The MAX6832-MAX6840 are microprocessor (µP) supervisory circuits used to monitor low-voltage power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +1.2V to +1.8V powered circuits. These devices assert a reset signal whenever the VCC supply voltage declines below a preset threshold or whenever manual reset (MR) is asserted. Reset remains asserted for a fixed timeout delay after VCC has risen above the reset threshold or when manual reset is deasserted. Five different timeout periods are available: 70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s. Reset thresholds suitable for operation with a variety of supply voltages are available. The MAX6832/MAX6835/MAX6838 have a push-pull active-low reset output (RESET). The MAX6833/MAX6836/MAX6839 have a push-pull active-high reset output (RESET) and the MAX6834/MAX6837/MAX6840 have an open-drain active-low reset output (RESET). The open-drain active-low reset output requires a pullup resistor that can be connected to a voltage higher than VCC. The MAX6835/MAX6836/MAX6837 feature a debounced manual reset input (MR), while the MAX6838/MAX6839/MAX6840 provide a RESET-IN input allowing the user to externally adjust the reset threshold. The reset comparator is designed to ignore fast transients on VCC. Low supply current of 7.5µA makes the MAX6832-MAX6840 ideal for use in portable equipment.
The MAX6832‑MAX6840 family are microprocessor supervisory circuits that monitor low‑voltage power supplies in uP and digital systems. They generate a reset when VCC falls below a preset threshold or when a manual reset is asserted, and they hold the reset for a selectable timeout period.
These devices are offered in 3‑ and 4‑pin SC70 packages, consume only 7.5 µA typical supply current, and operate over a temperature range of –40 °C to +85 °C. Five timeout options (70 µs, 1.5 ms, 30 ms, 210 ms, 1.68 s) and three reset‑output configurations (push‑pull active‑low, push‑pull active‑high, open‑drain active‑low) give designers flexibility for a wide range of portable and battery‑powered applications.
| Supply Voltage Range | 1.2 V to 1.8 V |
|---|---|
| Supply Current | 7.5 µA typical |
| Timeout Period Options | 70 µs, 1.5 ms, 30 ms, 210 ms, 1.68 s |
| Reset Output Configurations | Push‑pull active‑low, push‑pull active‑high, open‑drain active‑low |
| Package Types | 3‑pin and 4‑pin SC70 |
| Operating Temperature Range | -40 °C to +85 °C |
| Reset Threshold Voltage | Factory‑set for 1.2 V to 1.8 V supplies |
They operate with circuits powered from 1.2 V to 1.8 V.
Five timeout periods are available: 70 µs, 1.5 ms, 30 ms, 210 ms, and 1.68 s.
The devices provide push‑pull active‑low, push‑pull active‑high, and open‑drain active‑low reset outputs.
Typical supply current is 7.5 µA.