List of figures STM1001
4/18 Doc ID 10373 Rev 6
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 5. Supply current vs. temperature, L/M/R/S/T (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Power-down reset delay vs. temperature - V
OD
= V
TH
– V
CC
(L/M) . . . . . . . . . . . . . . . . . . . 8
Figure 7. Power-down reset delay vs. temperature - V
OD
= V
TH
– V
CC
(R/S/T) . . . . . . . . . . . . . . . . . 9
Figure 8. Power-up t
rec
vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 9. Normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 10. Max transient duration not causing reset pulse vs. reset comparator overdrive. . . . . . . . . 10
Figure 11. AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 12. SOT23-3 – 3-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . . 14
STM1001 Description
Doc ID 10373 Rev 6 5/18
1 Description
The STM1001 microprocessor reset circuit is a low-power supervisory device used to
monitor power supplies. It performs a single function: asserting a reset signal whenever 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
).
Figure 1. Logic diagram
Table 1. Signal names
Figure 2. Connections
V
SS
Ground
RST Active-low reset output (open drain)
V
CC
Supply voltage
AI09116
V
CC
STM1001
V
SS
RST
AI09117
2
3
1
RST
V
CC
V
SS
SOT23-3
Description STM1001
6/18 Doc ID 10373 Rev 6
Figure 3. Block diagram
1. Open drain
Figure 4. Hardware hookup
1. RST output requires pull-up resistor.
AI09118
COMPARE
V
RST
V
CC
t
rec
Generator
RST
(1)
AI09119
V
CC
V
SS
V
CC
MCU
STM1001
RST
(1)
V
CC
V
SS
RESET
Input
(1)

STM1001RWX6F

Mfr. #:
Manufacturer:
STMicroelectronics
Description:
Supervisory Circuits RESET CIRCUIT
Lifecycle:
New from this manufacturer.
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