CAT1232LPGW-T13

The CAT1232LP and CAT1832 microprocessorsupervisors can halt and restart a "hung-up" or "stalled"microprocessor, restart a microprocessor after a powerfailure, and debounce a manual/push-button micro-processor reset switch. The devices are drop inreplacements for the Maxim/Dallas SemiconductorDS1232LP and DS1832 supervisors

Precision reference and comparator circuits monitor the5V or 3.3V system power supply voltage, VCC. Duringpower-up or when the power supply falls outsideselectable tolerance limits, both the RESET and RESETbecome active. After the power supply voltage risesabove the RESET threshold voltage, the reset signalsremain active for a minimum of 250ms, allowing thepower supply and system processor to stabilize. Thetrip-point tolerance input, TOL, selects the trip leveltolerance to be either 5% or 10% for the CAT1232LP 5Vupply and 10% or 20% for the CAT1832 3.3V supply.

Each device has a push-pull, active HIGH reset output.The CAT1232LP also has an open drain, active LOWreset output while the CAT1832 also has a push-pull,active LOW reset output.

A debounced manual reset input activates the resetoutputs and holds them active for a minimum period of250ms after being released.

Also included is a watchdog timer to reset amicroprocessor that has stopped due to a software orhardware failure. Three watchdog time-out periods areselectable: 150ms, 600ms and 1.2sec. If the ST input isnot strobed low before the watchdog time out periodexpires, the reset signals become active for a minimumof 250ms.