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Parameters

Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) 2.32, 3.08, 4.63 Features Active-low enable, Manual reset, Ease-of-use Reset threshold accuracy (%) 2.5 Output driver type/reset output Active-low, Open-drain Time delay (ms) 190 Rating Catalog Watchdog timer WDI (sec) None Operating temperature range (C) -40 to 125, -40 to 85 open-in-new Find other Supervisor & reset ICs

Package | Pins | Size

SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 open-in-new Find other Supervisor & reset ICs

Features

  • Precise Monitoring of 2.5V, 3.3V, and 5V Supply Voltages
  • Fully Specified Over Temperature
    • Industrial: −40°C to +85°C
    • Extended: −40°C to +125°C
  • 100 ms Minimum Power-On Reset pulse Width, 190 ms Typical:
    • Active-Low RESET Output (LM3722)
    • Active-High RESET Output (LM3723)
    • Active-Low RESET Open Drain Output (LM3724)
  • Guaranteed RESET Output Valid for VCC ≥ 1V
  • Low Supply Current, 6µA Typical
  • Power Supply Transient Immunity
  • Compatible with MAX811/812 Applications

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Description

The LM3722/LM3723/LM3724 microprocessor supervisory circuits monitor the power supplies in microprocessor and digital systems. They provide a reset to the microprocessor during power-up, power-down, brown-out conditions, and manual reset.

The LM3722/LM3723/LM3724 asserts a reset signal whenever the supply decreases below the factory-programmed reset threshold. Reset will be asserted for at least 100ms even after VCC rises above the reset threshold.

The LM3722 has an active-low RESET push-pull output. The LM3723 has an active-high RESET push-pull output. The LM3724 has an active-low open-drain RESET output.

Three standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 2.5V supply voltages. Additional reset voltages are also available; contact Texas Instruments for details.

With a low supply current of only 6µA, the LM3722/LM3723/LM3724 are ideal for use in portable equipment. The LM3722/LM3723/LM3724 are available in the 5-pin SOT-23 package.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
TPS3840 ACTIVE Nanopower high-input voltage supervisor with manual reset and programmable-reset time delay TPS3840 offers more threshold voltage options (1.6 V to 4.9 V) with low 0.3-uA quiescent current and programmable time delay

Technical documentation

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Type Title Date
* Datasheet LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits datasheet (Rev. E) Mar. 21, 2013
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

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SOT-23 (DBV) 5 View options

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