The MAX705-MAX708/MAX813L are microprocessor (µP) supervisory circuits that reduce the complexity and number of components required to monitor power-supply and battery functions in µP systems. These devices significantly improve system reliability and accuracy com- pared to separate ICs or discrete components. The MAX705/MAX706/MAX813L provide four functions: 1) A reset output during power-up, power-down, and brownout conditions. 2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds. 3) A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power sup- ply other than +5V. 4) An active-low manual-reset input. The MAX707/MAX708 are the same as the MAX705/ MAX706, except an active-high reset is substituted for the watchdog timer. Th
The MAX705‑MAX708 and MAX813L supervisory circuits reduce component count for monitoring power‑supply and battery functions in microprocessor systems. They offer reset output, watchdog timer, voltage‑monitor threshold, and manual‑reset input to improve system reliability.
The document details electrical characteristics, pin descriptions, typical operating circuits, and package information for the 8‑pin DIP, SO and UMAX packages, along with application notes for power‑fail detection and negative‑voltage monitoring.
| Supply Voltage Range | -0.3 V to 6.0 V |
|---|---|
| Reset Threshold (MAX705/707/813L) | 4.65 V |
| Watchdog Timeout | 1.6 seconds |
| Reset Pulse Width | 200 ms |
| Available Packages | 8‑pin DIP, SO, UMAX |
The reset pulse width is 200 ms.
The watchdog timer times out after 1.6 seconds if the watchdog input is not toggled.
A reset is generated when the supply voltage drops below 4.65 V.
They are offered in 8‑pin DIP, SO, and UMAX packages.