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SGM803 SGM809 SGM810
GENERAL DESCRIPTION
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. The RESET 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 17A makes the SGM803/SGM809/SGM810 ideal for use in portable, battery operated equipment. They are available in the 3-pin SOT23 package.
Microprocessor Supervisory Circuit in 3-Pin SOT23
FEATURES
- 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 (17A Typ) - Reset Assertion Down to 1 V VCC - 160 ms Min Power-On Reset Open-Drain RESET Output(SGM803) Push-Pull RESET Output (SGM809) Push-Pull RESET Output (SGM810) - Compact 3-Pin SOT23 Package
PIN CONFIGURATIONSTOP VIEW
APPLICATIONS
Microprocessor Systems Controllers Intelligent Instruments Automotive Systems Safety Systems Portable Instruments
GND 1
SGM803 SGM809 SGM810
RESET/RESET 2
3
VCC
SOT23-3
TYPICAL OPERATION CIRCUIT
RESET
VCC VCC
RPULL-UP SGM803 only
1
SGM803/SGM809
RESET
MICROPROCESSOR SYSTEM RESET
SGM809ZXN3L (only)
GND 2
3
VCC
SOT23-3(L-Type)
GND GND
Shengbang Microelectronics Co, Ltd Tel: 86/451/84348461 www.sg-micro.com
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 2.32 4.63 4.38 4.00 SGM810 3.08 2.93 2.63 2.32 SPECIFIED TEMPERATURE RANGE ORDERING NUMBER SGM803-LXN3 SGM803-MXN3 SGM803-TXN3 SGM803-SXN3 SGM803-RXN3 SGM803-ZXN3 SGM809-LXN3 SGM809-MXN3 SGM809-JXN3 SGM809-TXN3 SGM809-SXN3 SGM809-RXN3 SGM809-ZXN3 SGM809-ZXN3L SGM810-LXN3 SGM810-MXN3 SGM810-JXN3 SGM810-TXN3 SGM810-SXN3 SGM810-RXN3 SGM810-ZXN3 PACKAGE MARKING 803L 803M 803T 803S 803R 803Z 809L 809M 809J 809T 809S 809R 809Z 809ZL 810L 810M 810J 810T 810S 810R 810Z PACKAGE OPTION
SGM803
- 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C - 40C to +125C
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
SGM803/809/810
ABSOLUTE MAXIMUM RATINGS
(Typical values are at TA = 25C, unless otherwise noted.) VCC................................................................................-0.3 V to +6 V RESET, RESET ...............................................-0.3 V to VCC +0.3 V Input Current , VCC.................................................................20 mA Output Current, RESET, RESET ......................................... 20 mA Rate of Rise, VCC .................................................................100 V/s Power Dissipation, PD @ TA = 25 SOT23-3 .....................................................................................0.4W Package Thermal Resistance SOT23-3, JA....................................................................... 250/W Operating Temperature Range...........................- 40C to +125C Junction Temperature...........................................................+150C Storage Temperature.............................................- 65C to +150C Lead Temperature (soldering, 10s).....................................+260C 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
NAME GND SGM803 1 2 Pin Number SGM809 SGM809 ZXN3L 1 2 2 1 SGM810 1 -- Ground Active Low reset. RESET remains 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 -- -- -- 2 threshold, and remains high for 240 ms (typ) after VCC rises above the reset threshold. VCC 3 3 3 3 Power supply voltage that is monitored. FUNCTION
RESET
3
SGM803/809/810
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.)
PARAMETER SUPPLY TA = 0C to 70C Voltage TA = - 40C to +125C VCC < 5.5 V, SGM8_L/M/J, TA = 25C VCC < 5.5 V, SGM8_L/M/J, TA = - 40C to +125C Current VCC < 3.6 V, SGM8_R/S/T/Z, TA = 25C VCC < 3.6 V, SGM8_R/S/T/Z, TA = - 40C to +125C RESET VOLTAGE THRESHOLD TA = 25C SGM8_L TA = - 40C to +125C TA = 25C SGM8_M TA = - 40C to +125C TA = 25C SGM809J/SGM810J TA = - 40C to +125C TA = 25C SGM8_T TA = - 40C to +125C TA = 25C SGM8_S TA = - 40C to +125C TA = 25C SGM8_R TA = - 40C to +125C TA = 25C SGM8_Z RESET THRESHOLD Temperature Coefficient VCC to RESET/ RESET Delay Reset Active Timeout Period VCC = VTH to (VTH -100 mV) TA = - 40C to +85C 160 100 TA = - 40C to +125C 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 30 20 240 560 840 2.32 2.63 2.93 3.08 4.00 4.38 4.63 4.723 4.86 4.468 4.56 4.08 4.2 3.157 3.23 3.003 3.08 2.696 2.76 2.378 2.42 V V V V V V V V V V V V V V ppm/C s ms ms 17 1.0 1.2 20 5.5 5.5 30 50 25 45 V V A A A A CONDITIONS MIN TYP MAX UNITS
TA = - 40C to +125C
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 V
VCC = VTH(MIN), ISINK = 3.2mA
0.4
V
VCC > 1.0 V, ISINK = 50A VCC > VTH(MAX), ISOURCE = 500A VCC > VTH(MAX), ISOURCE = 800A VCC = VTH(MAX), ISINK = 1.2mA VCC = VTH(MAX), ISINK = 3.2mA 1.8 V < VCC < VTH(MIN), ISOURCE = 150A VCC > VTH, reset de-asserted 0.8xVCC 0.8xVCC VCC- 1.5
0.3
V V V
0.3 0.4
V V V
RESET Open-Drain Output
Leakage Current (SGM803)
1
A
Specifications subject to change without notice.
SGM803/809/810
TYPICAL PERFORMANCE CHARACTERISTICS
Power-Down RESET Delay vs.Temperature
250 SGM8_L/M/J VOD = VTH - VCC VOD = 10mV 150 100 50 0 -50 -30 -10 10 30 50 70 90 110 130 VOD = 100mV VOD = 200mV VOD = 20mV
Power-Down RESET Delay vs.Temperature
300 SGM8_T/S/R/Z VOD = VTH - VCC VOD = 10mV
Power-Down RESET (S)
200
Power-Down RESET (S)
250 200 150 100 50 0 -50 -30 -10
VOD = 20mV
VOD = 100mV
VOD = 200mV
10
30
50
70
90
110 130
Temperature()
Temperature()
Supply Current vs. Temperature (No Load)
30 25 VCC = 5.5V
Power-Up RESET Delay vs.Temperature
264 262 260 258 256 254 252 250 248 -50 -30 -10 10 30 50 70 90 110 130 SGM809S
Power-Down RESET (mS)
Supply Current (A)
20 15 10 5 0 -50 -30 -10 10 30 50 70
VCC = 3.6V
90
110 130
Temperature()
Temperature()
Normalized RESET Voltage Threshold vs. Temperature Normalized RESET Threshold
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 90 110 130
Maximum Transient Duration Without Causing a Reset Pulse vs. RESET Comparator Overdrive Maximum Transient Duration (S)
400 350 300 250 200 150 100 50 0 1 10 100 1000 SGM8_R/S/T/Z SGM8_L/M/J
1.008
Temperature()
RESET Comparator Overdrive, VTH - VCC(mV)
SGM803/809/810
TYPICAL PERFORMANCE CHARACTERISTICS
RESET Output Voltage vs. Supply Voltage
Supply Voltage 5VP-P
2V/div
RESET Output Voltage
SGM809R
SGM809S
200ms/div
SGM803/809/810
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.
ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0 V
When VCC falls below 1.0 V, the SGM803/SGM809 RESET no longer sinks current. A high impedance CMOS logic input connected to RESET may, therefore, drift to undetermined logic levels. To eliminate this problem, a 100k resistor should be connected from RESET to ground.
VCC
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.
VCC
SGM809
RESET GND
PRIORITY ENCODER 74LS147
4-LINE BCD TO MICROPROCESSOR
Figure 2. Ensuring a Valid Reset Output Down to VCC = 0V
VCC
VCC
SGM809
RESET GND
OTHER SENSING DEVICES
Figure 1. Interfacing to Microprocessors with Multiple Interrupts
SGM803/809/810
PACKAGE OUTLINE DIMENSIONS
SOT23-3
D b L
0
0.20
Symbol
A A1
Dimensions In Millimeters Min
1.050 0.000 1.050 0.300 0.100 2.820 1.500 2.650 1.800 0.300 0
Dimensions In Inches Min
0.041 0.000 0.041 0.012 0.004 0.111 0.059 0.104 0.071 0.012 0
Max
1.250 0.100 1.150 0.400 0.200 3.020 1.700 2.950 2.000 0.600 8
Max
0.049 0.004 0.045 0.016 0.008 0.119 0.067 0.116 0.079 0.024 8
E1
A2 b c D E
E
e e1 A1 C
L
E1 e e1 L
0.950TYP 0.700REF
0.037TYP 0.028REF
A2
A
L1
SGM803/809/810
REVISION HISTORY
Location
11/06-- Data Sheet changed from REV. A to REV. B
Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Page
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 www.sg-micro.com
SGM803/809/810

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