MAX694CSLASHD datasheet(15/18 Pages) MAXIM

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Table 2. Input and Output Status In Battery Backup Mode

VBATT, VOUT

VBATT is connected to VOUT via internal MOSFET.

RESET

Logic-low

RESET

Logic-high. The open circuit output voltage is equal to VOUT.

LOW LINE

Logic-low

BATT ON

Logic-high

WDI

WDI is internally disconnected from its internal pullup and does not source or sink current as long as its input

voltage is between GND and VOUT. The input voltage does not affect the source current.

WDO

Logic-high

PFI

The power-fail comparator is turned off and the power-fail input voltage has no effect on the power-fail output.

PFO

Logic-low

CE IN

CE IN is internally disconnected from its internal pullup and does not source or sink current as long as its input

voltage is between GND and VOUT. The input voltage does not affect the source current.

CE OUT

Logic-high

OSC IN

OSC IN is ignored.

OSC SEL

OSC SEL is ignored.

VCC

Approximately 12µA is drawn from the VBATT input when VCC is between VBATT +100mV and VBATT - 700mV.

The supply current is 1µA maximum when VCC is less than VBATT - 700mV.

MAX690–MAX695

Microprocessor Supervisory Circuits

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MAX694C/D Datasheet(PDF) 15 Page - Maxim Integrated Products