| Number of supplies monitored | 1 |
| Threshold voltage 1 (Typ) (V) | 2.32, 3.08, 4.63 |
| Features | Manual reset capable, 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 |
- 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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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.
