STM632x, STM682x
5-pin supervisor with watchdog timer and push-button reset
Datasheet
-
production data
Features
•
Precision V
CC
monitoring of 5, 3.3, 3, or 2.5 V
power supplies
•
RST outputs (active low, push-pull or open
drain)
•
RST outputs (active high, push-pull)
•
Reset pulse width of 1.4 ms, 200 ms and
240 ms (typ.)
•
Watchdog timeout period of 1.6 s (typ.)
•
Manual reset input (MR)
SOT23-5 (WY)
•
Low supply current - 3 µA (typ.)
•
Guaranteed RST (RST) assertion down to
V
CC
= 1.0 V
•
Operating temperature: –40 to +85 °C
(industrial grade)
•
RoHS compliance
Lead-free components are compliant with the
RoHS directive
Table 1. Device summary
Reset output
Part number
Watchdog
input
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
Manual
reset input
Active low
(push-pull)
Active high
(push-pull)
✔
✔
✔
✔
Active low
(open drain)
✔
✔
STM632x
STM6321
STM6322
STM6821
STM6822
STM682x
STM6823
STM6824
STM6825
June 2016
This is information on a product in full production.
DocID11110 Rev 13
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Contents
STM632x, STM682x
Contents
1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5
Active low, push-pull reset output (RST) - 6823/6824/6825 . . . . . . . . . . 7
Active low, open drain reset output (RST) - STM6321/6322/6822 . . . . . 7
Push-button reset input (MR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Watchdog input (WDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Active high reset output (RST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1
2.2
2.3
2.4
2.5
Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Open drain RST output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Push-button reset input (STM6322/6821/6822/6823/6825) . . . . . . . . . . . .11
Watchdog input (STM6321/6821/6822/6823/6824) . . . . . . . . . . . . . . . . . .11
Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.5.1
2.5.2
Watchdog input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Ensuring a valid reset output down to V
CC
= 0 V . . . . . . . . . . . . . . . . . . 11
2.6
Interfacing to microprocessors with bidirectional reset pins . . . . . . . . . . . 12
3
4
5
6
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.1
SOT23-5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7
8
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
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STM632x, STM682x
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SOT23-5 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SOT23-5 carrier tape dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
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3
List of figures
STM632x, STM682x
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Logic diagram (STM6821/6822/6823) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Logic diagram (STM6321/6322/6824/6825) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
STM6822/6823 SOT23-5 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STM6821 SOT23-5 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STM6322/6825 SOT23-5 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STM6321/6824 SOT23-5 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Block diagram (STM6821/6822/6823) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Block diagram (STM6321/6824) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Block diagram (STM6322/6825) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
STM6321/6322/6822 open drain RST output with multiple supplies . . . . . . . . . . . . . . . . . 10
Ensuring RST valid to V
CC
= 0, (active low push-pull outputs). . . . . . . . . . . . . . . . . . . . . . 12
Ensuring RST valid to V
CC
= 0, (active high, push-pull outputs) . . . . . . . . . . . . . . . . . . . . 12
Interfacing to microprocessors with bidirectional reset I/O . . . . . . . . . . . . . . . . . . . . . . . . . 12
V
CC
-to-reset output delay vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Supply current vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
MR-to-reset output delay vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Normalized power-up t
rec
vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Normalized reset threshold voltage vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Normalized power-up watchdog timeout period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Voltage output low vs. I
SINK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Voltage output high vs. I
SOURCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Maximum transient duration vs. reset threshold overdrive . . . . . . . . . . . . . . . . . . . . . . . . . 17
AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
MR timing waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Watchdog timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SOT23-5 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SOT23-5 carrier tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
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DocID11110 Rev 13
STM632x, STM682x
Description
1
Description
The STM6xxx supervisors are self-contained devices which provide microprocessor
supervisory functions. A precision voltage reference and comparator monitors the V
CC
input
for an out-of-tolerance condition. When an invalid V
CC
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 STM6322/6825) and/or a push-button (MR) reset input.
These devices are available in a standard 5-pin SOT23 package.
Figure 1. Logic diagram (STM6821/6822/6823)
V
CC
WDI
STM6XXX
MR
RST (RST)
(1)
V
SS
AI09128
1. For STM6821 only.
Figure 2. Logic diagram (STM6321/6322/6824/6825)
V
CC
RST
(WDI)
(1)
MR
STM6XXX
RST
V
SS
AI09129
1. For STM6321/6824.
Table 2. Signal names
Name
MR
WDI
RST
RST
V
CC
V
SS
Push-button reset input
Watchdog input
Active low reset output
Active high reset output
Supply voltage
Ground
Function
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