Maxim Integrated MAX6389XS44D3+T, Multi-Voltage Supervisor, 2-Channel, Active Low, Open Drain, Reset Timeout 140ms, Threshold 4.38V, SC-70-4, -40°C to 125°C, Surface Mount.
| Parameter | Value |
|---|---|
| Type | Multi-Voltage Supervisor |
| Mounting type | Surface Mount |
| Voltage - threshold | 4.38V, Adj |
| Number of voltages monitored | 2 |
| Operating temperature | -40°C ~ 125°C (TA) |
| Reset | Active Low |
| Output | Open Drain or Open Collector |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Reset timeout | 140ms Minimum |
| Case | SC-82A, SOT-343 |
Housed in a SC-70-4 package, it operates from -40°C to 125°C.
It is a current-production Maxim Integrated (now part of Analog Devices) supervisor that you can specify into new designs without worrying about a sudden EOL.
The MAX6388 and MAX6389 are different variants within the same family — the MAX6389 monitors two voltages, while the MAX6388 monitors a single voltage. They share the same SC-70-4 footprint and pinout, but the MAX6389 adds the adjustable second channel. If your design needs two rails monitored, the MAX6389 is a functional superset; if you only need one, the MAX6388 is the simpler choice.
The reset output is active low, open drain. That means it pulls to ground when a fault is detected, and you need an external pull-up resistor to the logic supply voltage of the downstream device.