STM705, STM706 STM707, STM708, STM813L
5 V supervisor
Features
■5 V operating voltage
■Precision VCC monitor
– STM705/707/813L
– |
4.50 V ≤ VRST ≤ 4.75 V |
– |
STM706/708 |
– |
4.25 ≤ VRST ≤ 4.50 V |
■RST and RST outputs
■200 ms (typ) trec
■Watchdog timer - 1.6 s (typ)
■Manual reset input (MR)
■Power-fail comparator (PFI/PFO)
■Low supply current - 40 µA (typ)
■Guaranteed RST (RST) assertion down to VCC = 1.0 V
■Operating temperature: –40 °C to 85 °C (industrial grade)
■RoHS compliance
–Lead-free components are compliant with the RoHS directive
8
1
SO8 (M)
TSSOP8 3x3 (DS)(1)
1. Contact local ST sales office for availability.
Table 1. |
Device summary |
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Watchdog |
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Watchdog |
Active-low |
Active-high |
Manual reset |
Power-fail |
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input |
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output(1) |
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(1) |
RST(1) |
input |
comparator |
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RST |
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STM705 |
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STM706 |
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STM707 |
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STM708 |
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STM813L |
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1. Push-pull output
August 2010 |
Doc ID 10520 Rev 9 |
1/33 |
www.st.com
Contents |
STM705, STM706, STM707, STM708, STM813L |
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Contents
1 |
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 5 |
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2 |
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
8 |
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2.1 |
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MR |
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2.2 |
WDI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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2.3 |
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WDO |
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2.4 |
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RST |
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2.5 |
RST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
8 |
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2.6 |
PFI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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2.7 |
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PFO |
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3 |
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
11 |
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3.1 |
Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
11 |
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3.2 |
Push-button reset input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
11 |
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3.3 |
Watchdog input (STM705/706/813L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
11 |
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3.4 |
Watchdog output (STM705/706/813L) . . . . . . . . . . . . . . . . . . . . . . . . . . . |
12 |
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3.5 |
Power-fail input/output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
12 |
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3.6 |
Ensuring a valid reset output down to VCC = 0 V . . . . . . . . . . . . . . . . . . . |
12 |
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3.7 |
Interfacing to microprocessors with bidirectional reset pins . . . . . . . . . . . |
13 |
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Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
30 |
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9 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
31 |
2/33 |
Doc ID 10520 Rev 9 |
STM705, STM706, STM707, STM708, STM813L |
List of tables |
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List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 5. Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 6. DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table 7. SO8 - 8-lead plastic small outline, 150 mils body width, pack. mech. data . . . . . . . . . . . . 28 Table 8. TSSOP8 - 8-lead, thin shrink small outline, 3 x 3 mm body size, mechanical data . . . . . . 29 Table 9. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Table 10. Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Table 11. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Doc ID 10520 Rev 9 |
3/33 |
List of figures |
STM705, STM706, STM707, STM708, STM813L |
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List of figures
Figure 1. |
Logic diagram (STM705/706/813L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 5 |
Figure 2. |
Logic diagram (STM707/708) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 5 |
Figure 3. |
STM705/706/813L SO8 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
6 |
Figure 4. |
STM705/706/813L TSSOP8 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
6 |
Figure 5. |
STM707/708 SO8 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
7 |
Figure 6. |
STM707/708 TSSOP8 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
7 |
Figure 7. |
Block diagram (STM705/706/813L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
9 |
Figure 8. |
Block diagram (STM707/708) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
10 |
Figure 9. |
Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
10 |
Figure 10. |
Reset output valid to ground circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
12 |
Figure 11. |
Interfacing to microprocessors with bidirectional reset I/O . . . . . . . . . . . . . . . . . . . . . . . . . |
13 |
Figure 12. |
Supply current vs. temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
Figure 13. |
VPFI threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
Figure 14. |
Reset comparator propagation delay vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
15 |
Figure 15. |
Power-up trec vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
15 |
Figure 16. |
Normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
16 |
Figure 17. |
Watchdog time-out period vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
16 |
Figure 18. |
PFI to PFO propagation delay vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
17 |
Figure 19. |
Output voltage vs. load current (VCC = 5 V; TA = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . |
17 |
Figure 20. |
RST output voltage vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
18 |
Figure 21. |
RST output voltage vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
18 |
Figure 22. |
RST response time (assertion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
19 |
Figure 23. |
RST response time (assertion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
20 |
Figure 24. |
Power-fail comparator response time (assertion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
20 |
Figure 25. |
Power-fail comparator response time (de-assertion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
21 |
Figure 26. |
Maximum transient duration vs. reset threshold overdrive . . . . . . . . . . . . . . . . . . . . . . . . . |
21 |
Figure 27. |
AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
23 |
Figure 28. |
Power-fail comparator waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
23 |
Figure 29. |
MR timing waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
24 |
Figure 30. |
Watchdog timing (STM705/706/813L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
24 |
Figure 31. |
SO8 – 8-lead plastic small outline, 150 mils body width, outline . . . . . . . . . . . . . . . . . . . . |
28 |
Figure 32. |
TSSOP8 – 8-lead, thin shrink small outline, 3 x 3 mm body size, outline . . . . . . . . . . . . . |
29 |
4/33 |
Doc ID 10520 Rev 9 |
STM705, STM706, STM707, STM708, STM813L |
Description |
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The STM705/706/707/708/813L supervisors are self-contained devices which provide microprocessor supervisory functions. A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance condition. When an invalid VCC condition
occurs, the reset output (RST) is forced low (or high in the case of RST).
These devices also offer a watchdog timer (except for STM707/708) as well as a power-fail comparator 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.
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VCC |
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WDO |
WDI |
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RST(1) |
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STM705/706; |
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MR |
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STM813L |
RST(2) |
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PFI |
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PFO |
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VSS |
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AI08825
1.For STM705/706 only.
2.For STM813L only.
VCC
RST
MR
STM707/708 RST
PFI
PFO
VSS
AI08826
Doc ID 10520 Rev 9 |
5/33 |
Description |
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STM705, STM706, STM707, STM708, STM813L |
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Table 2. |
Signal names |
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MR |
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Push-button reset input |
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WDI |
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Watchdog input |
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Watchdog output |
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WDO |
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Active-low reset output |
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RST |
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RST(1) |
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Active-high reset output |
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VCC |
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Supply voltage |
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PFI |
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Power-fail input |
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Power-fail output |
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PFO |
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VSS |
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Ground |
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NC |
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No connect |
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1. For STM813L only.
SO8
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MR |
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WDO |
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VCC |
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7 |
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RST |
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VSS |
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6 |
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WDI |
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PFI |
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PFO |
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AI08827a
1. For STM813L, reset output is active-high.
TSSOP8
(RST) |
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1 |
8 |
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WDI |
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RST |
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WDO |
2 |
7 |
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PFO |
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PFI |
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MR |
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6 |
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VCC |
4 |
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VSS |
AI09114
1. For STM813L, reset output is active-high.
6/33 |
Doc ID 10520 Rev 9 |
STM705, STM706, STM707, STM708, STM813L |
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Description |
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Figure 5. STM707/708 SO8 connections |
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SO8 |
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RST |
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MR |
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RST |
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VSS |
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NC |
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PFI |
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PFO |
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AI08828a |
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TSSOP8
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RST |
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7 |
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PFO |
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MR |
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6 |
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PFI |
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VCC |
4 |
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VSS |
AI09115
Doc ID 10520 Rev 9 |
7/33 |
Pin descriptions |
STM705, STM706, STM707, STM708, STM813L |
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2.1MR
A logic low on MR asserts the reset output. Reset remains asserted as long as MR is low
and for trec after MR returns high. This active-low input has an internal pull-up. It can be driven from a TTL or CMOS logic line, or shorted to ground with a switch. Leave open if
unused.
2.2WDI
If WDI remains high or low for 1.6 s, the internal watchdog timer runs out and reset
(or WDO) is triggered. The internal watchdog timer clears while reset is asserted or when WDI sees a rising or falling edge.
The watchdog function can be disabled by allowing the WDI pin to float.
2.3WDO
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It goes low when a transition does not occur on WDI within 1.6 s, and remains low until |
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a transition occurs on WDI (indicating the watchdog interrupt has been serviced). |
WDO |
also |
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goes low when VCC falls below the reset threshold; however, unlike the reset output, |
WDO |
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goes high as soon as VCC exceeds the reset threshold. Output type is push-pull. |
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Note: |
For those devices with a |
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output, a watchdog timeout will not trigger reset unless |
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WDO |
WDO |
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is connected to |
MR. |
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2.4 RST
Pulses low when triggered, and stays low whenever VCC is below the reset threshold or when MR is a logic low. It remains low for trec after either VCC rises above the reset threshold, or MR goes from low to high.
2.5 |
RST |
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Goes high with triggered, and stays high whenever VCC is above the reset threshold or |
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when |
MR |
is a logic high. It stays high for trec after either VCC falls below the reset threshold, |
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or |
MR |
goes from high to low. |
2.6 PFI
When PFI is less than VPFI, PFO goes low; otherwise, PFO remains high. Connect to ground if unused.
8/33 |
Doc ID 10520 Rev 9 |
STM705, STM706, STM707, STM708, STM813L |
Pin descriptions |
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2.7PFO
When PFI is less than VPFI, PFO goes low; otherwise, PFO remains high. Leave open if unused. Output type is push-pull.
Table 3. |
Pin description |
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Name |
Function |
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STM813L |
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STM707 |
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STM705 |
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STM708 |
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STM706 |
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1 |
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1 |
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1 |
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Push-button reset input |
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MR |
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6 |
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— |
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6 |
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WDI |
Watchdog input |
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8 |
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— |
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8 |
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Watchdog output (push-pull) |
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WDO |
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— |
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7 |
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7 |
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Active-low reset output |
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RST |
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7 |
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8 |
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— |
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RST |
Active-high reset output |
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2 |
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2 |
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2 |
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VCC |
Supply voltage |
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4 |
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4 |
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4 |
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PFI |
Power-fail input |
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5 |
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5 |
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5 |
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Power-fail output (push-pull) |
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PFO |
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3 |
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3 |
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3 |
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VSS |
Ground |
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— |
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6 |
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— |
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NC |
No connect |
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WDI |
WATCHDOG |
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WDI |
transitional |
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WDO |
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TIMER |
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detector |
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VCC |
VRST |
COMPARE |
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VCC |
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MR |
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trec |
RST (RST) |
(1) |
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generator |
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PFI |
VPFI |
COMPARE |
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PFO |
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AI08829 |
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1. For STM813L only.
Doc ID 10520 Rev 9 |
9/33 |
Pin descriptions |
STM705, STM706, STM707, STM708, STM813L |
|
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Figure 8. Block diagram (STM707/708) |
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VCC |
COMPARE |
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VRST |
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RST |
VCC |
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MR |
trec |
RST |
generator |
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PFI |
COMPARE |
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VPFI |
PFO |
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AI08830 |
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5 V |
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Unregulated |
Regulator |
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VIN VCC |
VCC |
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voltage |
STM705
STM706
0.1 mF STM707 STM708
STM813L
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WDI(1) |
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(1) |
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WDO |
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To microprocessor IRQ |
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R1 |
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From microprocessor |
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R2 |
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PFI |
PFO |
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To microprocessor NMI |
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RST |
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To microprocessor reset |
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MR |
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Push-button |
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AI08831a
1. For STM705/706/813L.
10/33 |
Doc ID 10520 Rev 9 |