The LM809 and LM810 microprocessors supervisory circuits can be used to monitor the power supplies in microprocessor and digital systems. They provide a reset to the microprocessor during power-up, power-down and brown-out conditions.
The function of the LM809 and LM810 are to monitor the VCC supply voltage, and assert a reset signal whenever this voltage declines below the factory-programmed reset threshold. The reset signal remains asserted for 240 ms after VCC rises above the threshold. The LM809 has an active-low RESET output, while the LM810 has an active-high RESET output.
Seven standard reset voltage options are available, suitable for monitoring 5-V, 3.3-V, and 3-V supply voltages.
With a low supply current of only 15 µA, the LM809 and LM810 are ideal for use in portable equipment.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LM809/LM810 3-Pin Microprocessor Reset Circuits datasheet (Rev. E) | PDF | HTML | Apr 20, 2016 |
| Application note | Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) | Mar 17, 2020 | ||
| Selection guide | Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) | Feb 28, 2020 | ||
| Technical article | Using low-Iq voltage supervisors to extend battery life in handheld electronics | PDF | HTML | Sep 27, 2019 | |
| E-book | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | Jun 28, 2019 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | Jun 25, 2018 | ||
| Technical article | Selecting voltage detectors, supervisors, and reset ICs for system safety: part 1 | PDF | HTML | Oct 17, 2016 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBZ) | 3 | Ultra Librarian |
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