The LTC2901 is a programmable supply monitor for systems with up to four supply voltages. One of 16 preset or adjustable voltage monitor combinations can be selected using an external resistor divider connected to the program pin. The preset voltage thresholds are accurate to ±1.5% over temperature. All four voltage comparator outputs are connected to separate pins for individual supply monitoring.The reset and watchdog delay times are adjustable using external capacitors. Tight voltage threshold accuracy and glitch immunity ensure reliable reset operation without false triggering. TheRSToutput is guaranteed to be in the correct state for VCCdown to 1V. The LTC2901-1/LTC2901-3 features an open-drainRSToutput, while the LTC2901-2/LTC2901-4 has a push-pullRSToutput.The 43µA supply current makes the LTC2901 ideal for power conscious systems and it may be configured to monitor less than four inputs. The parts are available in the 16-lead narrow SSOP package.ApplicationsDesktop and Notebook ComputersMultivoltage SystemsTelecom EquipmentPortable Battery-Powered EquipmentNetwork Servers