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 series provides supervisory circuits that monitor supply voltages from +1.8 V to +5.0 V while drawing only a few microamps. When VCC falls below a factory‑set threshold, the reset output asserts and remains asserted for a programmable timeout period after VCC recovers.
The devices are offered in 3‑pin and 4‑pin SC70 packages with seven selectable reset timeout periods (1 ms to 1200 ms) and multiple output options (active‑low push‑pull, active‑high push‑pull, active‑low open‑drain). They are pin‑compatible with a range of Maxim parts and are suited for computers, controllers, intelligent instruments, and battery‑powered equipment.
| Operating Voltage Range (VCC) | 1.0 V – 5.5 V |
|---|---|
| Reset Threshold Range | +1.58 V to +4.63 V |
| Reset Timeout Options | 1 ms, 20 ms, 140 ms, 280 ms, 560 ms, 1120 ms, 1200 ms |
| Package Types | 3‑pin SC70 (MAX6381‑MAX6383) and 4‑pin SC70 (MAX6384‑MAX6390) |
Seven reset timeout periods are available, ranging from 1 ms to 1200 ms.
The series provides active‑low push‑pull, active‑high push‑pull, and active‑low open‑drain reset outputs.