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Product details

Parameters

Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) 4.63 Features Ease-of-use Reset threshold accuracy (%) 5 Output driver type/reset output Active-high, 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
Selection guides Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) Feb. 28, 2020
White papers Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application notes Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) Oct. 09, 2018
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 Don’t underestimate the power of an LDO Oct. 19, 2013
Technical articles How to optimize your DSP power budget Oct. 03, 2013
Technical articles "X" Marks the spot - 7 Treasures in a pirate engineer's treasure chest Sep. 19, 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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