SGM811

SGM811 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 www.sg-micro.com

Nov 2006

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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 X 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 X KA4 2.32 SOT143-4

- 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C - 40°C to +125°C

Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000 Tape and Reel, 3000

2

SGM811/812

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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.) 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 V V 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 ns 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_L/M/J VCC > VTH(MAX), SGM81_R/S/T/Z VCC > VTH(MAX), SGM81_R/S/T/Z 1 MΩ 2.3 0.8 0.25×VCCV V V V 0.7×VCC

3

SGM811/812

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ELECTRICAL 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 V V V V V V V V 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 0.3 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)

VCC................................................................................–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, RESET..................................................................... 20 mA Power Dissipation, PD @ TA = 25℃

SOT23-5 .....................................................................................0.4W SOT143-4.................................................................................. 0.32W Operating Temperature Range...........................- 40°C to +125°C Junction Temperature...........................................................+150°C Storage Temperature.............................................- 65°C to +150°C Lead Temperature (soldering, 10s).....................................+260°C 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.

PIN DESCRIPTION

Pin Number NAME GND SGM811 SGM812 SOT143-4 SOT23-5 SOT143-4 1 1 1 Ground FUNCTION NC RESETNo connect. 2 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. 4

SGM811/812

TYPICAL PERFORMANCE CHARACTERISTICS

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Power-Down RESET Delay vs.Temperature250SGM811L/M/JVOD = VTH - VCC)Sµ200( TVOD = 10mVESE150RVOD = 20mV nwo100D-rewo50VOD = 100mVVOD = 200mVP0-50-30-101030507090110130Temperature(℃)

Power-Up RESET Delay vs.Temperature264)262SGM811SSm(260 TES258ER 256nwo254D-re252woP250248-50-30-101030507090110130Temperature(℃)

Normalized RESET Voltage Threshold vs.Temperature1.008dl1.006ohs1.004erh1.002TT1ESE0.998R0.996dez0.994ilam0.992roN0.990.988-50-30-101030507090110130Temperature(℃)

Power-Down RESET Delay vs.Temperature300SGM811T/S/RVOD = VTH - VCC)S250VOD = 10mVµ( TE200SER n150VOD = 20mVwoD-100rewoVOD = 200mVP50VOD= 100mV0-50-30-101030507090110130

Temperature(℃)Supply Current vs. Temperature (No Load)3025VCC = 5.5V)Aµ( 20tnVeCC = 3.6Vrru15C ylp10puS50-50-30-101030507090110130

Temperature(℃)

Maximum Transient Duration Without Causing aReset Pulse vs. RESET Comparator Overdrive400)Sµ( 350noita300ruD 250SGM811L/M/Jtneis200narT150 mu100mixa50MSGM811T/S/R01101001000RESET Comparator Overdrive

, VTH - VCC(mV)

SGM811/812

５

TYPICAL PERFORMANCE CHARACTERISTICS

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

６ SGM811/812

APPLICATION NOTES

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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.

VCC

VREFVREFVVREFREFRESETt1t1t

1= 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

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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 A

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

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SGM811/812

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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

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SGM811/812