MAX378/MAX379 8/4 channel single-ended/differential switch with fault protection
The MAX378 (8‑channel single‑ended) and MAX379 (4‑channel differential) are fault‑protected analog multiplexers that use a series N‑channel/P‑channel/N‑channel structure. This design limits fault currents to nanoamp levels and protects both the device and connected sensors when power supplies are removed.
Key features include TTL/CMOS compatible digital inputs (0.8 V low, 2.4 V high), break‑before‑make operation, low power dissipation (<2 mW), and operation over a wide supply range (+4.5 V to +18 V). The devices are suitable for data‑acquisition systems, industrial control, and avionics test equipment.
| Supply Voltage Range | +4.5 V to +18 V |
|---|---|
| Continuous Input Voltage (Fault Protected) | +60 V |
| Maximum Input Voltage (with margin) | +75 V |
| Power Dissipation | <2 mW |
| Input Leakage Current (OFF) | <1 nA |
| Digital Input Thresholds | Low 0.8 V, High 2.4 V |
They operate from +4.5 V up to +18 V.
Low threshold is 0.8 V and high threshold is 2.4 V.
Power dissipation is less than 2 mW.