The MAX4708/MAX4709 8-to-1 and dual 4-to-1 fault-protected multiplexers are pin compatible with the industrystandard DG508/DG509. The MAX4708/MAX4709 are similar to the MAX4508/MAX4509, but these devices do not have clamp diodes to the supply rails on the switch outputs. These multiplexers feature fault-protected inputs, Rail-to-Rail signal-handling capability, and do not require power-supply sequencing. Both devices offer 40V overvoltage protection with the supplies off, 36V protection with the supplies on, and feature 400 (max) on-resistance with 15 (max) matching between channels. The MAX4708/MAX4709 operate with dual supplies of 4.5V to 20V or a single supply of +9V to +36V. All digital inputs have TTL logiccompatible thresholds, ensuring both TTL and CMOS logic compatibility when using a single +12V supply or dual 15V supplies.