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Электронный компонент: STM809TWX6F

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1/18
November 2004
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 V
CC
= 1.0V
OPERATING TEMPERATURE:
40C to 85C (Industrial Grade)
LEAD-FREE, SMALL SOT23 and SOT143
PACKAGE
Table 1. Device Options
Figure 1. Packages
Active-
Low
RESET
Active-
High
RESET
Manual
RESET
Input
Package
STM809
SOT23-3
STM810
SOT23-3
STM811
SOT143-4
STM812
SOT143-4
SOT23-3 (WX)
SOT143-4 (W1)
STM809/810/811/812
2/18
TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 2. Logic Diagram (STM809/810) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 3. Logic Diagram (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 2. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 4. SOT23-3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 5. SOT143-4 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 6. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 7. Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Push-Button Reset Input (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Negative-Going V
CC
Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Valid /RST Output Down to V
CC
= 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 - V
OD
= V
TH
V
CC
(L/M). . . . . . . . . . . . . . . . 7
Figure 10.Power-down Reset Delay vs. Temperature - V
OD
= V
TH
V
CC
(R/S/T) . . . . . . . . . . . . . . 8
Figure 11.Power-up t
rec
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 14.AC Testing Input/Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 15.MR Timing Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 5. DC and AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
3/18
STM809/810/811/812
Table 8. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 9. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 10. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
STM809/810/811/812
4/18
SUMMARY DESCRIPTION
The STM809/810/811/812 MICROPROCESSOR
RESET Circuits are low-power supervisory devic-
es used to monitor power supplies. They perform
a single function: asserting a reset signal whenev-
er the V
CC
supply voltage drops below a preset
value and keeping it asserted until V
CC
has risen
above the preset threshold for a minimum period
of time (t
rec
). The STM811/812 also provide a
push-button reset input (MR).
Figure 2. Logic Diagram (STM809/810)
Note: 1. For STM810
Figure 3. Logic Diagram (STM811/812)
Note: 1. For STM812
Table 2. Signal Names
Note: 1. STM810/812 only
2. STM811/812 only
Figure 4. SOT23-3 Connections
Figure 5. SOT143-4 Connections
Figure 6. Block Diagram
Note: 1. STM811/812 only
2. RST for STM810/812
AI07832
V
CC
STM809/810
V
SS
RST (RST)
(1)
AI07831
V
CC
STM811/812
V
SS
RST (RST)
(1)
MR
V
SS
Ground
RST
Active-Low RESET Output
RST
(1)
Active-High RESET Output
V
CC
Supply Voltage
MR
(2)
Manual Reset Input
AI07833
2
3
1
RST (RST)
V
SS
(For STM810)
V
CC
AI07834
2
4
3
1
RST (RST)
V
SS
(For STM812)
V
CC
MR
AI07835
COMPARE
V
RST
V
CC
DEBOUNCE
t
rec
Generator
MR
(1)
RST
(2)
5/18
STM809/810/811/812
Figure 7. Hardware Hookup
Note: 1. STM809/811 only (RST for STM810/812)
2. STM811/812 only
AI07836
V
CC
V
SS
V
CC
MCU
STM809/810/
811/812
RST
(1)
Push-button
RESET
V
CC
MR
(2)
V
SS
RESET
Input