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STM809, STM810 STM811, STM812
Reset Circuit
FEATURES SUMMARY

PRECISION MONITORING OF 3V, 3.3V, and 5V SUPPLY VOLTAGES TWO OUTPUT CONFIGURATIONS - Push-pull RST Output (STM809/811) - Push-pull RST Output (STM810/812) 140ms RESET PULSE WIDTH (MIN) LOW SUPPLY CURRENT - 6A (TYP) GUARANTEED RST/RST ASSERTION DOWN TO VCC = 1.0V OPERATING TEMPERATURE: -40C to 85C (Industrial Grade) LEAD-FREE, SMALL SOT23 and SOT143 PACKAGE
Figure 1. Packages
SOT23-3 (WX)
Table 1. Device Options
ActiveLow RESET STM809 STM810 STM811 STM812 ActiveHigh RESET Manual RESET Input Package SOT23-3 SOT23-3 SOT143-4 SOT143-4
SOT143-4 (W1)
November 2004
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STM809/810/811/812
TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 2. Figure 3. Table 2. Figure 4. Figure 5. Figure 6. Figure 7. Logic Diagram (STM809/810) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Logic Diagram (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 SOT23-3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 SOT143-4 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Push-Button Reset Input (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Negative-Going VCC Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Valid /RST Output Down to VCC = 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 8. Supply Current vs. Temperature, L/M/R/S/T (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 9. Power-down Reset Delay vs. Temperature - VOD = VTH - VCC (L/M). . . . . . . . . . . . . . . . 7 Figure 10.Power-down Reset Delay vs. Temperature - VOD = VTH - VCC (R/S/T) . . . . . . . . . . . . . . 8 Figure 11.Power-up trec vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 12.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 13.Max Transient Duration NOT Causing Reset Pulse vs. Reset Comparator Overdrive . . . 9 MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 3. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 DC and AC PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 4. Operating and AC Measurement Conditions . . . . . Figure 14.AC Testing Input/Output Waveforms. . . . . . . . . . . Figure 15.MR Timing Waveform . . . . . . . . . . . . . . . . . . . . . . Table 5. DC and AC Characteristics . . . . . . . . . . . . . . . . . . ...... ...... ...... ...... ....... ....... ....... ....... ...... ...... ...... ...... ...... ...... ...... ...... . . . . 11 . . . . 11 . . . . 11 . . . . 12
PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 16.SOT23-3 - 3-lead Small Outline Transistor Package Outline . . . . . . . . . . . . . . . . . . . . . 13 Table 6. SOT23-3 - 3-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . . 13 Figure 17.SOT143-4 - 4-lead Small Outline Transistor Package Outline . . . . . . . . . . . . . . . . . . . . 14 Table 7. SOT143-4 - 4-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . 14 PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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Table 8. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 9. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 10. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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STM809/810/811/812
SUMMARY DESCRIPTION
The STM809/810/811/812 MICROPROCESSOR RESET Circuits are low-power supervisory devices used to monitor power supplies. They perform a single function: asserting a reset signal whenever the VCC supply voltage drops below a preset value and keeping it asserted until VCC has risen above the preset threshold for a minimum period of time (trec). The STM811/812 also provide a push-button reset input (MR).
Figure 2. Logic Diagram (STM809/810)
VCC
Table 2. Signal Names
VSS RST RST(1) Ground Active-Low RESET Output Active-High RESET Output Supply Voltage Manual Reset Input
STM809/810
RST (RST)(1)
VCC MR(2)
Note: 1. STM810/812 only 2. STM811/812 only
VSS
Note: 1. For STM810
AI07832
Figure 4. SOT23-3 Connections
VSS RST (RST) 1 2
3
VCC
Figure 3. Logic Diagram (STM811/812)
VCC
(For STM810)
AI07833
Figure 5. SOT143-4 Connections
MR STM811/812 RST (RST)
(1)
VSS RST (RST)
1 2
4 3
VCC MR
(For STM812) VSS
Note: 1. For STM812
AI07834 AI07831
Figure 6. Block Diagram
VCC VRST COMPARE trec Generator MR(1)
DEBOUNCE
AI07835
RST(2)
Note: 1. STM811/812 only 2. RST for STM810/812
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STM809/810/811/812
Figure 7. Hardware Hookup
VCC VCC STM809/810/ 811/812 MR(2) Push-button RESET VSS RST(1) VCC MCU RESET Input VSS
AI07836
Note: 1. STM809/811 only (RST for STM810/812) 2. STM811/812 only
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STM809/810/811/812
OPERATION
Reset Output The STM809/810/811/812 MICROPROCESSOR RESET CIRCUIT asserts a reset signal to the MCU whenever VCC goes below the reset threshold (VRST), or when the push-button reset input (MR) is taken low (see Figure 15., page 11). RST (active high for STM810/812) is guaranteed valid down to VCC = 1V (0 to 70C). During power-up, once VCC exceeds the reset threshold an internal timer keeps RST low for the reset time-out period, trec. After this interval, RST returns high. If VCC drops below the reset threshold, RST goes low. Each time RST is asserted, it stays low for at least the reset time-out period. Any time VCC goes below the reset threshold, the internal timer clears. The reset timer starts when VCC returns above the reset threshold. The active-low reset (RST) and active-high reset (RST) both source and sink current. Push-Button Reset Input (STM811/812) A logic low on MR asserts RST. RST remains asserted while MR is low, and for trec after it returns high. The MR input has an internal 20k pull-up resistor, allowing it to be left open if not used. This input can be driven with TTL/CMOS-logic levels or with open-drain/collector outputs. Connect a normally open push-button switch from MR to GND to create a manual reset function; external debounce circuitry is not required. If the device is used in a noisy environment, connect a 0.1F capacitor from MR to GND to provide additional noise immunity. Negative-Going VCC Transients The STM809/810/811/812 are relatively immune to negative-going VCC transients (glitches). Figure 13., page 9 shows typical transient duration versus reset comparator overdrive (for which the STM809/810/811/812 will NOT generate a reset pulse). The graph was generated using a negative pulse applied to VCC, starting at 0.5V above the actual reset threshold and ending below it by the magnitude indicated (comparator overdrive). The graph indicates the maximum pulse width a negative VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (further below the threshold), the maximum allowable pulse width decreases. Any combination of duration and overdrive which lies under the curve will NOT generate a reset signal. Typically, a VCC transient that goes 100mV below the reset threshold and lasts 20s or less will not cause a reset pulse. A 0.1F bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. Valid /RST Output Down to VCC = 0V When VCC falls below 1V, the RST (STM809/811) output no longer sinks current, but becomes an open circuit. In most systems this is not a problem, as most MCUs do not operate below 1V. However, in applications where RST output must be valid down to 0V, a pull-down resistor may be added to hold the RST output low. This resistor must be large enough to not load the RST output, and still be small enough to pull the output to ground. A 100K resistor is recommended. Note: The same situation applies for the activehigh RST of the STM810/812. A 100K pull-up resistor to VCC should be used if RST must remain valid for VCC < 1.0V.
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STM809/810/811/812
TYPICAL OPERATING CHARACTERISTICS
Note: Typical values are at TA = 25C, VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, and VCC = 3.0V for R versions. Figure 8. Supply Current vs. Temperature, L/M/R/S/T (no load)
8.0
6.0 Supply Current (A)
4.0
1V 3V 3.6V 5.5V
2.0
0.0 -40
-20
0
20 Temperature (C)
40
60
80
AI07879
Figure 9. Power-down Reset Delay vs. Temperature - VOD = VTH - VCC (L/M)
140.00 120.00 100.00 80.00 60.00 40.00 20.00 0.00 -40
VOD = 20mV VOD = 125mV VOD = 200mV
Power-Down Reset Delay (s)
-20
0
20 Temperature (C)
40
60
80
AI07880
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STM809/810/811/812
Figure 10. Power-down Reset Delay vs. Temperature - VOD = VTH - VCC (R/S/T)
100.00
Power-Down Reset Delay (s)
80.00
60.00
VOD = 20mV VOD = 125mV VOD = 200mV
40.00
20.00
0.00 -40
-20
0
20 Temperature (C)
40
60
80
AI07878
Figure 11. Power-up trec vs. Temperature
250.00
240.00 Power-up trec (ms)
230.00
L/M R/S/T
220.00
210.00
200.00 -40
-20
0
20 Temperature (C)
40
60
80
AI07881
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STM809/810/811/812
Figure 12. Normalized Reset Threshold vs. Temperature
1.003 1.002 1.001 1.000
Normalized Treshold
0.999 0.998 0.997 0.996 0.995 0.994 0.993 -40 -20 0 20 Temperature (C)
AI07882 L/M R/S/T
40
60
80
Figure 13. Max Transient Duration NOT Causing Reset Pulse vs. Reset Comparator Overdrive
700.00 600.00 Maximum Transient Duration (s) 500.00 400.00
R/S/T L/M
300.00 200.00 100.00 0.00
1
10
100
1000
AI07883
Reset Comparator Overdrive, VRST - VCC (mV)
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STM809/810/811/812
MAXIMUM RATING
Stressing the device above the rating listed in the Absolute Maximum Ratings" table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not imTable 3. Absolute Maximum Ratings
Symbol TSTG TSLD(1) VIO VCC IO PD Parameter Storage Temperature (VCC Off) Lead Solder Temperature for 10 seconds Input or Output Voltage Supply Voltage Output Current Power Dissipation Value -55 to 150 260 -0.3 to VCC +0.3 -0.3 to 7.0 20 320 Unit C C V V mA mW
plied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents.
Note: 1. Reflow at peak temperature of 255C to 260C for < 30 seconds (total thermal budget not to exceed 180C for between 90 to 150 seconds).
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STM809/810/811/812
DC AND AC PARAMETERS
This section summarizes the operating measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and AC characteristics Tables that follow, are derived from tests performed under the Measurement Conditions summarized in Table 4., Operating and AC Measurement Conditions. Designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters.
Table 4. Operating and AC Measurement Conditions
Parameter VCC Supply Voltage Ambient Operating Temperature (TA) Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages STM809/810/811/812 1.0 to 5.5 -40 to 85 5 0.2 to 0.8VCC 0.3 to 0.7VCC Unit V C ns V V
Figure 14. AC Testing Input/Output Waveforms
0.8VCC
0.7VCC 0.3VCC
AI02568
0.2VCC
Figure 15. MR Timing Waveform
MR tMLRL RST
(1)
tMLMH
trec
AI07837a
Note: 1. RST for STM810/812
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STM809/810/811/812
Table 5. DC and AC Characteristics
Sym VCC ICC VIH VIL Alternative Description Operating Voltage Test Condition(1) TA = -40 to +85C TA = 0 to +70C VCC < 3.6V VCC < 5.5V VCC > VRST (max), STM8XXL/M VCC > VRST (max), STM8XXR/S/T VCC > VRST (max), STM8XXL/M VCC > VRST (max), STM8XXR/S/T STM8XXR/S/T only, IOL = 1.2mA VCC = VRST (min) STM8XXL/M only, IOL = 3.2mA VCC = VRST (min) IOL = 50A; VCC > 1.0V STM8XXR/S/T only, IOH = 500A STM8XXL/M only, IOH = 800A IOH = 150A, 1.8V < VCC < VRST (min) 25C -40 to 85C 25C -40 to 85C 25C -40 to 85C 25C -40 to 85C 25C -40 to 85C 0.8VCC 0.8VCC 0.8VCC 2.2 0.7VCC 0.8 0.25VCC 0.3 0.4 0.3 Min 1.2 1.0 5.5 7 Typ Max 5.5 5.5 10 15 Unit V V A A V V V V V V V V V V
VCC Supply Current
MR Input High Voltage
MR Input Low Voltage
VOL
RST Output Low Voltage (Active High(2) or Low) RST Output Low Voltage RST Output High Voltage
VOL
VOH RST Output High Voltage RESET Thresholds
STM8XXL STM8XXM VRST Reset Threshold STM8XXT STM8XXS STM8XXR VRST Temperature Coefficient VCC to RST Delay Push-Button RESET Input tMLMH tMLRL tMR tMRD MR Pulse Width MR to RST Output Delay(3) MR Glitch Immunity(4) MR Pull-up Resistance trec
Note: 1. 2. 3. 4.
4.56 4.50 4.31 4.25 3.04 3.00 2.89 2.85 2.59 2.55
4.63 4.38 3.08 2.93 2.63
4.70 4.75 4.45 4.50 3.11 3.15 2.96 3.00 2.66 2.70
V V V V V V V V V V ppm/ C s s
VCC = 3.3V VCC = VRST to (VRST - 100mV) STM8XXL/M STM8XXR/S/T
45 40 20
10 0.5 100 10 140 20 210 30 280
s s ns k ms
RST Pulse Width
Valid for Ambient Operating Temperature: TA = -40 to 85C; VCC = 1.2V to 5.5V (except where noted). For Active High (RST); VCC = VRST (max) RST output for STM810/812 "Glitches" of 100ns or less typically will not generate a RESET pulse.
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STM809/810/811/812
PACKAGE MECHANICAL
Figure 16. SOT23-3 - 3-lead Small Outline Transistor Package Outline
E E1
B 0.15
M
CAB
A1
1
e e1 D
0.20
M
CAB A
3X
0.10 C C
A2 A
3X b C
L1 L
SOT23-3
C
Note: Drawing is not to scale.
Table 6. SOT23-3 - 3-lead Small Outline Transistor Package Mechanical Data
mm Symbol Typ A A1 A2 b C D E E1 e e1 L L1 N 0.54 0.40 0 3 0.60 8 Min 0.89 0.01 0.88 0.30 0.08 2.80 2.10 1.20 0.89 1.78 Max 1.12 0.10 1.02 0.50 0.20 3.04 2.64 1.40 1.03 2.05 0.021 0.016 0 3 0.024 8 Typ Min 0.035 0.001 0.035 0.012 0.003 0.110 0.083 0.047 0.035 0.070 Max 0.044 0.004 0.042 0.020 0.008 0.120 0.104 0.055 0.041 0.081 inches
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STM809/810/811/812
Figure 17. SOT143-4 - 4-lead Small Outline Transistor Package Outline
E E1
B 0.15
M
CAB
A1
1
e1
e/2 e D
0.15
M
CAB
b2
0.20
M
CAB A
4X
C 0.10 C
A2 A
3X b C
L1 L
SOT143-4
C
Note: Drawing is not to scale.
Table 7. SOT143-4 - 4-lead Small Outline Transistor Package Mechanical Data
mm Symbol Typ A A1 A2 b b2 C D E E1 e e1 L L1 N 1.92 0.20 0.55 0.40 0 4 0.60 10 Min 0.89 0.01 0.88 0.37 0.76 0.09 2.80 2.10 1.20 Max 1.12 0.10 1.02 0.51 0.94 0.18 3.04 2.64 1.40 0.076 0.008 0.022 0.016 0 4 0.024 10 Typ Min 0.035 0.001 0.035 0.015 0.030 0.004 0.110 0.083 0.047 Max 0.044 0.004 0.042 0.020 0.037 0.007 0.120 0.104 0.055 inches
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STM809/810/811/812
PART NUMBERING
Table 8. Ordering Information Scheme
Example: STM8XX L WX 6 F
Device Type STM8XX
Reset Threshold Voltage L = VRST = 4.50V to 4.75V M = VRST = 4.25V to 4.50V T = VRST = 3.00V to 3.15V S = VRST = 2.85V to 3.00V R = VRST = 2.55V to 2.70V
Package WX = SOT23-3 (STM809, STM810) W1 = SOT143-4 (STM811, STM812)
Temperature Range 6 = -40 to 85C
Shipping Method F = Pb-Free Package (ECO PACK(R)), Tape & Reel
For a list of available options (e.g., Speed, Package) or for further information on any aspect of this device, please contact the ST Sales Office nearest to you.
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STM809/810/811/812
Table 9. Marking Description
Part Number STM809L STM809M STM809T STM809S STM809R STM810L STM810M STM810T STM810S STM810R STM811L STM811M STM811T STM811S STM811R STM812L STM812M STM812T STM812S STM812R Reset Threshold 4.63V 4.38V 3.08V 2.93V 2.63V 4.63V 4.38V 3.08V 2.93V 2.63V 4.63V 4.38V 3.08V 2.93V 2.63V 4.63V 4.38V 3.08V 2.93V 2.63V Output Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Push-Pull RST Topside Marking 8AAx 8ABx 8ACx 8ADx 8AEx 8AFx 8AGx 8AHx 8AJx 8AKx 8ALx 8AMx 8ANx 8APx 8AQx 8ARx 8ASx 8ATx 8AUx 8AVx
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REVISION HISTORY
Table 10. Document Revision History
Date 02-Sep-03 03-Oct-03 16-Oct-03 17-Nov-03 04-Dec-03 09-Dec-03 10-Feb-04 19-Nov-04 Version 1.0 1.1 1.2 1.3 2.0 2.1 3.0 4.0 First Issue Update Operating Characteristics (Figure 8, 9, 10, 11, 12, 13) Update characteristics (Table 5); modify illustration (Figure 13) Modified with JEDEC timing symbols (Figure 15; Table 5) Reformatted; promoted; updated (Figure 15; Table 5, 6) Correct timing label, combine characteristics (Figure 11; Table 5) Clarify package; update DC Characteristics (Table 5, 8) Update dimensions (Table 6) Revision Details
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STM809/810/811/812
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2004 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
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