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MAX4509：Fault-Protected, High-Voltage Single 8-to-1/Dual 4-to-1 Multiplexers with Output Clamps

The MAX4508/MAX4509 are 8-to-1 and dual 4-to-1 fault-protected 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 offer ±40V overvoltage protection with supplies off and ±25V protection with supplies on. On-resistance is 400Ω max and is matched between channels to 15Ω max. All digital inputs have TTL logic thresholds, ensuring both TTL and CMOS logic compatibility when using a single +12V supply or dual ±15V supplies.

Key Features ±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 1kΩ Output Clamp Resistance During Overvoltage 400Ω max On-Resistance 20ns Fault-Response Time ±4.5V to ±20V Dual Supplies +9V to +36V Single Supply TTL/CMOS-Compatible Logic Inputs

MAX4508, MAX4509: Functional Diagram Applications/Uses Avionics Data Acquisition Systems Industrial and Process Control Redundant/Backup Systems Signal Routing

DataSheet

Parametrics

Quality and Environmental Data

• MAX4509.pdf

Ordering Information