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2024年2月25日发(作者：银代蓝)

SGM803

SGM809

SGM810

Microprocessor

Supervisory

Circuit in 3-Pin SOT23

GENERAL DESCRIPTION

FEATURES

The SGM803/SGM809/SGM810 supervisory circuits

monitor the power supply voltage in microprocessor and

digital systems. They provide a reset output during

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

power-up, an internal timer holds reset asserted for 240 ms.

This holds the microprocessor in a reset state until

conditions have stabilized. TheRESET

output remains

operational with VCC as low as 1 V. The SGM803/SGM809

provides an active low reset signal (RESET) while the

SGM810 provides an active high signal (RESET) output.

The SGM809/SGM810 have push-pull outputs, whereas the

SGM803 has an open-drain output, which requires an

external pull-up resistor.

Seven reset threshold voltage options are available suitable

for monitoring 2.5V, 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 17µA makes the

SGM803/SGM809/SGM810 ideal for use in portable, battery

operated equipment. They are available in the 3-pin SOT23

package.

−

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

Options

−

Superior Upgrade for MAX803/MAX809/MAX810

and SGM803/SGM809/SGM810

−

Fully Specified over Temperature

−

Low Power Consumption (17μA Typ)

−

Reset Assertion Down to 1 V VCC

−

160 ms Min Power-On Reset

Open-Drain

RESETOutput(SGM803)

(SGM809)

Push-Pull

RESET Output

Push-Pull RESET Output (SGM810)

−

Compact 3-Pin SOT23 Package

PIN CONFIGURATIONS（TOP VIEW）

GND1APPLICATIONS

Microprocessor Systems

Controllers

Intelligent Instruments

Automotive Systems

Safety Systems

Portable Instruments

SGM803SGM809SGM810RESET/RESET23VCC

SOT23-3TYPICAL OPERATION CIRCUIT

VCCVCCRPULL-UPSGM803 onlyRESET1SGM803/SGM809RESETMICROPROCESSORSYSTEMRESETSGM809-ZXN3L(only)GND23VCCSOT23-3(L-Type)GNDGND

Shengbang Microelectronics Co, Ltd

Tel: 86/451/84348461

REV. B

ORDERING INFORMATION

MODEL

RESET

THRESHOLD

(V)

4.63

4.38

3.08

2.93

2.63

2.32

4.63

4.38

4.00

SGM809

3.08

2.93

2.63

2.32

4.63

4.38

4.00

SGM810

3.08

2.93

2.63

2.32

SPECIFIED

TEMPERATURE

RANGE

ORDERING

NUMBER

PACKAGE

MARKING

PACKAGE

OPTION

SGM803

- 40°C to +125°C

SGM803-LXN3 803L

Tape and Reel, 3000SGM803-MXN3 803M

Tape and Reel, 3000SGM803-TXN3 803T

Tape and Reel, 3000SGM803-SXN3 803S

Tape and Reel, 3000SGM803-RXN3 803R

Tape and Reel, 3000SGM803-ZXN3 803Z

SGM809-MXN3 809M

SGM809-JXN3 809J

SGM809-TXN3 809T

SGM809-SXN3 809S

SGM809-RXN3 809R

SGM809-ZXN3 809Z

SGM809-ZXN3L 809ZL

SGM810-MXN3 810M

SGM810-JXN3 810J

SGM810-TXN3 810T

SGM810-SXN3 810S

SGM810-RXN3 810R

SGM810-ZXN3 810Z

Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000Tape and Reel, 3000SGM809-LXN3 809L

Tape and Reel, 3000SGM810-LXN3 810L

Tape and Reel, 3000

2SGM803/809/810

ABSOLUTE MAXIMUM RATINGS

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

SOT23-3, θJA....................................................................... 250℃/W

–0.3 V to +6 V Operating - 40°C to +125°C

+150°C

RESET,

–0.3 V to VCC +0.3 V

- 65°C to +150°C

Input Current , .20 mA

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

Output Current, 20 mA

ESD Susceptibility

Rate of Rise, VCC .................................................................100 V/µs

4000V

Power Dissipation, PD @ TA = 25℃

MM..............................................................................................400V

SOT23-3 .....................................................................................0.4W

Package Thermal Resistance

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

NAME

Pin Number

SGM809-

SGM810SGM803 SGM809

ZXN3L

FUNCTION

GND 1 1 2 1 Ground

RESET 2 2 1 —

Active Low reset.

RESETremains low while VCC is below the reset

threshold, and remains low for 240 ms (typ) after VCC rises above the

reset threshold.

Active High reset. RESET

remains high while VCC is below the reset

RESET

VCC

— — — 2

threshold, and remains high for 240 ms (typ) after VCC rises above the

reset threshold.

3 3 3 3 Power supply voltage that is monitored.

3SGM803/809/810

ELECTRICAL 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.)

SUPPLY

Voltage

TA = 0°C to 70°C

TA = - 40°C to +125°C

VCC < 5.5 V, SGM8_L/M/J, TA = 25°C

Current

VCC < 5.5 V, SGM8_L/M/J, TA = - 40°C to +125°C

VCC < 3.6 V, SGM8_R/S/T/Z, TA = 25°C

VCC < 3.6 V, SGM8_R/S/T/Z, TA = - 40°C to +125°C

RESET VOLTAGE THRESHOLD

SGM8_L

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

SGM8_R

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

VCC = VTH to (VTH –100 mV)

TA = - 40°C to +85°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

4.63 4.723 V

1.0 5.5 V

1.2 5.5 V

20 30 µA

50 µA

17 25 µA

45 µA

PARAMETER CONDITIONS MIN TYP MAXUNITS

4.86 V

4.38 4.468 V

SGM8_M

4.56 V

4.00 4.08 V

SGM809J/SGM810J

4.2 V

3.08 3.157 V

SGM8_T

3.23 V

2.93 3.003 V

SGM8_S

3.08 V

2.63 2.696 V

2.76 V

2.32 2.378 V

SGM8_Z

RESET THRESHOLD

Temperature Coefficient

VCC to RESET/RESET Delay

Reset Active Timeout Period

2.42 V

ppm/°C

20 µs

160 240 560 ms

100 840 ms

RESET/RESET OUTPUT VOLTAGE

Low (SGM803R/S/T/Z)

Low (SGM809R/S/T/Z)

Low (SGM803L/M/J)

Low (SGM809L/M/J)

Low (SGM803R/S/T/L/M/J/Z)

Low (SGM809R/S/T/L/M/J/Z)

High (SGM809R/S/T/Z)

High (SGM809L/M/J)

Low (SGM810R/S/T/Z)

Low (SGM810L/M/J)

High (SGM810 R/S/T/L/M/J)

VCC = VTH(MIN), ISINK = 1.2mA 0.3

VCC = VTH(MIN), ISINK = 3.2mA 0.4

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

VCC > VTH, reset de-asserted

0.8×VCC

VCC– 1.5

0.8×VCC

0.3

0.4

µA

RESETOpen-Drain Output

Leakage Current (SGM803)

Specifications subject to change without notice.

４

SGM803/809/810

TYPICAL PERFORMANCE CHARACTERISTICS

Power-Down RESET Delay ature250SGM8_L/M/JVOD = VTH - VCC)Sµ200(

TVOD = 10mVESE150RVOD = 20mV

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

Power-Up RESET Delay ature264)262SGM809SSm(260

ETS258ER

256nwoD254-re252woP250248-50-30-110130Temperature(℃)

Normalized RESET Voltage Threshold ature1.008d1.006olhs1.004erh1.002TT1ESE0.998R0.996dez0.994ilam0.992roN0.990.988-50-30-110130Temperature(℃)

Power-Down RESET Delay ature300SGM8_T/S/R/ZVOD = VTH - VCC)S250VOD = 10mVµ(

TE200SER

n150VOD = 20mVwoD-100rewo= 100mVVOD = 200mVP50VOD0-50-30-110130

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

20tnVeCC = 3.6Vrru15C

ylp10puS50-50-30-110130Temperature(℃)

Maximum Transient Duration Without Causing aReset Pulse vs. RESET Comparator Overdrive)400Sµ(

350noita300ruD

250SGM8_L/M/Jtneis200nar150

Tmu100mixa50MSGM8_R/S/T/Z

RESET Comparator Overdrive

VTH - VCC(mV)

SGM803/809/810

５

TYPICAL PERFORMANCE CHARACTERISTICS

RESET Output Voltage vs. Supply VoltageSupply Voltage5VP-PvidRESET Output/VVoltage2SGM809RSGM809S200ms/div

６SGM803/809/810

APPLICATION NOTES

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 SGM803/

SGM809/SGM810 series can operate effectively even when

there are large degradations of the supply voltages. Another

advantage of the SGM803/ SGM809/SGM810 series is its very

accurate internal voltage reference circuit. These benefits

combine to produce an exceptionally reliable voltage monitor

circuit.

INTERFACING TO OTHER DEVICES’ OUTPUT

The SGM803/SGM809/SGM810 series is designed to integrate

with as many devices as possible and, therefore, has a

standard output dependent on VCC. This enables the parts to

be used in both 3 V and 5 V, or any nominal voltage within the

minimum and maximum specifications for VCC. This design

simplifies interfacing this device to other devices.

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 SGM803/SGM809/SGM810 can

easily be integrated into existing interrupt-handling circuits, as

shown in Figure 1, or can be used as a standalone device.

When VCC falls below 1.0 V, the SGM803/SGM809

RESETno

longer sinks current. A high impedance CMOS logic input

connected to

RESETmay, therefore, drift to undetermined logic

levels. To eliminate this problem, a 100kΩ resistor should be

connected fromRESETto ground.

ENSURING A VALID RESET OUTPUT DOWN TO

VCC = 0 V

VCCVCCSGM809RESETGND

PRIORITY ENCODER74LS1474-LINE BCD TO

MICROPROCESSORFigure 2. Ensuring a Valid Reset Output Down to VCC = 0V

VCCVCCSGM809RESETGNDOTHER SENSING

DEVICES

Figure 1. Interfacing to Microprocessors with Multiple

Interrupts

７SGM803/809/810

PACKAGE OUTLINE DIMENSIONS

SOT23-3

DbL0θ0.20SymbolDimensions Dimensions

In Millimeters In Inches

Min Max Min Max1.250 0.041 0.0490.100 0.000 0.0041.150 0.041 0.0450.400 0.012 0.0160.200 0.004 0.0083.020 0.111 0.1191.700 0.059 0.0672.950 0.104 0.1162.000 0.071 0.0790.600 0.012 0.024A 1.050A1 0.000E1A2 1.050b 0.300c 0.100D 2.820E 1.500Eee1A1CLE1 2.650e1 1.800e 0.950TYP 0.037TYP

L 0.700REF 0.028REF

A2AL1 0.300

θ 0° 8° 0° 8°

８SGM803/809/810

REVISION HISTORY

Location Page

11/06— Data Sheet changed from REV. A to REV. B

Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Shengbang Microelectronics Co, Ltd

Unit 3, ChuangYe Plaza

No.5, TaiHu Northern Street, YingBin Road Centralized Industrial Park

Harbin Development Zone

Harbin, HeiLongJiang 150078

P.R. China

Tel.: 86-451-84348461

Fax: 86-451-84308461

９

SGM803/809/810

2024年2月25日发(作者：银代蓝)

SGM803

SGM809

SGM810

Microprocessor

Supervisory

Circuit in 3-Pin SOT23

GENERAL DESCRIPTION

FEATURES

The SGM803/SGM809/SGM810 supervisory circuits

monitor the power supply voltage in microprocessor and

digital systems. They provide a reset output during

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

power-up, an internal timer holds reset asserted for 240 ms.

This holds the microprocessor in a reset state until

conditions have stabilized. TheRESET

output remains

operational with VCC as low as 1 V. The SGM803/SGM809

provides an active low reset signal (RESET) while the

SGM810 provides an active high signal (RESET) output.

The SGM809/SGM810 have push-pull outputs, whereas the

SGM803 has an open-drain output, which requires an

external pull-up resistor.

Seven reset threshold voltage options are available suitable

for monitoring 2.5V, 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 17µA makes the

SGM803/SGM809/SGM810 ideal for use in portable, battery

operated equipment. They are available in the 3-pin SOT23

package.

−

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

Options

−

Superior Upgrade for MAX803/MAX809/MAX810

and SGM803/SGM809/SGM810

−

Fully Specified over Temperature

−

Low Power Consumption (17μA Typ)

−

Reset Assertion Down to 1 V VCC

−

160 ms Min Power-On Reset

Open-Drain

RESETOutput(SGM803)

(SGM809)

Push-Pull

RESET Output

Push-Pull RESET Output (SGM810)

−

Compact 3-Pin SOT23 Package

PIN CONFIGURATIONS（TOP VIEW）

GND1APPLICATIONS

Microprocessor Systems

Controllers

Intelligent Instruments

Automotive Systems

Safety Systems

Portable Instruments

SGM803SGM809SGM810RESET/RESET23VCC

SOT23-3TYPICAL OPERATION CIRCUIT

VCCVCCRPULL-UPSGM803 onlyRESET1SGM803/SGM809RESETMICROPROCESSORSYSTEMRESETSGM809-ZXN3L(only)GND23VCCSOT23-3(L-Type)GNDGND

Shengbang Microelectronics Co, Ltd

Tel: 86/451/84348461

REV. B

ORDERING INFORMATION

MODEL

RESET

THRESHOLD

(V)

4.63

4.38

3.08

2.93

2.63

2.32

4.63

4.38

4.00

SGM809

3.08

2.93

2.63

2.32

4.63

4.38

4.00

SGM810

3.08

2.93

2.63

2.32

SPECIFIED

TEMPERATURE

RANGE

ORDERING

NUMBER

PACKAGE

MARKING

PACKAGE

OPTION

SGM803

- 40°C to +125°C

SGM803-LXN3 803L

Tape and Reel, 3000SGM803-MXN3 803M

Tape and Reel, 3000SGM803-TXN3 803T

Tape and Reel, 3000SGM803-SXN3 803S

Tape and Reel, 3000SGM803-RXN3 803R

Tape and Reel, 3000SGM803-ZXN3 803Z

SGM809-MXN3 809M

SGM809-JXN3 809J

SGM809-TXN3 809T

SGM809-SXN3 809S

SGM809-RXN3 809R

SGM809-ZXN3 809Z

SGM809-ZXN3L 809ZL

SGM810-MXN3 810M

SGM810-JXN3 810J

SGM810-TXN3 810T

SGM810-SXN3 810S

SGM810-RXN3 810R

SGM810-ZXN3 810Z

Tape and Reel, 3000SGM810-LXN3 810L

Tape and Reel, 3000

2SGM803/809/810

ABSOLUTE MAXIMUM RATINGS

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

SOT23-3, θJA....................................................................... 250℃/W

–0.3 V to +6 V Operating - 40°C to +125°C

+150°C

RESET,

–0.3 V to VCC +0.3 V

- 65°C to +150°C

Input Current , .20 mA

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

Output Current, 20 mA

ESD Susceptibility

Rate of Rise, VCC .................................................................100 V/µs

4000V

Power Dissipation, PD @ TA = 25℃

MM..............................................................................................400V

SOT23-3 .....................................................................................0.4W

Package Thermal Resistance

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

NAME

Pin Number

SGM809-

SGM810SGM803 SGM809

ZXN3L

FUNCTION

GND 1 1 2 1 Ground

RESET 2 2 1 —

Active Low reset.

RESETremains low while VCC is below the reset

threshold, and remains low for 240 ms (typ) after VCC rises above the

reset threshold.

Active High reset. RESET

remains high while VCC is below the reset

RESET

VCC

— — — 2

threshold, and remains high for 240 ms (typ) after VCC rises above the

reset threshold.

3 3 3 3 Power supply voltage that is monitored.

3SGM803/809/810

ELECTRICAL 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.)

SUPPLY

Voltage

TA = 0°C to 70°C

TA = - 40°C to +125°C

VCC < 5.5 V, SGM8_L/M/J, TA = 25°C

Current

VCC < 5.5 V, SGM8_L/M/J, TA = - 40°C to +125°C

VCC < 3.6 V, SGM8_R/S/T/Z, TA = 25°C

VCC < 3.6 V, SGM8_R/S/T/Z, TA = - 40°C to +125°C

RESET VOLTAGE THRESHOLD

SGM8_L

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

SGM8_R

TA = - 40°C to +125°C

TA = 25°C

TA = - 40°C to +125°C

VCC = VTH to (VTH –100 mV)

TA = - 40°C to +85°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

4.63 4.723 V

1.0 5.5 V

1.2 5.5 V

20 30 µA

50 µA

17 25 µA

45 µA

PARAMETER CONDITIONS MIN TYP MAXUNITS

4.86 V

4.38 4.468 V

SGM8_M

4.56 V

4.00 4.08 V

SGM809J/SGM810J

4.2 V

3.08 3.157 V

SGM8_T

3.23 V

2.93 3.003 V

SGM8_S

3.08 V

2.63 2.696 V

2.76 V

2.32 2.378 V

SGM8_Z

RESET THRESHOLD

Temperature Coefficient

VCC to RESET/RESET Delay

Reset Active Timeout Period

2.42 V

ppm/°C

20 µs

160 240 560 ms

100 840 ms

RESET/RESET OUTPUT VOLTAGE

Low (SGM803R/S/T/Z)

Low (SGM809R/S/T/Z)

Low (SGM803L/M/J)

Low (SGM809L/M/J)

Low (SGM803R/S/T/L/M/J/Z)

Low (SGM809R/S/T/L/M/J/Z)

High (SGM809R/S/T/Z)

High (SGM809L/M/J)

Low (SGM810R/S/T/Z)

Low (SGM810L/M/J)

High (SGM810 R/S/T/L/M/J)

VCC = VTH(MIN), ISINK = 1.2mA 0.3

VCC = VTH(MIN), ISINK = 3.2mA 0.4

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

VCC > VTH, reset de-asserted

0.8×VCC

VCC– 1.5

0.8×VCC

0.3

0.4

µA

RESETOpen-Drain Output

Leakage Current (SGM803)

Specifications subject to change without notice.

４

SGM803/809/810

TYPICAL PERFORMANCE CHARACTERISTICS

Power-Down RESET Delay ature250SGM8_L/M/JVOD = VTH - VCC)Sµ200(

TVOD = 10mVESE150RVOD = 20mV

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

Power-Up RESET Delay ature264)262SGM809SSm(260

ETS258ER

256nwoD254-re252woP250248-50-30-110130Temperature(℃)

Normalized RESET Voltage Threshold ature1.008d1.006olhs1.004erh1.002TT1ESE0.998R0.996dez0.994ilam0.992roN0.990.988-50-30-110130Temperature(℃)

Power-Down RESET Delay ature300SGM8_T/S/R/ZVOD = VTH - VCC)S250VOD = 10mVµ(

TE200SER

n150VOD = 20mVwoD-100rewo= 100mVVOD = 200mVP50VOD0-50-30-110130

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

20tnVeCC = 3.6Vrru15C

ylp10puS50-50-30-110130Temperature(℃)

Maximum Transient Duration Without Causing aReset Pulse vs. RESET Comparator Overdrive)400Sµ(

350noita300ruD

250SGM8_L/M/Jtneis200nar150

Tmu100mixa50MSGM8_R/S/T/Z

RESET Comparator Overdrive

VTH - VCC(mV)

SGM803/809/810

５

TYPICAL PERFORMANCE CHARACTERISTICS

RESET Output Voltage vs. Supply VoltageSupply Voltage5VP-PvidRESET Output/VVoltage2SGM809RSGM809S200ms/div

６SGM803/809/810

APPLICATION NOTES

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 SGM803/

SGM809/SGM810 series can operate effectively even when

there are large degradations of the supply voltages. Another

advantage of the SGM803/ SGM809/SGM810 series is its very

accurate internal voltage reference circuit. These benefits

combine to produce an exceptionally reliable voltage monitor

circuit.

INTERFACING TO OTHER DEVICES’ OUTPUT

The SGM803/SGM809/SGM810 series is designed to integrate

with as many devices as possible and, therefore, has a

standard output dependent on VCC. This enables the parts to

be used in both 3 V and 5 V, or any nominal voltage within the

minimum and maximum specifications for VCC. This design

simplifies interfacing this device to other devices.

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 SGM803/SGM809/SGM810 can

easily be integrated into existing interrupt-handling circuits, as

shown in Figure 1, or can be used as a standalone device.

When VCC falls below 1.0 V, the SGM803/SGM809

RESETno

longer sinks current. A high impedance CMOS logic input

connected to

RESETmay, therefore, drift to undetermined logic

levels. To eliminate this problem, a 100kΩ resistor should be

connected fromRESETto ground.

ENSURING A VALID RESET OUTPUT DOWN TO

VCC = 0 V

VCCVCCSGM809RESETGND

PRIORITY ENCODER74LS1474-LINE BCD TO

MICROPROCESSORFigure 2. Ensuring a Valid Reset Output Down to VCC = 0V

VCCVCCSGM809RESETGNDOTHER SENSING

DEVICES

Figure 1. Interfacing to Microprocessors with Multiple

Interrupts

７SGM803/809/810

PACKAGE OUTLINE DIMENSIONS

SOT23-3

DbL0θ0.20SymbolDimensions Dimensions

In Millimeters In Inches

L 0.700REF 0.028REF

A2AL1 0.300

θ 0° 8° 0° 8°

８SGM803/809/810

REVISION HISTORY

Location Page

11/06— Data Sheet changed from REV. A to REV. B

Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Shengbang Microelectronics Co, Ltd

Unit 3, ChuangYe Plaza

No.5, TaiHu Northern Street, YingBin Road Centralized Industrial Park

Harbin Development Zone

Harbin, HeiLongJiang 150078

P.R. China

Tel.: 86-451-84348461

Fax: 86-451-84308461

９

SGM803/809/810

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