MAX4508

±40V Fault Protection with Power Off ±25V Fault Protection with ±15V Supplies
Rail-to-Rail Signal Handling
No Power-Supply Sequencing Required
All Channels Off with Power Off
Output Clamped to Appropriate Supply Voltage During Fault Condition
1k½ Output Clamp Resistance During Overvoltage
400Wmax On-Resistance
20ns Fault-Response Time
±4.5V to ±20V Dual Supplies +9V to +36V Single Supply
TTL/CMOS-Compatible Logic Inputs

Data-Acquisition Systems Industrial and Process Control Avionics Signal Routing Redundant/Backup Systems

(Voltages Referenced to GND)
V+............................................................................................-0.3V to +44.0V
V- ............................................................................................-44.0V to +0.3V
V+ to V-....................................................................................-0.3V to +44.0V
COM_, A_ (Note 1) ................................................... (V+ + 0.3V) to (V- - 0.3V)
NO_..............................................................................(V+ - 40V) to (V- + 40V)
NO_ to COM_ ...............................................................................-36V to +36V
NO_ Overvoltage with Switch Power On. .....................................-30V to +30V
NO_ Overvoltage with Switch Power Off. .....................................-40V to +40V
Continuous Current into Any Terminal...................................................±30mA
Peak Current, Into Any Terminal
(pulsed at 1ms, 10% duty cycle)..........................................................±100mA
Continuous Power Dissipation (TA = +70°C)
16 SSOP (derate 8.70mW/°C above +70°C) ......................................667mW
16 Narrow SO (derate 8.70mW/°C above +70°C) ..............................471mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C) 842mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C)............................800mW
Operating Temperature Ranges
MAX4508C_ E/MAX4509C_E.......................................................0°C to +70°C
MAX4508E_ E/MAX4509E_E ....................................................-40°C to +85°C
MAX4508MJE/MAX4509MJE.....................................................-55°C to +125°C
Storage Temperature Range .................................................-65°C to +160°C
Lead Temperature (soldering, 10sec) ...................................................+300°C

Note 1: COM_, EN, and A_ pins are not fault protected. Signals on COM_, EN, or A_ exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to maximum current rating.

The MAX4508/MAX4509 are 8-to-1 and dual 4-to-1 faultprotected multiplexers that are pin-compatible with the industry-standard DG508/DG509. The MAX4508/ MAX4509 operate with dual supplies of ±4.5V to ±20V or a single supply of +9V to +36V. These multiplexers feature fault-protected inputs, Rail-to-Rail® signal handling capability, and overvoltage clamping at 150mV beyond the rails.

Both parts of MAX4508 offer ±40V overvoltage protection with supplies off and ±25V protection with supplies on. Onresistance is 400½ max and is matched between channels to 15Wmax. All digital inputs have TTL logic thresholds, ensuring both TTL and CMOS logic compatibility when using a single +12V supply or dual ±15V supplies.