MAX690C 查看數據表（PDF） - Maxim Integrated

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MAX690C

Microprocessor Supervisory Circuits

Maxim Integrated 

MAX690–MAX695

Microprocessor Supervisory Circuits

Table 2. Input and Output Status In Battery Backup Mode

VBATT, VOUT

RESET

RESET

LOW LINE

BATT ON

WDI

WDO

PFI

PFO

CE IN

CE OUT

OSC IN

OSC SEL

VCC

VBATT is connected to VOUT via internal MOSFET.

Logic-low

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

Logic-low

Logic-high

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.

Logic-high

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

Logic-low

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.

Logic-high

OSC IN is ignored.

OSC SEL is ignored.

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.

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