DESCRIPTION

The DS1233A EconoReset monitors two vital conditionsfor a microprocessor: power supply and external override. A precision temperature-compensated reference and comparator circuit are used to monitor the status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal power fail signal is generated which forces reset to the active state. When VCCreturns to an in-tolerance condition, the reset signal is kept in the active state for approximately 350ms to allow the power supply and processor to stabilize. The second function of the DS1233A is pushbutton reset control. The DS1233A debounces a pushbutton closure and will generate a 350ms reset pulse upon release.

FEATURES

Automatically restarts microprocessor after power failure

Monitors pushbutton for external override

Internal circuitry debounces pushbutton switch

Maintains reset for 350ms after VCCreturns to an in-tolerance condition or pushbutton

released

Accurate 10% or 15% microprocessor 3.3V power supply monitoring

Reduces need for discrete components

Precision temperature-compensated voltage reference and voltage sensor

Low-cost TO-92 package or surface mount SOT-223 package

Internal 5k
pull-up resistor

Operating temperature of -40C to +85C