MAX4712 Datasheet

• Fault-Protected Analog Inputs
• ±12V Fault Protection with Power Off
• ±7V Fault Protection with ±5V Supplies
• +12V and -7V Fault Protection with +5V Supply
• +12V and -9V Fault Protection with +3V Supply
• Fault-Protected Digital Inputs May Exceed V+ Supply Rail
• All Switches Off with Power Off
• Rail-to-Rail Signal Handling
• Output Clamped to Appropriate Supply Voltages During Fault Condition
• 25Ω (max) R_ON at +25°C
• 1Ω (max) On-Resistance Match Between Channels
• Single- and Dual-Supply Operation
• Pin-Compatible with Industry-Standard MAX392
• TTL- and CMOS-Compatible Logic Inputs

• Avionics
• Battery-Operated Systems
• Communication Systems
• Data Acquisition
• Industrial and Process Control Systems
• Redundant/Backup Systems
• Signal Routing
• Test Equipment

The MAX4712 are fault-protected, Rail-to-Rail, low-voltage analog switches featuring low on-resistance and guaranteed on-resistance flatness over the specified signal range. Due to the fault protection feature the analog switch input (NO_ or NC_) and output (COM_) pins are not symmetrical. The fault protection feature allows for the analog input to go beyond the plus or minus supplies without the device drawing excessive amounts of current from the analog inputs. When the analog inputs are driven beyond the supply rails when the switch is on, it will sense a fault and turn itself off and the analog switch output will be clamped to the same polarity supply as the input signal and will not go beyond the supply rails. This feature protects any electronic circuitry connected to the output from excessive voltages present on the analog inputs.

The MAX4712 are quad, singlepole/single-throw (SPST) analog switches. The MAX4712 has four normally open switches (NO). Switching times are less than 125ns for t_ON, and less than 80ns for t_OFF. These switches operate from a single +2.7V to +11V supply or from dual ±2.7V to ±5.5V supplies. All digital inputs have +0.8V to +2.4V logic thresholds, ensuring both TTL and CMOS logic compatibility when using ±4.5V to ±5.5V or single +4.5V to +11V supplies.