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.
The MAX4533 operates from dual ±4.5V to ±18V power supplies or a single +9V to +36V supply. All digital inputs have +0.8V and +2.4V logic thresholds, ensuring both TTL and CMOS logic compatibility when using ±15V supplies or a +12V supply. On-resistance is 175Ω max and is matched between switches to 10Ω max. The off-leakage current is only 0.5nA at TA = +25°C and 10nA at TA = +85°C.
Key Features
Applications/Uses
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
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