DS1233Z-10

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1. DESCRIPTION

The DS1233Z-10 EconoReset monitors two vital conditions for 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 VCC returns 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 DS1233 is pushbutton reset control. The DS1233 debounces a pushbutton closure and will generate a 350ms reset pulse upon release.

2. FEATURES

    1. Automatically restarts microprocessor after power failure

    2. Monitors pushbutton for external override

    3. Internal circuitry debounces pushbutton switch

    4. Maintains reset for 350ms after VCC returns to an in-tolerance condition or pushbutton released

    5. Accurate 5%, 10%, or 15% microprocessor 5V power supply monitoring

    6. Reduces need for discrete components

    7. Precision temperature-compensated voltage reference and voltage sensor

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

    9. Internal 5k
pull-up resistor

  10. Operating temperature of -40C to +85C

3. Pin configuration

4. POWER MONITOR

The DS1233 provides the functions of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending power failure. When VCC is detected as out-of-tolerance, as defined by the tolerance of the part selected, the RST signal is asserted. On power-up, RST is kept active for approximately 350ms after the power supply has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST is released.

5. PUSHBUTTON RESET

The DS1233 provides for a pushbutton switch to be connected to the RST output pin. When the DS1233 is not in a reset cycle, it continuously monitors the RST signal for a low going edge. If an edge is detected, the DS1233 will debounce the switch by pulling the RST line low. After the internal timer has expired, the DS1233 will continue to monitor the RST line. If the line is still low, the DS1233 will continue to monitor the line looking for a rising edge. Upon detecting a release, the DS1233 will force the RST line low and hold it low for 350ms.