The open-drain output lets you wire-OR multiple supervisors or pull to a different logic level.
Two-channel monitoring — BOM consolidation
With two voltage monitors in one 8-SOIC, the ICL7665AESA+T replaces two single-channel supervisor ICs or a discrete comparator-and-reference circuit. That saves board area and reduces component count on multi-rail designs like FPGA power trees or automotive ECU supply sequencers. The adjustable threshold per channel gives flexibility to set trip points for different rail voltages.