Fault-protected, High-voltage Signal-line Protectors

The MAX4506 MAX4507 multiple, two-terminal signal-line protectors are pin-compatible with the industry-standard MAX366 MAX367. These new circuit protectors feature fault-protected inputs and Rail-to-Rail signal handling capability. The input pins are protected from overvoltage faults up to 36V with power on or 40V with power off. During a fault condition, the input terminal becomes an open circuit and only nanoamperes of leakage current flow from the source; but the Switch output (OUT_) fur- nishes typically 19mA from the appropriate polarity sup- ply to the load. This ensures unambiguous Rail-to-Rail outputs when a fault begins and ends. The MAX4506 contains three independent protectors while the MAX4507 contains eight independent protec- tors. They CAN protect both unipolar and bipolar Analog signals using either unipolar (+9V to +36V) or bipolar (8V to 18V) power supplies. These devices have no Logic control inputs; the protec- tors are designed to be always-on when the supplies are on. On-resistance is 100 max and matched within 7, and on-leakage is less than 0.5nA at TA = +25C. The MAX4506 is available in 8-pin SO/DIP packages. The MAX4507 is available in 20-pin SSOP and 18-pin SO/DIP packages. By Maxim Integrated Products