
E
1.200
1.400
0.047
0.055
E1
2.250
2.550
0.089
0.100
e
0.950 BSC
0.037 BSC
e1
1.900 BSC
0.075 BSC
L
0.550 REF
0.022 REF
L1
0.300
0.500
0.012
0.020
θ
0°
8°
0°
8°
SG Micro Corp
www.sg-micro.com
TX00031.000
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOT-23-3
1.90
D
b
E1
E
2.59
0.99
e
e1
0.95
0.69
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
θ
A2
c
0.2
Symbol
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
A
1.050
1.250
0.041
0.049
A1
0.000
0.100
0.000
0.004
A2
1.050
1.150
0.041
0.045
b
0.300
0.500
0.012
0.020
c
0.100
0.200
0.004
0.008
D
2.820
3.020
0.111
0.119
E
1.500
1.700
0.059
0.067
E1
2.650
2.950
0.104
0.116
e
0.950 BSC
0.037 BSC
e1
1.900 BSC
0.075 BSC
SG Micro Corp
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L
0.300
0.600
0.012
0.024
θ
0°
8°
0°
8°
TX00032.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
W
P0
Q1
Q2
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
Q3
Q4
B0
Reel Diameter
K0
A0
P1
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel
Diameter
Reel Width
W1
(mm)
A0
(mm)
B0
(mm)
K0
(mm)
P0
(mm)
P1
(mm)
P2
(mm)
W
(mm)
Pin1
Quadrant
SOT-23-3
7″
9.0
3.20
3.30
1.30
4.0
4.0
2.0
8.0
Q3
SOT-23
7″
9.5
3.15
2.77
1.22
4.0
4.0
2.0
8.0
Q3
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TX10000.000
DD0001
Package Type
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Pizza/Carton
7″ (Option)
368
227
224
8
7″
442
410
224
18
SG Micro Corp
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DD0002
Reel Type
TX20000.000
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