View max6509 datasheet:

19-1617; Rev 1b; 9/00 Resistor-Programmable SOT Temperature Switches ________________General Description ____________________________Features The MAX6509/MAX6510 are fully integrated, resistor- ¦ ±0.5°C Threshold Accuracy programmable temperature switches with thresholds ¦ ±4.7°C (max) Threshold Accuracy (-40°C to +125°C) set by an external resistor. They require only one exter- ¦ Temperature Threshold Set by a 1% External nal resistor to set the temperature threshold within a Resistor wide -40°C to +125°C temperature range. The MAX6509 provides an open-drain output. The MAX6510 features ¦ Set-Hot or Set-Cold Option three selectable output options: active-low, active-high, ¦ Low 32µA Supply Current and open drain with an internal pull-up resistor. ¦ Open-Drain, Push-Pull