The MAX823/MAX824/MAX825* microprocessor (µP) supervisory circuits combine reset output, watchdog, and manual reset input functions in 5-pin SOT23 and SC70 packages. They significantly improve system reliability and accuracy compared to separate ICs or discrete components. The MAX823/MAX824/MAX825 are specifically designed to ignore fast transients on VCC. Seven preprogrammed reset threshold voltages are available (see Reset Threshold Table). All three devices have an active-low reset output, which is guaranteed to be in the correct state for VCC down to 1V. The MAX823 also offers a watchdog input and manual reset input. The MAX824 offers a watchdog input and a complementary active-high reset. The MAX825 offers a manual reset input and a complementary active-high reset.
The MAX823, MAX824 and MAX825 are 5‑pin microprocessor supervisory circuits that combine reset output, watchdog timer and manual reset functions in SOT‑23 and SC70 packages. They provide precise monitoring of common supply voltages and improve system reliability compared to discrete components.
The devices offer seven selectable reset‑threshold voltages, active‑low or active‑high reset outputs, and optional watchdog or manual‑reset inputs. Detailed electrical characteristics, pin descriptions, ordering information and package dimensions are included.
| Operating Current (MAX823L/M, SC70) | 6 µA |
|---|---|
| Number of Reset Threshold Options | 7 |
| Watchdog Timeout Period | 1.6 s |
| Maximum RESET Output Pull‑up Current (L/M versions) | 800 µA |
| Operating Temperature Range | -40 °C to +125 °C |
The watchdog timer timeout period is 1.6 seconds.
Seven pre‑programmed reset‑threshold voltage options are provided.
The MIN operating current for MAX823L/M in SC70 package is 6 µA.
The RESET output can source up to 800 µA for L/M versions (400 µA for T/S/R/Z/Y versions).