STM690A, STM692A, STM703
STM704, STM802, STM805, STM817/8/9
5V Supervisor with Battery Switchover
FEATURES SUMMARY
■
■
■
■
■
■
■
■
■
■
■
■
■
5V OPERATING VOLTAGE
NVRAM SUPERVISOR FOR EXTERNAL
LPSRAM
CHIP-ENABLE GATING (STM818 only) FOR
EXTERNAL LPSRAM (7ns max PROP
DELAY)
RST AND RST OUTPUTS
200ms (TYP) t
rec
WATCHDOG TIMER - 1.6sec (TYP)
AUTOMATIC BATTERY SWITCHOVER
LOW BATTERY SUPPLY CURRENT - 0.4µA
(TYP)
POWER-FAIL COMPARATOR (PFI/PFO)
LOW SUPPLY CURRENT - 40µA (TYP)
GUARANTEED RST (RST) ASSERTION
DOWN TO V
CC
= 1.0V
OPERATING TEMPERATURE:
–40°C to 85°C (Industrial Grade)
RoHS COMPLIANCE
Lead-free components are compliant with the
RoHS Directive.
Figure 1. Packages
8
1
SO8 (M)
TSSOP8 3x3 (DS)*
Table 1. Device Options
Watchdog
Input
STM690A
STM692A
STM703
STM704
STM802L/M
STM805L
STM817L/M
STM818L/M
STM819L/M
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
Active-
Low
RST
(1)
✔
✔
✔
✔
✔
✔
✔
✔
Active-
High
RST
(1)
Manual
Reset
Input
Battery
Switch-
over
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
Power-fail
Comparator
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
Chip-
Enable
Gating
Battery
Freshness
Seal
Note: 1. All RST and RST outputs are push-pull.
* Contact local ST sales office for availability.
Rev 7.0
January 2006
1/37
STM690A/692A/703/704/802/805/817/818/819
TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 2. Logic Diagram (STM690A/692A/802/805/817) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 3. Logic Diagram (STM703/704/819). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 4. Logic Diagram (STM818). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 2. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 5. STM690A/692A/802/805/817 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 6. STM703/704/819 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 7. STM818 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 8. Block Diagram (STM690A/692A/802/805/817) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 9. Block Diagram (STM703/704/819) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 10.Block Diagram (STM818) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 11.Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Push-button Reset Input (STM703/704/819) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Watchdog Input (NOT available on STM703/704/819) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Back-up Battery Switchover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 4. I/O Status in Battery Back-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chip-Enable Gating (STM818 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chip Enable Input (STM818 only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chip Enable Output (STM818 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 12.Chip-Enable Gating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 13.Chip Enable Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power-fail Input/Output (NOT available on STM818) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 14.Power-fail Comparator Waveform (STM817/818/819) . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 15.Power-fail Comparator Waveform (STM690A/692A/703/704/802/805) . . . . . . . . . . . . . 13
Using a SuperCap™ as a Backup Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Negative-Going V
CC
Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Battery Freshness Seal (STM817/818/819) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 16.Using a SuperCap™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 17.Freshness Seal Enable Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 18.V
CC
-to-V
OUT
On-Resistance vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 19.V
BAT
-to-V
OUT
On-Resistance vs. Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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STM690A/692A/703/704/802/805/817/818/819
Figure 20.Supply Current vs. Temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 21.Battery Current vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 22.V
PFI
Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 23.Reset Comparator Propagation Delay vs. Temperature (Other than STM817/818/819) 17
Figure 24.Reset Comparator Propagation Delay vs. Temperature (V
BAT
=3.0V; STM817/818/819)18
Figure 25.Power-up t
rec
vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 26.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 27.Watchdog Time-out Period vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 28.E to E
CON
On-Resistance vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 29.PFI to PFO Propagation Delay vs. Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 30.Output Voltage vs. Load Current (V
CC
= 5V; V
BAT
= 2.8V; T
A
= 25°C). . . . . . . . . . . . . . 21
Figure 31.Output Voltage vs. Load Current (V
CC
= 0V; V
BAT
= 2.8V; T
A
= 25°C). . . . . . . . . . . . . . 21
Figure 32.RST Output Voltage vs. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 33.RST Output Voltage vs. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 34.RST Response Time (Assertion). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 35.RST Response Time (Assertion). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 36.Power-fail Comparator Response Time (Assertion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 37.Power-fail Comparator Response Time (De-Assertion) . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 38.Maximum Transient Duration vs. Reset Threshold Overdrive. . . . . . . . . . . . . . . . . . . . . 25
Figure 39.E to E
CON
Propagation Delay vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 5. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
DC and AC PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 6. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . .
Figure 40.E to ECON Propagation Delay Test Circuit. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 41.AC Testing Input/Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 42.MR Timing Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 43.Watchdog Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 7. DC and AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
......
......
......
......
......
......
. . . . 27
. . . . 28
. . . . 28
. . . . 28
. . . . 28
. . . . 29
PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 44.SO8 – 8-lead Plastic Small Outline, 150 mils body width, Package Mech. Drawing. . . . 32
Table 8. SO8 – 8-lead Plastic Small Outline, 150 mils body width, Package Mechanical Data . . 32
Figure 45.TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Outline . . . . . . . . . . . 33
Table 9. TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Mechanical Data . . . . 33
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 10. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 11. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 12. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3/37
STM690A/692A/703/704/802/805/817/818/819
SUMMARY DESCRIPTION
The STM690A/692A/703/704/802/805/817/818/
819 Supervisors are self-contained devices which
provide microprocessor supervisory functions with
the ability to non-volatize and write-protect exter-
nal LPSRAM. A precision voltage reference and
comparator monitors the V
CC
input for an out-of-
tolerance condition. When an invalid V
CC
condi-
tion occurs, the reset output (RST) is forced low
(or high in the case of RST). These devices also
offer a watchdog timer (except for STM703/704/
819) as well as a power-fail comparator (except for
STM818) to provide the system with an early
warning of impending power failure.
These devices are available in a standard 8-pin
SOIC package or a space-saving 8-pin TSSOP
package.
Figure 2. Logic Diagram (STM690A/692A/802/
805/817)
V
CC
V
BAT
Figure 4. Logic Diagram (STM818)
V
CC
V
BAT
V
OUT
V
OUT
WDI
PFI
STM690A/
692A/802/
805/817
RST(RST)
(1)
PFO
WDI
STM818
E
E
CON
RST
V
SS
V
SS
Note: 1. For STM805, reset output is active-high.
AI07894
AI07896
Table 2. Signal Names
MR
WDI
Push-button Reset Input
Watchdog Input
Active-Low Reset Output
Active-High Reset Output
Chip Enable Input
Conditioned Chip Enable Output
Supply Voltage Output
Supply Voltage
Back-up Supply Voltage
Power-fail Input
Power-fail Output
Ground
Figure 3. Logic Diagram (STM703/704/819)
V
CC
V
BAT
RST
RST
V
OUT
MR
PFI
STM703/
704/819
RST
PFO
E
(1)
E
CON(1)
V
OUT
V
CC
V
SS
V
BAT
AI07895
PFI
PFO
V
SS
Note: 1. STM818
4/37
STM690A/692A/703/704/802/805/817/818/819
Figure 5. STM690A/692A/802/805/817
Connections
SO8/TSSOP8
V
OUT
V
CC
V
SS
PFI
1
2
3
4
8
7
6
5
V
BAT
RST(RST)
(1)
WDI
PFO
AI07889
Figure 6. STM703/704/819 Connections
SO8/TSSOP8
V
OUT
V
CC
V
SS
PFI
1
2
3
4
8
7
6
5
V
BAT
RST
MR
PFO
AI07890
Note: 1. For STM805, reset output is active-high.
Figure 7. STM818 Connections
SO8/TSSOP8
V
OUT
V
CC
V
SS
E
1
2
3
4
8
7
6
5
V
BAT
RST
WDI
E
CON
AI07892
5/37
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