LTC694-3.3 데이터 시트보기 (PDF) - Linear Technology

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LTC694-3.3

3.3V Microprocessor Supervisory Circuits

Linear Technology 

LTC694-3.3/LTC695-3.3

PIN FUNCTIONS

WDI: Watchdog Input. WDI is a three-level input. Driving

WDI either high or low for longer than the watchdog timeout

period, forces both RESET and WDO low. Floating WDI

disables the watchdog timer. The timer resets itself with

each transition of the watchdog input (see Figure 11).

WDO: Watchdog Logic Output. When the watchdog input

remains either high or low for longer than the watchdog

timeout period, WDO goes low. WDO is set high_ whenever

there is a transition on the WDI pin, or LOW LINE goes

low. The watchdog timer can be disabled by floating WDI

(see Figure 11).

BLOCK DIAGRAM

VBATT

VCC

CE IN

PFI

OSC IN

OSC SEL

WDI

M2

M1

–

C2

+

+

C1

–

1.3V

GND

–

C3

+

OSC

TRANSITION

DETECTOR

CHARGE

PUMP

RESET PULSE

GENERATOR

WATCHDOG

TIMER

VOUT

BATT ON

LOW LINE

CE OUT

PFO

RESET

RESET

WDO

694/5-3.3 BD

69453fb

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