The MAX6381–MAX6390 microprocessor (µP) supervisory circuits monitor power supply voltages from +1.8V to +5.0V while consuming only 3µA of supply current at +1.8V. Whenever VCC falls below the factory-set reset thresholds, the reset output asserts and remains assert- ed for a minimum reset timeout period after VCC rises above the reset threshold. Reset thresholds are available from +1.58V to +4.63V, in approximately 100mV incre- ments. Seven minimum reset timeout delays ranging from 1ms to 1200ms are available. The MAX6381/MAX6384/MAX6387 have a push-pull active-low reset output. The MAX6382/MAX6385/ MAX6388 have a push-pull active-high reset output, and the MAX6383/MAX6386/MAX6389/MAX6390 have an open-drain active-low reset output. The MAX6384/MAX6385/MAX6386 also feature a debounced manual reset input (with internal pullup resistor). The MAX6387/MAX6388/MAX6389 have an auxiliary input for monitoring a second voltage. The MAX6390 offers a manual reset input with a longer VCC reset timeout period (1120ms or 1200ms) and a shorter manual reset timeout (140ms or 150ms). The MAX6381/MAX6382/MAX6383 are available in 3-pin SC70 packages and the MAX6384–MAX6390 are avail- able in 4-pin SC70 packages.
The MAX6381‑MAX6390 C70 family monitors supply voltages from +1.8 V to +5.0 V while drawing only a few microamps of current. Factory‑set reset thresholds range from +1.58 V to +4.63 V, and seven reset timeout periods are available, from a few milliseconds up to 1.2 s. Different devices in the family offer push‑pull active‑low, active‑high, or open‑drain reset outputs, with some parts adding manual‑reset inputs or auxiliary voltage monitoring.
These supervisory circuits are intended for computers, controllers, intelligent instruments, portable/battery‑powered equipment, and dual‑voltage systems. They are supplied in compact 3‑pin or 4‑pin SC70 packages, making them suitable for space‑constrained designs.
| Operating Voltage Range | 1.0 V to 5.5 V |
|---|---|
| Supply Current at 1.8 V | 3 µA |
| Reset Threshold Range | +1.58 V to +4.63 V |
| Number of Reset Timeout Periods | 7 |
| Reset Output Options | Active‑Low Push‑Pull, Active‑High Push‑Pull, Active‑Low Open‑Drain |
| Package Types | 3‑pin SC70 (MAX6381‑MAX6383) and 4‑pin SC70 (MAX6384‑MAX6390) |
The device consumes about 3 µA of supply current at +1.8 V.
Seven reset timeout periods are available, ranging from a few milliseconds up to 1.2 seconds.
The family provides active‑low push‑pull, active‑high push‑pull, and active‑low open‑drain reset outputs.
MAX6381‑MAX6383 come in 3‑pin SC70 packages, while MAX6384‑MAX6390 are offered in 4‑pin SC70 packages.