LM809
- Precision Monitoring of Supply Voltages
- Available Threshold Options:
2.63 V, 2.93 V, 3.08 V, 4.38 V, 4.63 V
- Available Threshold Options:
- Superior Upgrade to MAX809 and MAX810
- Fully Specified Over Temperature
- 140-ms Minimum Power-On Reset Pulse Width,
240-ms Typical- Active-Low RESET Output (LM809)
- Active-High RESET Output (LM810)
- Ensured RESET Output Valid for VCC ≥ 1 V
- Low Supply Current, 15-µA Typical
- Power Supply Transient Immunity
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.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM809/LM810 3-Pin Microprocessor Reset Circuits datasheet (Rev. E) | PDF | HTML | 2016年 4月 20日 |
| Application note | Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) | 2020年 3月 17日 | ||
| Selection guide | Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) | 2020年 2月 28日 | ||
| Technical article | Using low-Iq voltage supervisors to extend battery life in handheld electronics | PDF | HTML | 2019年 9月 27日 | |
| E-book | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | 2019年 6月 28日 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 | ||
| Technical article | Selecting voltage detectors, supervisors, and reset ICs for system safety: part 1 | PDF | HTML | 2016年 10月 17日 | |
| EVM User's guide | TLV8xxxEVM-019 Evaluation Modules User's Guide | 2011年 4月 8日 |
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