stm1818r STMicroelectronics, stm1818r Datasheet - Page 10

• Manufacturer Part Number: stm1818r
• Description: Low Power Reset Circuit
• Manufacturer: STMicroelectronics

Operation
2.5
Note:
10/25
threshold and lasts 20 µs or less will not cause a reset pulse. A 0.1 µF bypass capacitor
mounted as close as possible to the V
Valid RST output down to V
When V
circuit. In most systems this is not a problem, as most MCUs do not operate below 1 V.
However, in applications where RST output must be valid down to 0 V, a pull-down resistor
may be added to hold the RST output low (see
enough to not load the RST output, and still be small enough to pull the output to ground. A
100 k
The same situation applies for the active-high RST of the STM1810/1812. A 100 k
resistor to V
Figure 8.
1. RST for STM1812 and STM1817.
Figure 9.
RST
RST
V CC
CC
(1)
resistor is recommended.
falls below 1 V, the RST output no longer sinks current, but becomes an open
V CC (min)
CC
Reset timing diagram
Push-button manual reset with MR detect (STM1813/1818)
should be used if RST must remain valid for V
V
CC
STM1813
STM1818
V RST
Monitor
Reset
V
SS
t rec
t rec
V
CC
CC
pin provides additional transient immunity.
CC
STM1810/1811/1812/1813/1815/1816/1817/1818
5.5 k
RST
= 0 V
Figure
12). This resistor must be large
Push-button RESET
CC
Micro RESET
< 1.0 V.
AI09654
AI09653
pull-up