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2024年2月24日发(作者：藩惠)

元器件交易网811

SGM812

Microprocessor Supervisory

with Manual Reset Input

GENERAL DESCRIPTION

FEATURES

−

Superior Upgrade for MAX811/MAX812 and

ADM811/ADM812

−

Specified over Temperature

−

Low Power Consumption (17 μA Typ)

−

Precision Voltage Monitor: 2.5V,3 V, 3.3 V, 5 V

Options

They provide a reset output during power-up,

−

Reset Assertion Down to 1 V VCC

−

160 ms Min Power-On Reset

power-down and brownout conditions. On power-up, an

Logic Low

RESETOutput (SGM811)

internal timer holds reset asserted for 240 ms. This holds

the microprocessor in a reset state until conditions have

Logic High RESET Output (SGM812)

stabilized. TheRESET

output remains operational with

−

Manual Reset Input

VCC as low as 1 V. The SGM811 provides an active low reset

−

Compact 4-Pin SOT143 and 5-Pin SOT23 Packages

The SGM811/SGM812 supervisory circuits monitor the

power supply voltage in microprocessor and digital

systems. The SGM811/SGM812 is designed to monitor

seven different voltages, these voltages have been selected

for the effective monitoring of 2.5V, 3 V, 3.3 V, and 5 V

supply voltage levels.

signal (RESET) while the SGM812 provides an active high

signal (RESET) output.

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 into a

state that can only be detected by the user. Allowing the

user to reset a system manually can reduce the damage or

danger that could otherwise be caused by an out-of-control

or locked system. The devices come in a 4-pin SOT143

and 5-pin SOT23 packages.

PIN CONFIGURATIONS（TOP VIEW）

SOT143-4GND14VCCRESET/RESET23MRAPPLICATIONS

Microprocessor Systems

Controllers

Intelligent Instruments

Automotive Systems

Safety Systems

Portable Instruments

SOT23-5GNDNCRESET/RESET1234MR5VCC

TYPICAL OPERATION CIRCUIT

VCCVCCMICROPROCESSORSYSTEMRESET100KOGNDGND

SGM811RESETMR

Shengbang Microelectronics Co, Ltd

Tel: 86/451/84348461

Nov 2006

元器件交易网

ORDERING INFORMATION

ORDERING

NUMBER

RESET

THRESHOLD

(V)

PECKAGETYPE

SPECIFIED

TEMPERATURE

RANGE

PACKAGE

MARKING

811L

811M

811J

811T

811S

811R

811Z

811L

811M

811J

811T

811S

811R

811Z

812L

812M

812J

812T

812S

812R

812Z

812L

812M

812J

812T

812S

812R

812Z

PACKAGE

OPTION

SGM811-LXN5 4.63

SOT23-5

SGM811-M

XN5 4.38

SOT23-5

SGM811-JXN5 4.00

SOT23-5

SGM811-T

XN5 3.08

SOT23-5

SGM811-S

XN5 2.93

SOT23-5

SGM811-R

XN5 2.63

SOT23-5

SGM811-Z

XN5 2.32

SOT23-5

SGM811-LXKA4 4.63

SOT143-4

SGM811-MX

KA4 4.38

SOT143-4

SGM811-JX

KA4 4.00

SOT143-4

SGM811-TX

KA4 3.08

SOT143-4

SGM811-SX

KA4 2.93

SOT143-4

SGM811-RX

KA4 2.63

SOT143-4

SGM811-Z

KA4 2.32

SOT143-4

SGM812-LXN5 4.63

SOT23-5

SGM812-M

XN5 4.38

SOT23-5

SGM812-JXN5 4.00

SOT23-5

SGM812-T

XN5 3.08

SOT23-5

SGM812-S

XN5 2.93

SOT23-5

SGM812-R

XN5 2.63

SOT23-5

SGM812-Z

XN5 2.32

SOT23-5

SGM812-LX

KA4 4.63

SOT143-4

SGM812-MX

KA4 4.38

SOT143-4

SGM812-JX

KA4 4.00

SOT143-4

SGM812-TX

KA4 3.08

SOT143-4

SGM812-SX

KA4 2.93

SOT143-4

SGM812-RX

KA4 2.63

SOT143-4

SGM812-Z

KA4 2.32

SOT143-4

- 40°C to +125°C

Tape and Reel, 3000

2SGM811/812

元器件交易网CTRICAL CHARACTERISTICS

(VCC Typ = 5 V for L/M/J Models, 3.3 V for T/S Models, 3 V for R Models, 2.5 V for Z Models; unless otherwise noted.)

PARAMETER

SUPPLY

Voltage

TA = 0°C to 70°C

TA = - 40°C to +125°C

VCC < 5.5 V, SGM81_L/M/J, TA = 25°C

Current

VCC < 5.5 V, SGM81_L/M/J, TA = - 40°C to +125°C

VCC < 3.6 V, SGM81_R/S/T/Z, TA = 25°C

VCC < 3.6 V, SGM81_R/S/T/Z, TA = - 40°C to +125°C

RESET VOLTAGE THRESHOLD

SGM81_L

SGM81_M

SGM81_J

SGM81_T

SGM81_S

SGM81_R

SGM81_Z

RESET THRESHOLD

Temperature Coefficient

VCC to RESET/RESET

Delay

Reset Active Timeout Period

MANUAL RESET

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

4.537

4.40

4.292

4.16

3.92

3.8

3.003

2.92

2.857

2.78

2.564

2.50

2.262

2.22

CONDITIONS MIN TYP MAX UNITS1.0 5.5 V

1.2 5.5 V

20 30 µA

50 µA

17 25 µA

45 µA

4.63 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

2.63 2.696 V

2.76 V

2. 23

2.378

2.42

30 ppm/°CVCC

= VTH

to (VTH

–100 mV)

TA = - 40°C to +85°C

TA = - 40°C to +125°C

20 µs

160 240 560 ms

100 840 ms

Minimum Pulsewidth

Glitch Immunity

RESET/RESETPropagation

Delay

10 µs

100

0.5 µs

Pull-Up Resistance

The Manual Reset Circuit Will Act On:

An Input Rising Above

An Input Falling Below

An Input Rising Above

An Input Falling Below

VCC > VTH(MAX), SGM81_L/M/J

VCC > VTH(MAX), SGM81_R/S/T/Z

1 MΩ

2.3

0.8

0.25×VCCV

0.7×VCC

3SGM811/812

元器件交易网CTRICAL CHARACTERISTICS (continued)

(VCC Typ = 5 V for L/M/J Models, 3.3 V for T/S Models, 3 V for R Models, 2.5 V for Z Models; unless otherwise noted.)

PARAMETER

RESET/RESET OUTPUT VOLTAGE

Low (SGM811R/S/T/Z)

Low (SGM811L/M/J)

Low (SGM811R/S/T/Z/L/M/J)

High (SGM811R/S/T/Z)

High (SGM811L/M/J)

Low (SGM812R/S/T/Z)

Low (SGM812L/M/J)

High (SGM812 R/S/T/Z/L/M/J)

CONDITIONS MIN TYP MAX UNITS

VCC = VTH(MIN), ISINK = 1.2mA

VCC = VTH(MIN), ISINK = 3.2mA

VCC > 1.0 V, ISINK = 50µA

VCC > VTH(MAX), ISOURCE = 500µA

VCC > VTH(MAX), ISOURCE = 800µA

VCC = VTH(MAX), ISINK = 1.2mA

VCC = VTH(MAX), ISINK = 3.2mA

1.8 V < VCC < VTH(MIN), ISOURCE = 150µA

0.8×VCCVCC– 1.5

0.8×VCC

0.3

0.4

0.3

0.4

Specifications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS

(Typical values are at TA = 25°C, unless otherwise noted.)

Terminal Voltage (With Respect to Ground)

–0.3 V to +6 V

All Other Inputs ............................................ –0.3 V to VCC + 0.3 V

Input Current

VCC ,

MR................................................................................ 20 mA

Output Current

RESET,

20 mA

Power Dissipation, PD @ TA = 25℃

SOT23-5 .....................................................................................0.4W

0.32W

Operating - 40°C to +125°C

+150°C

- 65°C to +150°C

Lead Temperature (soldering, 10s).....................................+260°C

ESD Susceptibility

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.

PIN DESCRIPTION

Pin Number

NAME

GND

SGM811 SGM812

SOT143-4 SOT23-5 SOT143-4

1 1 1 Ground

FUNCTION

RESETNo connect.

Active Low Logic Output.

RESETremains low while VCC is below the reset

threshold or whenMR is low;

RESETthen remains low for at least 160 ms after

2 3 —

VCC rises above the reset threshold.

Active High Logic Output. RESET remains high while VCC is below the reset

threshold or when

MRis low; RESET then remains high for 240 ms (typical) after

RESET — — 2

VCC rises above the reset threshold.

Manual Reset. This active low debounced input will ignore input pulses of 100 ns or

less (typical) and is guaranteed to accept input pulses of greater than 10 µs. Leave

MR 3 4 3

floating when not used.

VCC 4 5 4 Power supply voltage that is monitored.

SGM811/812

元器件交易网

TYPICAL PERFORMANCE CHARACTERISTICS

Power-Down RESET Delay ature250SGM811L/M/JVOD = VTH - VCC)Sµ200(

TVOD = 10mVESE150RVOD = 20mV

nwo100D-rewo50VOD = 100mVVOD = 200mVP0-50-30-110130Temperature(℃)

Power-Up RESET Delay ature264)262SGM811SSm(260

TES258ER

256nwo254D-re252woP250248-50-30-110130Temperature(℃)

Normalized RESET Voltage Threshold ature1.008dl1.006ohs1.004erh1.002TT1ESE0.998R0.996dez0.994ilam0.992roN0.990.988-50-30-110130Temperature(℃)

Power-Down RESET Delay ature300SGM811T/S/RVOD = VTH - VCC)S250VOD = 10mVµ(

TE200SER

n150VOD = 20mVwoD-100rewoVOD = 200mVP50VOD= 100mV0-50-30-110130

Temperature(℃)Supply Current vs. Temperature (No Load)3025VCC = 5.5V)Aµ(

20tnVeCC = 3.6Vrru15C

ylp10puS50-50-30-110130

Temperature(℃)

Maximum Transient Duration Without Causing aReset Pulse vs. RESET Comparator Overdrive400)Sµ(

350noita300ruD

250SGM811L/M/Jtneis200narT150

mu100mixa50MSGM811T/S/RRESET Comparator Overdrive

VTH - VCC(mV)

SGM811/812

５

元器件交易网

TYPICAL PERFORMANCE CHARACTERISTICS

RESET Output Voltage vs. Supply VoltageSupply Voltage5VP-PvidRESET Output/VVoltage2SGM811RSGM811S200ms/div

６

SGM811/812

元器件交易网

APPLICATION NOTES

MANUAL RESET

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

RESET OUTPUT

On power-up and after VCC

rises above the reset threshold, an

internal timer holds the reset output active for 240 ms (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

noise).

The manual reset input is guaranteed to ignore logically valid

inputs that are faster than 100 ns and to accept inputs longer in

duration than 10 µs.

BENEFITS OF A 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.

VCCVCCSGM811RESETGNDFigure 1. Ensuring a Valid

RESETOutput Down to VCC = 0V

ENSURING A VALID RESET OUTPUT DOWN TO VCC

= 0 V

When VCC falls below1.0 V, the SGM811/SGM812’s

RESETno

longer sinks current. Therefore, a high impedance CMOS logic

input connected to

RESETmay drift to undetermined logic

levels. To eliminate this problem, a 100 k

Ω resistor should be

connected from

RESETto ground.

remains active for 240 ms (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

RESEToutput

remains valid (low) with VCC as low as 1 V. 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.

Glitch Immunity

The SGM811/SGM812 contains internal filtering circuitry

providing glitch immunity from fast transient glitches on the

power supply line.

VCCVREFVREFVVREFREFRESETt1t1t

RESETTime = 240ms Typical

VREF =RESET Voltage Threshold

Figure 2. Power Fail

RESETTiming

INTERFACING TO OTHER DEVICES

Output

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 1 V). This enables

the part to be used with both 3 V and 5 V, or any nominal

voltage within the minimum and maximum specifications for

VCC.

SGM811/812

７

元器件交易网

PACKAGE OUTLINE DIMENSIONS

SOT23-5

DbL0θ0.20SymbolDimensions Dimensions In Millimeters In Inches

Min Max Min MaxA 1.050 1.250 0.041 0.049A1 0.000 0.100 0.000 0.004E1A2 1.050 1.150 0.041 0.045b 0.300 0.400 0.012 0.016c 0.100 0.200 0.004 0.008ELee1A1CD 2.820 3.020 0.111 0.119E 1.500 1.700 0.059 0.067E1 2.650 2.950 0.104 0.116e 0.950TYP 0.037TYP

e1 1.800 2.000 0.071 0.079A2L 0.700REF 0.028REF

L1 0.300 0.600 0.012 0.024θ 0° 8° 0° 8°

８

SGM811/812

元器件交易网

PACKAGE OUTLINE DIMENSIONS

SOT143- 4

De1SCLSymbolDimensions

In Millimeters

Min Max

A 0.890 1.120

A1 0.013 0.100

B 0.760 0.940

B1 0.370 0.510

C 0.085 0.180

He2BB1ED 2.800 3.040

E 1.200 1.400

e1 1.920 BSC

e2 0.200 BSC

H 2.100 2.640

L 0.55 REF

S 0.450 0.600

A1A

９

SGM811/812

2024年2月24日发(作者：藩惠)

元器件交易网811

SGM812

Microprocessor Supervisory

with Manual Reset Input

GENERAL DESCRIPTION

FEATURES

−

Superior Upgrade for MAX811/MAX812 and

ADM811/ADM812

−

Specified over Temperature

−

Low Power Consumption (17 μA Typ)

−

Precision Voltage Monitor: 2.5V,3 V, 3.3 V, 5 V

Options

They provide a reset output during power-up,

−

Reset Assertion Down to 1 V VCC

−

160 ms Min Power-On Reset

power-down and brownout conditions. On power-up, an

Logic Low

RESETOutput (SGM811)

internal timer holds reset asserted for 240 ms. This holds

the microprocessor in a reset state until conditions have

Logic High RESET Output (SGM812)

stabilized. TheRESET

output remains operational with

−

Manual Reset Input

VCC as low as 1 V. The SGM811 provides an active low reset

−

Compact 4-Pin SOT143 and 5-Pin SOT23 Packages

The SGM811/SGM812 supervisory circuits monitor the

power supply voltage in microprocessor and digital

systems. The SGM811/SGM812 is designed to monitor

seven different voltages, these voltages have been selected

for the effective monitoring of 2.5V, 3 V, 3.3 V, and 5 V

supply voltage levels.

signal (RESET) while the SGM812 provides an active high

signal (RESET) output.

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 into a

state that can only be detected by the user. Allowing the

user to reset a system manually can reduce the damage or

danger that could otherwise be caused by an out-of-control

or locked system. The devices come in a 4-pin SOT143

and 5-pin SOT23 packages.

PIN CONFIGURATIONS（TOP VIEW）

SOT143-4GND14VCCRESET/RESET23MRAPPLICATIONS

Microprocessor Systems

Controllers

Intelligent Instruments

Automotive Systems

Safety Systems

Portable Instruments

SOT23-5GNDNCRESET/RESET1234MR5VCC

TYPICAL OPERATION CIRCUIT

VCCVCCMICROPROCESSORSYSTEMRESET100KOGNDGND

SGM811RESETMR

Shengbang Microelectronics Co, Ltd

Tel: 86/451/84348461

Nov 2006

元器件交易网

ORDERING INFORMATION

ORDERING

NUMBER

RESET

THRESHOLD

(V)

PECKAGETYPE

SPECIFIED

TEMPERATURE

RANGE

PACKAGE

MARKING

811L

811M

811J

811T

811S

811R

811Z

811L

811M

811J

811T

811S

811R

811Z

812L

812M

812J

812T

812S

812R

812Z

812L

812M

812J

812T

812S

812R

812Z

PACKAGE

OPTION

SGM811-LXN5 4.63

SOT23-5

SGM811-M

XN5 4.38

SOT23-5

SGM811-JXN5 4.00

SOT23-5

SGM811-T

XN5 3.08

SOT23-5

SGM811-S

XN5 2.93

SOT23-5

SGM811-R

XN5 2.63

SOT23-5

SGM811-Z

XN5 2.32

SOT23-5

SGM811-LXKA4 4.63

SOT143-4

SGM811-MX

KA4 4.38

SOT143-4

SGM811-JX

KA4 4.00

SOT143-4

SGM811-TX

KA4 3.08

SOT143-4

SGM811-SX

KA4 2.93

SOT143-4

SGM811-RX

KA4 2.63

SOT143-4

SGM811-Z

KA4 2.32

SOT143-4

SGM812-LXN5 4.63

SOT23-5

SGM812-M

XN5 4.38

SOT23-5

SGM812-JXN5 4.00

SOT23-5

SGM812-T

XN5 3.08

SOT23-5

SGM812-S

XN5 2.93

SOT23-5

SGM812-R

XN5 2.63

SOT23-5

SGM812-Z

XN5 2.32

SOT23-5

SGM812-LX

KA4 4.63

SOT143-4

SGM812-MX

KA4 4.38

SOT143-4

SGM812-JX

KA4 4.00

SOT143-4

SGM812-TX

KA4 3.08

SOT143-4

SGM812-SX

KA4 2.93

SOT143-4

SGM812-RX

KA4 2.63

SOT143-4

SGM812-Z

KA4 2.32

SOT143-4

- 40°C to +125°C

Tape and Reel, 3000

2SGM811/812

元器件交易网CTRICAL CHARACTERISTICS

(VCC Typ = 5 V for L/M/J Models, 3.3 V for T/S Models, 3 V for R Models, 2.5 V for Z Models; unless otherwise noted.)

PARAMETER

SUPPLY

Voltage

TA = 0°C to 70°C

TA = - 40°C to +125°C

VCC < 5.5 V, SGM81_L/M/J, TA = 25°C

Current

VCC < 5.5 V, SGM81_L/M/J, TA = - 40°C to +125°C

VCC < 3.6 V, SGM81_R/S/T/Z, TA = 25°C

VCC < 3.6 V, SGM81_R/S/T/Z, TA = - 40°C to +125°C

RESET VOLTAGE THRESHOLD

SGM81_L

SGM81_M

SGM81_J

SGM81_T

SGM81_S

SGM81_R

SGM81_Z

RESET THRESHOLD

Temperature Coefficient

VCC to RESET/RESET

Delay

Reset Active Timeout Period

MANUAL RESET

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

4.537

4.40

4.292

4.16

3.92

3.8

3.003

2.92

2.857

2.78

2.564

2.50

2.262

2.22

CONDITIONS MIN TYP MAX UNITS1.0 5.5 V

1.2 5.5 V

20 30 µA

50 µA

17 25 µA

45 µA

4.63 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

2.63 2.696 V

2.76 V

2. 23

2.378

2.42

30 ppm/°CVCC

= VTH

to (VTH

–100 mV)

TA = - 40°C to +85°C

TA = - 40°C to +125°C

20 µs

160 240 560 ms

100 840 ms

Minimum Pulsewidth

Glitch Immunity

RESET/RESETPropagation

Delay

10 µs

100

0.5 µs

Pull-Up Resistance

The Manual Reset Circuit Will Act On:

An Input Rising Above

An Input Falling Below

An Input Rising Above

An Input Falling Below

VCC > VTH(MAX), SGM81_L/M/J

VCC > VTH(MAX), SGM81_R/S/T/Z

1 MΩ

2.3

0.8

0.25×VCCV

0.7×VCC

3SGM811/812

元器件交易网CTRICAL CHARACTERISTICS (continued)

(VCC Typ = 5 V for L/M/J Models, 3.3 V for T/S Models, 3 V for R Models, 2.5 V for Z Models; unless otherwise noted.)

PARAMETER

RESET/RESET OUTPUT VOLTAGE

Low (SGM811R/S/T/Z)

Low (SGM811L/M/J)

Low (SGM811R/S/T/Z/L/M/J)

High (SGM811R/S/T/Z)

High (SGM811L/M/J)

Low (SGM812R/S/T/Z)

Low (SGM812L/M/J)

High (SGM812 R/S/T/Z/L/M/J)

CONDITIONS MIN TYP MAX UNITS

VCC = VTH(MIN), ISINK = 1.2mA

VCC = VTH(MIN), ISINK = 3.2mA

VCC > 1.0 V, ISINK = 50µA

VCC > VTH(MAX), ISOURCE = 500µA

VCC > VTH(MAX), ISOURCE = 800µA

VCC = VTH(MAX), ISINK = 1.2mA

VCC = VTH(MAX), ISINK = 3.2mA

1.8 V < VCC < VTH(MIN), ISOURCE = 150µA

0.8×VCCVCC– 1.5

0.8×VCC

0.3

0.4

0.3

0.4

Specifications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS

(Typical values are at TA = 25°C, unless otherwise noted.)

Terminal Voltage (With Respect to Ground)

–0.3 V to +6 V

All Other Inputs ............................................ –0.3 V to VCC + 0.3 V

Input Current

VCC ,

MR................................................................................ 20 mA

Output Current

RESET,

20 mA

Power Dissipation, PD @ TA = 25℃

SOT23-5 .....................................................................................0.4W

0.32W

Operating - 40°C to +125°C

+150°C

- 65°C to +150°C

Lead Temperature (soldering, 10s).....................................+260°C

ESD Susceptibility

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.

PIN DESCRIPTION

Pin Number

NAME

GND

SGM811 SGM812

SOT143-4 SOT23-5 SOT143-4

1 1 1 Ground

FUNCTION

RESETNo connect.

Active Low Logic Output.

RESETremains low while VCC is below the reset

threshold or whenMR is low;

RESETthen remains low for at least 160 ms after

2 3 —

VCC rises above the reset threshold.

Active High Logic Output. RESET remains high while VCC is below the reset

threshold or when

MRis low; RESET then remains high for 240 ms (typical) after

RESET — — 2

VCC rises above the reset threshold.

Manual Reset. This active low debounced input will ignore input pulses of 100 ns or

less (typical) and is guaranteed to accept input pulses of greater than 10 µs. Leave

MR 3 4 3

floating when not used.

VCC 4 5 4 Power supply voltage that is monitored.

SGM811/812

元器件交易网

TYPICAL PERFORMANCE CHARACTERISTICS

Power-Down RESET Delay ature250SGM811L/M/JVOD = VTH - VCC)Sµ200(

TVOD = 10mVESE150RVOD = 20mV

nwo100D-rewo50VOD = 100mVVOD = 200mVP0-50-30-110130Temperature(℃)

Power-Up RESET Delay ature264)262SGM811SSm(260

TES258ER

256nwo254D-re252woP250248-50-30-110130Temperature(℃)

Normalized RESET Voltage Threshold ature1.008dl1.006ohs1.004erh1.002TT1ESE0.998R0.996dez0.994ilam0.992roN0.990.988-50-30-110130Temperature(℃)

Power-Down RESET Delay ature300SGM811T/S/RVOD = VTH - VCC)S250VOD = 10mVµ(

TE200SER

n150VOD = 20mVwoD-100rewoVOD = 200mVP50VOD= 100mV0-50-30-110130

Temperature(℃)Supply Current vs. Temperature (No Load)3025VCC = 5.5V)Aµ(

20tnVeCC = 3.6Vrru15C

ylp10puS50-50-30-110130

Temperature(℃)

Maximum Transient Duration Without Causing aReset Pulse vs. RESET Comparator Overdrive400)Sµ(

350noita300ruD

250SGM811L/M/Jtneis200narT150

mu100mixa50MSGM811T/S/RRESET Comparator Overdrive

VTH - VCC(mV)

SGM811/812

５

元器件交易网

TYPICAL PERFORMANCE CHARACTERISTICS

RESET Output Voltage vs. Supply VoltageSupply Voltage5VP-PvidRESET Output/VVoltage2SGM811RSGM811S200ms/div

６

SGM811/812

元器件交易网

APPLICATION NOTES

MANUAL RESET

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

RESET OUTPUT

On power-up and after VCC

rises above the reset threshold, an

internal timer holds the reset output active for 240 ms (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

noise).

The manual reset input is guaranteed to ignore logically valid

inputs that are faster than 100 ns and to accept inputs longer in

duration than 10 µs.

BENEFITS OF A 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.

VCCVCCSGM811RESETGNDFigure 1. Ensuring a Valid

RESETOutput Down to VCC = 0V

ENSURING A VALID RESET OUTPUT DOWN TO VCC

= 0 V

When VCC falls below1.0 V, the SGM811/SGM812’s

RESETno

longer sinks current. Therefore, a high impedance CMOS logic

input connected to

RESETmay drift to undetermined logic

levels. To eliminate this problem, a 100 k

Ω resistor should be

connected from

RESETto ground.

remains active for 240 ms (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

RESEToutput

remains valid (low) with VCC as low as 1 V. 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.

Glitch Immunity

The SGM811/SGM812 contains internal filtering circuitry

providing glitch immunity from fast transient glitches on the

power supply line.

VCCVREFVREFVVREFREFRESETt1t1t

RESETTime = 240ms Typical

VREF =RESET Voltage Threshold

Figure 2. Power Fail

RESETTiming

INTERFACING TO OTHER DEVICES

Output

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 1 V). This enables

the part to be used with both 3 V and 5 V, or any nominal

voltage within the minimum and maximum specifications for

VCC.

SGM811/812

７

元器件交易网

PACKAGE OUTLINE DIMENSIONS

SOT23-5

DbL0θ0.20SymbolDimensions Dimensions In Millimeters In Inches

e1 1.800 2.000 0.071 0.079A2L 0.700REF 0.028REF

L1 0.300 0.600 0.012 0.024θ 0° 8° 0° 8°

８

SGM811/812

元器件交易网

PACKAGE OUTLINE DIMENSIONS

SOT143- 4

De1SCLSymbolDimensions

In Millimeters

Min Max

A 0.890 1.120

A1 0.013 0.100

B 0.760 0.940

B1 0.370 0.510

C 0.085 0.180

He2BB1ED 2.800 3.040

E 1.200 1.400

e1 1.920 BSC

e2 0.200 BSC

H 2.100 2.640

L 0.55 REF

S 0.450 0.600

A1A

９

SGM811/812

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