SGM811/SGM812
Microprocessor Supervisory
with Manual Reset Input
GENERAL DESCRIPTION
FEATURES
The SGM811/SGM812 supervisory circuits monitor the
● Superior Upgrade for MAX811/MAX812 and
power supply voltage in microprocessor and digital
ADM811/ADM812
systems. The SGM811/SGM812 is designed to monitor
● Specified Over Temperature
seven different voltages; these voltages have been
● Low Power Consumption (13μA TYP)
selected for the effective monitoring of 1.8V, 2.5V, 3V,
● Precision Voltage Monitor: 1.8V, 2.5V, 3V, 3.3V
3.3V and 5V supply voltage levels.
and 5V Options
● Reset Assertion Down to 1V VCC
They provide a reset output during power-up, power-
● 150ms Min Power-On Reset
down and brownout conditions. On power-up, an internal
Logic Low RESET Output (SGM811)
timer holds reset asserted for 240ms. This holds the
Logic High RESET Output (SGM812)
microprocessor in a reset state until conditions have
● Manual Reset Input
stabilized. The RESET output remains operational with
● Green SOT-143 and SOT-23-5 Packages
VCC as low as 1V. The SGM811 provides an active low
reset signal ( RESET ) while the SGM812 provides an
PIN CONFIGURATIONS (TOP VIEW)
active high signal (RESET) output.
SOT-143
GND
1
4
VCC
3
MR
5
VCC
4
MR
The SGM811/SGM812 has a manual reset input. The
manual reset function is very useful, especially if the
circuit in which the SGM811/SGM812 is operating enters
2
RESET/RESET
into a state that can only be detected by the user.
SOT-23-5
Allowing the user to reset a system manually can reduce
the damage or danger that could otherwise be caused by
GND
1
an out-of-control or locked system. The devices come in
NC
2
RESET/RESET
3
SOT-143 and SOT-23-5 packages.
APPLICATIONS
Microprocessor Systems
Controllers
TYPICAL OPERATION CIRCUIT
VCC
Intelligent Instruments
SGM811
Automotive Systems
Safety Systems
Portable Instruments
SG Micro Corp
www.sg-micro.com
VCC
MICROPROCESSOR
SYSTEM
RESET
MR
RESET
GND
GND
100kΩ
REV. B. 4
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
PACKAGE/ORDERING INFORMATION
ORDERING
NUMBER
RESET
THRESHOLD
(V)
PECKAGE
TYPE
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
PACKING
OPTION
SGM811-LXN5/TR
4.63
SOT-23-5
-40℃ to +125℃
811L
Tape and Reel, 3000
SGM811-MXN5/TR
4.38
SOT-23-5
-40℃ to +125℃
811M
Tape and Reel, 3000
SGM811-JXN5/TR
4.00
SOT-23-5
-40℃ to +125℃
811J
Tape and Reel, 3000
SGM811-TXN5/TR
3.08
SOT-23-5
-40℃ to +125℃
811T
Tape and Reel, 3000
SGM811-SXN5/TR
2.93
SOT-23-5
-40℃ to +125℃
811S
Tape and Reel, 3000
SGM811-RXN5/TR
2.63
SOT-23-5
-40℃ to +125℃
811R
Tape and Reel, 3000
SGM811-ZXN5/TR
2.32
SOT-23-5
-40℃ to +125℃
811Z
Tape and Reel, 3000
SGM811-LXKA4/TR
4.63
SOT-143
-40℃ to +125℃
811L
Tape and Reel, 3000
SGM811-MXKA4/TR
4.38
SOT-143
-40℃ to +125℃
811M
Tape and Reel, 3000
SGM811-JXKA4/TR
4.00
SOT-143
-40℃ to +125℃
811J
Tape and Reel, 3000
SGM811-TXKA4/TR
3.08
SOT-143
-40℃ to +125℃
811T
Tape and Reel, 3000
SGM811-SXKA4/TR
2.93
SOT-143
-40℃ to +125℃
811S
Tape and Reel, 3000
SGM811-RXKA4/TR
2.63
SOT-143
-40℃ to +125℃
811R
Tape and Reel, 3000
-40℃ to +125℃
811Z
Tape and Reel, 3000
Tape and Reel, 3000
SGM811-ZXKA4/TR
2.32
SOT-143
SGM811-XXKA4/TR
1.63
SOT-143
-40℃
TO +125℃
811X
SGM812-LXN5/TR
4.63
SOT-23-5
-40℃ to +125℃
812L
Tape and Reel, 3000
SGM812-M XN5/TR
4.38
SOT-23-5
-40℃ to +125℃
812M
Tape and Reel, 3000
SGM812-JXN5/TR
4.00
SOT-23-5
-40℃ to +125℃
812J
Tape and Reel, 3000
SGM812-TXN5/TR
3.08
SOT-23-5
-40℃ to +125℃
812T
Tape and Reel, 3000
SGM812-SXN5/TR
2.93
SOT-23-5
-40℃ to +125℃
812S
Tape and Reel, 3000
SGM812-RXN5/TR
2.63
SOT-23-5
-40℃ to +125℃
812R
Tape and Reel, 3000
SGM812-ZXN5/TR
2.32
SOT-23-5
-40℃ to +125℃
812Z
Tape and Reel, 3000
SGM812-LXKA4/TR
4.63
SOT-143
-40℃ to +125℃
812L
Tape and Reel, 3000
SGM812-MXKA4/TR
4.38
SOT-143
-40℃ to +125℃
812M
Tape and Reel, 3000
SGM812-JXKA4/TR
4.00
SOT-143
-40℃ to +125℃
812J
Tape and Reel, 3000
SGM812-TXKA4/TR
3.08
SOT-143
-40℃ to +125℃
812T
Tape and Reel, 3000
SGM812-SXKA4/TR
2.93
SOT-143
-40℃ to +125℃
812S
Tape and Reel, 3000
SGM812-RXKA4/TR
2.63
SOT-143
-40℃ to +125℃
812R
Tape and Reel, 3000
SGM812-ZXKA4/TR
2.32
SOT-143
-40℃ to +125℃
812Z
Tape and Reel, 3000
SG Micro Corp
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2
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
ELECTRICAL CHARACTERISTICS
(VCC TYP = 5V for L/M/J Models, 3.3V for T/S Models, 3V for R Models, 2.5V for Z Models, 1.8V for X Models; unless otherwise
noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY
Voltage
TA = 0℃ to +70℃
1.0
5.5
V
TA = -40℃ to +125℃
1.2
5.5
V
30
μA
50
μA
25
μA
45
μA
4.723
V
4.86
V
4.38
4.468
V
4.56
V
4.00
4.08
V
4.2
V
3.08
3.157
V
3.23
V
2.93
3.003
V
3.08
V
2.696
V
2.76
V
2.378
V
2.42
V
1.671
V
1.71
V
VCC < 5.5V, SGM81_L/M/J, TA = +25℃
17
VCC < 5.5V, SGM81_L/M/J, TA = -40℃ to +125℃
Current
VCC < 3.6V, SGM81_R/S/T/Z/X, TA = +25℃
13
VCC < 3.6V, SGM81_R/S/T/Z/X, TA = -40℃ to +125℃
RESET VOLTAGE THRESHOLD
SGM81_L
SGM81_M
SGM81_J
TA = +25℃
4.537
TA = -40℃ to +125℃
4.40
TA = +25℃
4.292
TA = -40℃ to +125℃
4.16
TA = +25℃
3.92
TA = -40℃ to +125℃
TA = +25℃
SGM81_T
SGM81_S
SGM81_R
SGM81_Z
SGM811X
3.8
3.003
TA = -40℃ to +125℃
2.92
TA = +25℃
2.857
TA = -40℃ to +125℃
2.78
TA = +25℃
2.564
TA = -40℃ to +125℃
2.50
TA = +25℃
2.262
TA = -40℃ to +125℃
2.22
TA = +25℃
1.589
TA = -40℃ to +125℃
1.55
Reset Threshold Temperature Coefficient
VCC to RESET/ RESET Delay
Reset Active Timeout Period
4.63
2.63
2.32
1.63
30
VCC = VTH to (VTH - 100mV)
ppm/°C
20
TA = -40℃ to +85℃
150
TA = -40℃ to +125℃
100
240
μs
560
ms
840
ms
MANUAL RESET
Minimum Pulse Width
10
μs
Glitch Immunity
100
ns
RESET/ RESET Propagation Delay
0.5
μs
1
MΩ
Pull-Up Resistance
The Manual Reset Circuit Will Act On:
An Input Rising Above
VCC > VTH(MAX), SGM81_L/M/J
An Input Falling Below
VCC > VTH(MAX), SGM81_L/M/J
An Input Rising Above
VCC > VTH(MAX), SGM81_R/S/T/Z/X
An Input Falling Below
VCC > VTH(MAX), SGM81_R/S/T/Z/X
SG Micro Corp
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2.3
V
0.8
V
0.25 × VCC
V
0.7 × VCC
V
3
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
ELECTRICAL CHARACTERISTICS
(VCC TYP = 5V for L/M/J Models, 3.3V for T/S Models, 3V for R Models, 2.5V for Z Models, 1.8V for X Models; unless otherwise
noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RESET/ RESET OUTPUT VOLTAGE
Low (SGM811R/S/T/Z/X)
VCC = VTH(MIN), ISINK = 1.2mA
0.3
V
Low (SGM811L/M/J)
VCC = VTH(MIN), ISINK = 3.2mA
0.4
V
0.3
V
Low (SGM811R/S/T/Z/X/L/M/J)
VCC > 1.0V, ISINK = 50μA
High (SGM811R/S/T/Z/X)
VCC > VTH(MAX), ISOURCE = 500μA
0.8 × VCC
V
High (SGM811L/M/J)
VCC > VTH(MAX), ISOURCE = 800μA
VCC - 1.5
V
Low (SGM812R/S/T/Z/X)
VCC = VTH(MAX), ISINK = 1.2mA
0.3
V
Low (SGM812L/M/J)
VCC = VTH(MAX), ISINK = 3.2mA
0.4
V
High (SGM812 R/S/T/Z/X/L/M/J)
1.8 V < VCC < VTH(MIN), ISOURCE = 150μA
SG Micro Corp
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0.8 × VCC
V
4
SGM811/812
Microprocessor Supervisory
with Manual Reset Input
ABSOLUTE MAXIMUM RATINGS
(Typical values are at TA = +25°C, unless otherwise noted.)
Terminal Voltage (With Respect to Ground)
VCC.............................................................................-0.3V to 6V
All Other Inputs.............................................-0.3V to VCC + 0.3V
Input Current
VCC, MR .............................................................................20mA
Output Current
RESET, RESET .................................................................20mA
Power Dissipation, PD @ TA = +25℃
SOT-23-5.............................................................................0.4W
SOT-143........................................................................... 0.32W
Operating Temperature Range.........................-40℃ to +125℃
Junction Temperature.......................................................150℃
Storage Temperature........................................-65℃ to +150℃
Lead Temperature (Soldering, 10s)...................................260℃
ESD Susceptibility
HBM..................................................................................4000V
MM......................................................................................400V
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress
ratings only, and 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 affect device reliability.
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.
SGMICRO reserves the right to make any change in circuit design, specification or other related things if necessary without notice at
any time. Please contact SGMICRO sales office to get the latest datasheet.
PIN DESCRIPTION
PIN NUMBER
FUNCTION
NAME
SGM811
SGM812
SOT-143 SOT-23-5 SOT-143 SOT-23-5
GND
1
1
1
1
Ground
NC
2
2
No Connect.
Active Low Logic Output. RESET remains low while VCC is below
2
3
—
—
the reset threshold or when MR is low; RESET then remains low
RESET
for at least 150ms after VCC rises above the reset threshold.
Active High Logic Output. RESET remains high while VCC is
below the reset threshold or when MR is low; RESET then
RESET
—
—
2
3
remains high for 240ms (typical) after VCC rises above the reset
threshold.
Manual Reset. This active low debounced input will ignore input
3
4
3
4
pulses of 100ns or less (typical) and is guaranteed to accept input
MR
pulses of greater than 10μs. Leave floating when not used.
VCC
4
5
4
5
Power supply voltage that is monitored.
SG Micro Corp
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5
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
TYPICAL PERFORMANCE CHARACTERISTICS
Power-Down RESET Delay vs. Temperature
Power-Down RESET Delay vs. Temperature
250
Power-Down RESET (µs)
Power-Down RESET (µs)
VOD = VTH - VCC
SGM811L/M/J
200
VOD = 10mV
150
VOD = 20mV
100
50
300
VOD = 100mV
VOD = 200mV
10
70
SGM811T/S/R
200
VOD = 20mV
150
100
VOD = 100mV
50
-50
-30
-10
30
50
90
-50
110 130
-30
-10
30
50
70
90
110 130
Supply Current vs. Temperature (No Load)
Power-Up RESET Delay vs. Temperature
270
10
Temperature (℃)
Temperature (℃)
30
SGM8_S
265
25
260
255
Supply Current (μA)
Power-Down RESET (ms)
VOD = 200mV
0
0
250
245
240
235
230
VCC = 5.5V
20
15
VCC = 3.6V
10
5
225
0
220
-50
-30
-10
10
30
50
70
90
110
-50
130
-30
-10
10
30
50
70
90
110
130
Temperature (℃)
Temperature (℃)
Normalized RESET Voltage Threshold vs.
Temperature
Maximum Transient Duration Without Causing a Reset
Pulse vs. RESET Comparator Overdrive
1.008
400
Maximum Transient Duration (µs)
Normalized RESET Threshold
VOD = VTH - VCC
VOD = 10mV
250
1.006
1.004
1.002
1
0.998
0.996
0.994
0.992
0.99
0.988
-50
-30
-10
10
30
50
70
Temperature (℃)
SG Micro Corp
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90
110 130
350
300
SGM811L/M/J
250
200
150
100
50
SGM811T/S/R
0
1
10
100
1000
RESET Comparator Overdrive, VTH - VCC (mV)
6
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
TYPICAL PERFORMANCE CHARACTERISTICS
RESET Output Voltage vs. Supply Voltage
Supply Voltage
5VP-P
2V/div
RESET Output
Voltage
SGM811R
SGM811S
200ms/div
SG Micro Corp
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7
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
APPLICATION INFORMATION
Manual Reset
Reset Output
The SGM811/SGM812 is equipped with a manual reset input
This input is designed to operate in a noisy environment where
unwanted glitches could be induced. These glitches could be
produced by the bouncing action of a switch contact, or where a
manual reset switch may be located some distance away from
the circuit (the cabling of which may pick-up noise).
The manual reset input is guaranteed to ignore logically valid
inputs that are faster than 100ns and to accept inputs longer in
duration than 10μs.
On power-up and after VCC rises above the reset threshold, an
internal timer holds the reset output active for 240ms (typical).
This is intended as a power-on reset signal for the processor. It
allows time for both the power supply and the microprocessor to
stabilize after power-up. If a power supply brownout or
interruption occurs, the reset output is similarly activated and
remains active for 240ms (typical) after the supply recovers.
This allows time for the power supply and microprocessor to
stabilize.
The SGM811 provides an active low reset output ( RESET ) while
the SGM812 provides an active high output ( RESET ). During
power-down of the SGM811, the RESET output remains valid
(low) with VCC as low as 1V. This ensures that the
microprocessor is held in a stable shutdown condition as the
supply falls and also ensures that no spurious activity can occur
via the microprocessor as it powers up.
Very Accurate Reset Threshold
Because the SGM811/SGM812 can operate effectively even
when there are large degradations of the supply voltages, the
possibility of a malfunction during a power failure is greatly
reduced. Another advantage of the SGM811/SGM812 is its very
accurate internal voltage reference circuit. Combined, these
benefits produce an exceptionally reliable microprocessor
supervisory circuit.
Glitch Immunity
The SGM811/SGM812 contains internal filtering circuitry
providing glitch immunity from fast transient glitches on the
power supply line.
VCC
VCC
VCC
SGM811
RESET
GND
RESET
VREF
VREF
t1
VREF
VREF
t1
t1 = RESET Time = 240ms Typical
VREF = RESET Voltage Threshold
Figure 1. Ensuring a Valid RESET Output Down to VCC = 0V
Figure 2. Power Fail RESET Timing
Ensuring A Valid Reset Output Down to Vcc
= 0V
Interfacing to Other Devices Output
When VCC falls below 1.0 V, the SGM811/SGM812’s RESET no
longer sinks current. Therefore, a high impedance CMOS logic
input connected to RESET may drift to undetermined logic
levels. To eliminate this problem, a 100kΩ resistor should be
connected from RESET to ground.
The SGM811/SGM812 is designed to integrate with as many
devices as possible. One feature of the SGM811/SGM812 is
the reset output, which is directly proportional to VCC (this is
guaranteed only while VCC is greater than 1V). This enables the
part to be used with both 3V and 5V, or any nominal voltage
within the minimum and maximum specifications for VCC.
SG Micro Corp
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8
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
PACKAGE OUTLINE DIMENSIONS
SOT-23-5
1.90
D
e1
E1
2.59
E
0.99
b
e
0.95
0.69
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
θ
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
c
0.2
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
e1
0.037 BSC
1.900 BSC
0.075 BSC
L
0.300
0.600
0.012
0.024
θ
0°
8°
0°
8°
SG Micro Corp
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9
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
PACKAGE OUTLINE DIMENSIONS
SOT-143
1.90
D
0.95
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
A1
θ
A2
c
0.250
Symbol
A
A1
A2
b
b1
c
D
d
E
E1
e
e1
L
L1
θ
SG Micro Corp
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Dimensions
In Millimeters
MIN
MAX
0.900
1.150
0.000
0.100
0.900
1.050
0.300
0.500
0.750
0.900
0.080
0.150
2.800
3.000
0.200 TYP
1.200
1.400
2.250
2.550
0.95 TYP
1.800
2.000
0.55 REF
0.300
0.500
0°
8°
Dimensions
In Inches
MIN
MAX
0.035
0.045
0.000
0.004
0.035
0.041
0.012
0.020
0.030
0.035
0.003
0.006
0.110
0.118
0.008 TYP
0.047
0.055
0.089
0.100
0.037 TYP
0.071
0.079
0.022 REF
0.012
0.020
0°
8°
10
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
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
P1
A0
K0
DIRECTION OF FEED
Reel Width (W1)
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Package Type
Reel Diameter
Reel Width
W1
(mm)
A0
(mm)
B0
(mm)
K0
(mm)
P0
(mm)
P1
(mm)
P2
(mm)
W
(mm)
Pin1
Quadrant
SOT-23-5
7″
9.5
3.2
3.2
1.4
4.0
4.0
2.0
8.0
Q3
SOT-143
7″
9.5
3.2
2.8
1.3
4.0
4.0
2.0
8.0
Q3
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11
Microprocessor Supervisory
with Manual Reset Input
SGM811/812
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Reel Type
Length
(mm)
Width
(mm)
Height
(mm)
Pizza/Carton
7″ (Option)
368
227
224
8
7″
442
410
224
18
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