General Description
The MAX4533 quad, single-pole/double-throw (SPDT), fault-protected analog switch is pin-compatible with the industry-standard MAX333 and MAX333A. The MAX4533 features fault-protected inputs and Rail-to-Rail® signal handling. The normally open (NO_ ) and normally closed (NC_ ) terminals are protected from overvoltage faults up to ±25V with power on and up to ±40V with power off. During a fault condition, NO_ and NC_ become high impedance with only nanoamperes of leakage current flowing to the source. In addition, the output (COM_) clamps to the appropriate polarity supply rail and provides up to ±10mA of load current. This ensures unambiguous rail-to-rail outputs when a fault occurs.

Features
♦ Rail-to-Rail Signal Handling
♦ ±40V Fault Protection with Power Off ±25V Fault Protection with ±15V Supplies
♦ All Switches Off with Power Off
♦ No Power-Supply Sequencing Required During Power-Up or Power-Down
♦ Output Clamped to Appropriate Supply Voltage During Fault Condition—No Transition Glitch
♦ 1kΩ (typ) Output Clamp Resistance During Overvoltage
♦ 175Ω (max) Signal Paths with ±15V Supplies
♦ 20ns (typ) Fault Response Time
♦ ±4.5V to ±18V Dual Supplies +9V to +36V Single Supply
♦ Pin-Compatible with Industry-Standard MAX333/MAX333A
♦ TTL/CMOS-Compatible Logic Inputs with ±15V or Single +9V to +15V Supplies

Applications
    Redundant/Backup Systems
    Portable Instruments
    Test Equipment
    Data-Acquisition Systems
    Communications Systems
    Industrial and Process Control
    Avionics Systems