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Product details

Parameters

Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) 2.63, 2.93, 3.08, 4.38, 4.63 Features Ease-of-use Reset threshold accuracy (%) 5 Output driver type/reset output Active-low, Push-pull Time delay (ms) 240 Rating Catalog Watchdog timer WDI (sec) None Operating temperature range (C) -40 to 105 open-in-new Find other Supervisor & reset ICs

Package | Pins | Size

SOT-23 (DBZ) 3 7 mm² 2.92 x 2.37 open-in-new Find other Supervisor & reset ICs

Features

  • Precision Monitoring of Supply Voltages
    • Available Threshold Options:
      2.63 V, 2.93 V, 3.08 V, 4.38 V, 4.63 V
  • 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
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Description

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.

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Technical documentation

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Type Title Date
* Datasheet LM809/LM810 3-Pin Microprocessor Reset Circuits datasheet (Rev. E) Apr. 20, 2016
Application notes Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) Mar. 17, 2020
Selection guides Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) Feb. 28, 2020
Technical articles Using low-Iq voltage supervisors to extend battery life in handheld electronics Sep. 27, 2019
White papers Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles Selecting voltage detectors, supervisors, and reset ICs for system safety: part 1 Oct. 17, 2016
Technical articles Automotive electronics design made easy Jul. 18, 2013
Technical articles John discusses benefits of LEDs in automobiles Jul. 16, 2013
User guides TLV8xxxEVM-019 Evaluation Modules User's Guide Apr. 08, 2011

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SOT-23 (DBZ) 3 View options

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