The TC54 series are CMOS voltage detectors that are especially well suited for battery-powered applications because of their extremely low 1 µA operating current and small surface-mount packaging. Each part is laser- trimmed to the desired threshold voltage, which can be specified from 1.4V to 6.0V with a 2% tolerance. The TC54 is available with either an open-drain or com- plementary output stage. During operation, the TC54's output (VOUT) remains in the logic-high state as long as VIN is greater than the specified threshold voltage (VDET –). When VIN falls below VDET –, the output is driven to a logic-low. VOUT remains low until VIN rises above VDET – by an amount VHYST, whereupon it resets to a logic-high.