The MAX6365-MAX6368 supervisory circuits simplify power-supply monitoring, battery-backup control functions, and memory write protection in microprocessor (µP) systems. The circuits significantly improve the size, accuracy, and reliability of modern systems with an ultra- small integrated solution. These devices perform four basic system functions: 1) Provide a µP reset output during VCC supply power- up, power-down, and brownout conditions. 2) Internally control VCC to backup-battery switching to maintain data or low-power operation for CMOS RAM, CMOS µPs, real-time clocks, and other digital logic when the main supply fails. 3) Provide memory write protection through internal chip-enable gating during supply or processor faults. 4) Include one of the following options: a manual reset input (MAX6365), a watchdog timer function (MAX6366), a battery-on output (MAX6367), or an auxiliary user-adjustable reset input (MAX6368). The MAX6365-MAX6368 operate from VCC supply volt- ages as low as 1.2V. The factory preset reset threshold voltages range from 2.32V to 4.63V (see Ordering Information). In addition, each part is offered in three reset output versions: push-pull active low, open-drain active low, or open-drain active high (see Selector Guide). The MAX6365-MAX6368 are available in minia- ture 8-pin SOT23 packages.
The MAX6365 and MAX6368 are low‑power microprocessor supervisory circuits in an 8‑pin SOT‑23 package. They provide reset output, battery‑backup switching, memory write protection, and optional functions such as manual reset, watchdog timer, battery‑on indicator, or adjustable reset input.
The devices operate from 1.2 V to 5.5 V, offer three reset‑output structures, and include on‑board chip‑enable gating with a 1.5 ns propagation delay. Detailed electrical characteristics, pin descriptions, and typical operating curves are provided.
| Operating Voltage Range | 1.2 V to 5.5 V |
|---|---|
| Reset Timeout Period | ≥150 ms |
| Quiescent Supply Current | ≈10 µA |
| Package | 8‑pin SOT‑23 |
They operate from 1.2 V up to 5.5 V.
The reset timeout period is at least 150 ms.
The devices are housed in an 8‑pin SOT‑23 package.
Typical quiescent supply current is about 10 µA.