MIC1232

MIC1232 5V Voltage Supervisor with Manual Reset, Watchdog Timer and Dual Reset Outputs General Description The MIC1232 is a low-current microprocessor supervisor for monitoring 5V systems. The device features logic selectable (TOL) reset thresholds of 5% or 10% of 5V; a pushbutton reset input (/PBRST); a watchdog timer with three-state selectable (TD) timeout periods of 150ms, 600ms, or 1.2s; a fixed reset timeout period of 250ms (min); and active-low open-drain reset (/RST) and activehigh push-pull reset (RST) outputs. The /RST output maintains a valid reset condition for VCC as low as 1.4V. The MIC1232 asserts a reset condition if the supply voltage drops below the reset threshold, the pushbutton reset is asserted low, or the watchdog timer does not see a high-to-low transition on the watchdog timer input within the watchdog timer period. A reset condition is held for the reset timeout period of 250ms (min) after the pushbutton input is released or after the supply voltage increases above the reset threshold voltage. The MIC1232 is a drop-in replacement for the DS1232, MAX1232, and TC1232. It consumes a low 18µA (typ) of supply current, 40µA (max). This is one-tenth the max current of the DS1232, and one-quarter the max current of the MAX1232 and TC1232. It operates over the –40C to +85C temperature range and is available in the Pb-Free 8-pin SOIC and PDIP packages. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Features Low-...