SGM812B [SGMICRO]
Microprocessor Supervisory Circuit with Manual Reset Input;
| 型号： | SGM812B |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Microprocessor Supervisory Circuit with Manual Reset Input |
| 文件： | 总10页 (文件大小：692K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM811B/SGM812B
Microprocessor Supervisory Circuits
with Manual Reset Input
GENERAL DESCRIPTION
FEATURES
The SGM811B and SGM812B are integrated
microprocessor supervisory devices which can be reset
under power-up, power-down or even voltage reduction
brownout conditions. When VCC is as low as 1V, the
reset output can still operate. On the power-on state,
the internal timer maintains a 200ms reset assertion,
which keeps the microprocessor in the reset state until
the condition is stable.
● Superior Upgrade for MAX811/MAX812 and
ADM811/ADM812
● High Accuracy Fixed Detection Options: 3V and
3.3V
● Low Supply Current: < 1μA (TYP)
● 200ms (TYP) Power-on Reset Pulse Width
● Reset Output Options:
Active-Low nRESET Output: SGM811B
Active-High RESET Output: SGM812B
● Manual Reset Input
The SGM811B has an active-low nRESET output,
while the SGM812B has an active-high RESET output.
These devices provide three reset threshold voltage
options for 3V and 3.3V voltage monitoring.
● Reset Valid Down to VCC = 1V
● -40℃ to +125℃ Operating Temperature Range
● Available in a Green SOT-143 Package
The devices also provide a manual reset (nMR)
function. It can reduce damage if the device loses its
control or is locked.
APPLICATIONS
The SGM811B and SGM812B are available in a Green
SOT-143 package. They operates over a junction
temperature range of -40℃ to +125℃.
Computers
Battery-Powered Applications
Portable Equipment
Automotive Equipment
Safety Systems
Intelligent Instruments
Critical μP Power Monitoring
TYPICAL APPLICATION
VCC
VCC
VCC
SGM811B/
SGM812B
Microprocessor
nRESET/
nMR
nRESET/
RESET
GND
RESET
Switch
GND
100kΩ
SG Micro Corp
JUNE2022–REV. A.3
www.sg-micro.com
SGM811B
SGM812B
Microprocessor Supervisory Circuits
with Manual Reset Input
PACKAGE/ORDERING INFORMATION
RESET
THRESHOLD (V)
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
3.08
2.93
2.63
3.08
2.93
2.63
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SOT-143
SGM811B-TXKA4G/TR
SGM811B-SXKA4G/TR
SGM811B-RXKA4G/TR
SGM812B-TXKA4G/TR
SGM812B-SXKA4G/TR
SGM812B-RXKA4G/TR
MNAXX
MNBXX
MNCXX
MN7XX
MN8XX
MN9XX
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
SGM811B
SGM812B
MARKING INFORMATION
NOTE: XX = Date Code.
YYY X X
Date Code - Week
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.
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
VCC....................................................................... -0.3V to 6V
All Other Inputs........................................-0.3V to VCC + 0.3V
Input Current
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.
VCC, nMR ......................................................................20mA
Output Current
nRESET/RESET...........................................................20mA
Package Thermal Resistance
ESD SENSITIVITY CAUTION
SOT-143, θJA............................................................ 337℃/W
Power Dissipation @ TA = +25℃
SOT-143, PD ................................................................0.32W
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
HBM.............................................................................4000V
MM.................................................................................400V
CDM ............................................................................1000V
DISCLAIMER
SG Micro Corp reserves the right to make any change in
RECOMMENDED OPERATING CONDITIONS
Operating Junction Temperature Range......-40℃ to +125℃
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
JUNE 2022
2
SGM811B
SGM812B
Microprocessor Supervisory Circuits
with Manual Reset Input
PIN CONFIGURATION
SGM811B (TOP VIEW)
SGM812B (TOP VIEW)
4
VCC
4
3
VCC
GND
1
2
GND
1
2
nMR
nRESET
3
nMR
RESET
SOT-143
SOT-143
PIN DESCRIPTION
PIN NUMBER
NAME
FUNCTION
SGM811B SGM812B
GND
1
2
1
—
2
Ground.
Active-Low Reset Output Pin. If VCC falls below the reset threshold or nMR is low, nRESET
will keep low. If VCC exceeds the reset threshold, the nRESET will keep low for 200ms (TYP).
nRESET
RESET
Active-Low Reset Output Pin. If the VCC falls below the reset threshold or nMR is low, RESET
will keep high. If the VCC exceeds the reset threshold, RESET will keep high for 200ms (TYP).
—
Manual Reset Input Pin. It is an active-low reset input with an internal pull-up resistor of 59kΩ.
nRESET keeps low when nMR is low. When nMR is high, nRESET becomes high after a
timeout period. The nMR can be driven by a CMOS logic or by a switch shorting to GND. If
not used, leave it open or connect it to VCC.
nMR
VCC
3
4
3
4
Supply Voltage Pin.
SG Micro Corp
www.sg-micro.com
JUNE 2022
3
SGM811B
SGM812B
Microprocessor Supervisory Circuits
with Manual Reset Input
ELECTRICAL CHARACTERISTICS
(VCC = 3.3V for T/S Models, VCC = 3V for R Model, TJ = -40℃ to +125℃, typical values are at TJ = +25℃, unless otherwise
noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
Operating Voltage Range
VCC
1.0
V
VCC = 3.6V
VCC = 5.5V
0.5
0.6
1.0
Supply Current
ISUPPLY
μA
1.4
3.03
3.03
2.88
2.87
2.59
2.58
3.08
3.14
3.15
2.98
2.99
2.67
2.68
TJ = +25℃
T Model
S Model
R Model
TJ = -40℃ to +125℃
TJ = +25℃
2.93
2.63
Reset Threshold
VRST
V
TJ = -40℃ to +125℃
TJ = +25℃
TJ = -40℃ to +125℃
T Model
S Model
R Model
13
13
Reset Threshold Hysteresis
mV
12
Reset Threshold Temperature Coefficient
VCC to Reset Delay
20
TJ = -40℃ to +125℃
ppm/℃
μs
tRD
tRS
VRST - VCC = 100mV
84
Reset Pulse Width
140
300
200
290
ms
Manual Reset
Minimum Pulse Width
Glitch Immunity
ns
ns
ns
kΩ
130
59
Reset Propagation Delay
Pull-Up Resistance
400
81
40
An Input Rising above
The Manual Reset
V
CC > VRST(MAX)
0.7 × VCC
V
Circuit Act on:
An Input Falling below
VCC > VRST(MAX)
0.3 × VCC
nRESET/RESET Output Voltage
Low (SGM811B)
VCC = VRST(MIN), ISINK = 1.2mA
VCC > 1.0V, ISINK = 50μA
0.4
0.3
Low (SGM811B)
High (SGM811B)
VCC > VRST(MAX), ISOURCE = 30μA
VCC = VRST(MAX), ISINK = 1.2mA
1.8V < VCC < VRST(MIN), ISOURCE = 150μA
0.8 × VCC
0.8 × VCC
V
Low (SGM812B)
0.4
High (SGM812B)
SG Micro Corp
www.sg-micro.com
JUNE 2022
4
SGM811B
SGM812B
Microprocessor Supervisory Circuits
with Manual Reset Input
TYPICAL PERFORMANCE CHARACTERISTICS
Power-Down Reset Delay vs. Temperature
VOD = VRST - VCC
Power-Up Reset Delay vs. Temperature
250
200
150
100
50
240
235
230
225
220
215
S Model
VOD = 10mV
VOD = 20mV
VOD = 100mV
VOD = 200mV
0
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
Temperature (℃)
Temperature (℃)
Supply Current vs. Temperature (No Load)
Normalized Reset Voltage Threshold vs. Temperature
1
0.8
0.6
0.4
0.2
0
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
0.988
VCC = 5.5V
VCC = 3.6V
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
Temperature (℃)
Temperature (℃)
Maximum Transient Duration without Causing a Reset Pulse vs.
Reset Comparator Overdrive
Reset Output Voltage vs. Supply Voltage
Supply Voltage
400
SGM811B
350
300
250
200
150
100
50
Reset Output Voltage
SGM811B-R
SGM811B-S
0
Time (200ms/div)
1
10
100
1000
Reset Comparator Overdrive, VRST - VCC (mV)
SG Micro Corp
JUNE 2022
www.sg-micro.com
5
SGM811B
SGM812B
Microprocessor Supervisory Circuits
with Manual Reset Input
APPLICATION INFORMATION
Manual Reset Input
Reset Output
The SGM811B and SGM812B provide a manual reset
(nMR) function that allows users to reset the system
manually. It is an active-low reset input with an internal
pull-up resistor of 59kΩ. When the nMR is low, and for
tRS (200ms, TYP) after nMR returns high, the reset
remains active. The nMR can be driven by a CMOS
logic or by a reset switch shorting to GND. If not used,
leave it open or connect it to the VCC. When the device
is far away from the reset switch or used in a noisy
environment, a 0.1μF capacitor is recommended to
connect between nMR and GND.
To ensure sufficient time for the power supply and
microprocessor to stabilize after power-up, a 200ms
(TYP) reset output will hold by the internal timer after
VCC exceeds the reset threshold voltage. Similarly, a
200ms (TYP) reset output will also exist after the power
supply recover from brownout or interruption that allows
the power supply and microprocessor to have enough
time to reach a steady state (Figure 2).
The SGM811B has an active-low nRESET output,
while the SGM812B has an active-high RESET output.
When VCC is as low as 1V during power-down, the
nRESET of the SGM811B will continue output a low
level. This not only keeps the microprocessor shutdown
when the supply voltage falls, but also prevents the
microprocessor occurring false actions when it powers
up.
Precise Reset Threshold
When the supply voltage drops significantly for the
power supply fault, the SGM811B and SGM812B can
even operate normally, which greatly reduces the
possibility of system failure. In addition, the internal
reference voltage accuracy of the SGM811B and
SGM812B is very high, which provides high reliability of
the devices.
Glitch Immunity
The SGM811B and SGM812B have an internal filter
circuit, which makes them have glitch immunity ability
to bear the fast transient glitches on the power supply.
nRESET Valid to VCC = 0V (SGM811B)
The nRESET of SGM811B will stop sinking current and
become open circuit if VCC is below 1.0V. And if a high
impedance CMOS logic input is connected to the
nRESET, the logic level of the CMOS input is
undetermined. To solve the problem, it is
recommended to use a 100kΩ resistor between
nRESET and GND.
VRST
VCC
tRS
tRS
nRESET
Figure 2. Power Fail nRESET Timing
VCC
Interfacing to Other Devices Output
In order to allow the SGM811B and SGM812B to be
integrated with a variety of devices, it is guaranteed that
the reset output is proportional to the VCC when the
VCC is more than 1V. This allows the device to be used
with any supply voltage between the minimum and
maximum of the VCC, including 3V and 3.3V.
VCC
nRESET
SGM811B
R = 100kΩ
GND
Figure 1. nRESET Valid to VCC = 0V Circuit
SG Micro Corp
www.sg-micro.com
JUNE 2022
6
SGM811B
SGM812B
Microprocessor Supervisory Circuits
with Manual Reset Input
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
JUNE 2022 ‒ REV.A.2 to REV.A.3
Page
Updated General Description section...................................................................................................................................................................1
Updated Application Information section..............................................................................................................................................................6
SEPTEMBER 2021 ‒ REV.A.1 to REV.A.2
Page
Changed Electrical Characteristics ......................................................................................................................................................................4
FEBRUARY 2021 ‒ REV.A to REV.A.1
Page
Changed Electrical Characteristics and Typical Performance Characteristics sections ....................................................................................4, 5
Changes from Original (DECEMBER 2018) to REV.A
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
JUNE 2022
7
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOT-143
1.90
0.95
D
e1
e
E1
E
2.2
1.0
d
b1
b
0.20
0.55
0.95
RECOMMENDED LAND PATTERN (Unit: mm)
L
L1
A
c
A1
A2
θ
0.250
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
1.150
0.100
1.050
0.500
0.900
0.150
3.000
MIN
MAX
0.045
0.004
0.041
0.020
0.035
0.006
0.118
A
A1
A2
b
0.900
0.000
0.900
0.300
0.750
0.080
2.800
0.035
0.000
0.035
0.012
0.030
0.003
0.110
b1
c
D
d
0.200 TYP
0.008 TYP
E
1.200
2.250
1.400
2.550
0.047
0.089
0.055
0.100
E1
e
0.95 TYP
0.55 REF
0.037 TYP
0.022 REF
e1
L
1.800
2.000
0.071
0.079
0.012
0°
L1
θ
0.300
0°
0.500
8°
0.020
8°
SG Micro Corp
www.sg-micro.com
TX00047.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
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 Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
SOT-143
7″
9.5
3.20
2.80
1.30
4.0
4.0
2.0
8.0
Q3
SG Micro Corp
TX10000.000
www.sg-micro.com
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)
Reel Type
Pizza/Carton
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
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