STM1818TWX7F STMicroelectronics, STM1818TWX7F Datasheet - Page 10

• Manufacturer Part Number: STM1818TWX7F
• Description: IC MPU RESET CIRCUIT 3.06V SOT23
• Manufacturer: STMicroelectronics
• Type: Simple Reset/Power-On Resetr

Specifications of STM1818TWX7F

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 100 ms Minimum
• Voltage - Threshold: 3.06V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3
• Monitored Voltage: 3 V or 3.3 V or 5 V
• Undervoltage Threshold: 2.98 V
• Overvoltage Threshold: 3.15 V
• Manual Reset: Resettable
• Watchdog: No
• Battery Backup Switching: No
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.2 V
• Supply Current (typ): 16 uA
• Maximum Power Dissipation: 320 mW
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 105 C
• Chip Enable Signals: No
• Minimum Operating Temperature: - 40 C
• Output Type: Active Low or Open Drain
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-4796-2

Operation
2.5
Note:
Figure 7.
1. RST for STM1812 and STM1817.
Figure 8.
10/25
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 kΩ resistor is recommended.
The same situation applies for the active-high RST of the STM1810/1812. A 100 k
resistor to V
Reset timing diagram
Push-button manual reset with MR detect (STM1813/1818)
CC
falls below 1 V, the RST output no longer sinks current, but becomes an open
CC
should be used if RST must remain valid for V
Doc ID11464 Rev 8
CC
STM1810/1811/1812/1813/1815/1816/1817/1818
= 0 V
Figure
11). This resistor must be large
CC
< 1.0 V.
Ω
pull-up