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_) furnishes typically 19mA from the appropriate polarity supply to the load. This ensures unambiguous rail-to-rail outputs when a fault begins and ends. The MAX4506CSA contains three independent protectors while the MAX4507 contains eight independent protectors. 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 protectors are designed to be always-on when the supplies are on. On-resistance is 100Ω max and matched within 7Ω , and on-leakage is less than 0.5nA at TA = +25°C. The MAX4506CSA is available in 8-pin SO/DIP packages. The MAX4507 is available in 20-pin SSOP and 18-pin SO/DIP packages.
Feature
- Overvoltage Protection
- ±40V with Power Off
- ±36V with Power On
- Open Signal Paths with Power Off
- Output Clamps to Either Rail with an Input Overvoltage
- Any On Channel Output is Not Affected by an Overvoltage to Any Other Channel
- 100Ω max On-Resistance
- 10ns Overvoltage Turn-On Delay
- No Latchup During Power Sequencing
- Rail-to-Rail Signal Handling
- 500Ω Output Clamp Resistance During Overvoltage
Applications
- Automated Test Equipment (ATE)
- Data Acquisition Systems
- Hot-Insertion Boards/Systems
- Process Control Systems
- Redundant/Backup Systems
- Sensitive Instruments
