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Supervisor & reset ICs

LM809

ACTIVE

3-pin voltage supervisor (reset IC) with active-low, push-pull reset for supply monitoring

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Data sheet

LM809

ACTIVE
Data sheet Order now

Product details

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 Iq (typ) (mA) 0.015 Output driver type/reset output Active-low, Push-Pull Time delay (ms) 240 Supply voltage (min) (V) 1 Supply voltage (max) (V) 5.5 Rating Catalog Watchdog timer WDI (s) None Operating temperature range (°C) -40 to 105
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 Iq (typ) (mA) 0.015 Output driver type/reset output Active-low, Push-Pull Time delay (ms) 240 Supply voltage (min) (V) 1 Supply voltage (max) (V) 5.5 Rating Catalog Watchdog timer WDI (s) None Operating temperature range (°C) -40 to 105
SOT-23 (DBZ) 3 6.9204 mm² 2.92 x 2.37
  • 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
  • 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

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.

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
* Data sheet LM809/LM810 3-Pin Microprocessor Reset Circuits datasheet (Rev. E) PDF | HTML 20 Apr 2016
Application note Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) 17 Mar 2020
Selection guide Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) 28 Feb 2020
Technical article Using low-Iq voltage supervisors to extend battery life in handheld electronics PDF | HTML 27 Sep 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Selecting voltage detectors, supervisors, and reset ICs for system safety: part 1 PDF | HTML 17 Oct 2016
EVM User's guide TLV8xxxEVM-019 Evaluation Modules User's Guide 08 Apr 2011

Design & development

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LM809_2P45 PSpice Transient Model

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LM809_2P45 Unencrypted PSpice Transient Model

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LM809_2P63 PSpice Transient Model

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LM809_2P63 Unencrypted PSpice Transient Model

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Simulation model

LM809_2P93 PSpice Transient Model

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LM809_2P93 Unencrypted PSpice Transient Model

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Simulation model

LM809_3P08 PSpice Transient Model

SNVMA35.ZIP (41 KB) - PSpice Model
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LM809_3P08 Unencrypted PSpice Transient Model

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Simulation model

LM809_4P0 PSpice Transient Model

SNVMA44.ZIP (41 KB) - PSpice Model
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LM809_4P0 Unencrypted PSpice Transient Model

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Simulation model

LM809_4P38 PSpice Transient Model

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LM809_4P38 Unencrypted PSpice Transient Model

SNVMA37.ZIP (2 KB) - PSpice Model
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Simulation model

LM809_4P63 PSpice Transient Model

SNVMA33.ZIP (41 KB) - PSpice Model
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LM809_4P63 Unencrypted PSpice Transient Model

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