LTC2939 datasheet(6/20 Pages) LINER

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LTC2938/LTC2939

293839ff

TYPICAL PERFORMANCE CHARACTERISTICS

WDO Pull-Up Current vs V2

WDI Input Threshold

vs Temperature

ISINK vs Supply Voltage (RST)

Voltage Output Low

vs Sink Current (RST, WDO)

WDI Input Current vs Temperature

CRT: Reset Timeout Capacitor. Attach an external capaci-

tor (CRT) to GND to set a reset timeout of 2ms/nF. A 47nF

capacitor generates a 94ms reset delay time. Leaving CRT

unconnected generates a minimum timeout period of ap-

proximately 20μs which will vary depending on parasitic

capacitance on the pin.

TEMPERATURE (°C)

–50

–20

–15

–5

–10

–25

100

125

29389 G15

VWDI = 5V

VWDI = 0.7V

VWDI = 0V

VWDI = 1.1V

TEMPERATURE (°C)

–50

0.50

0.75

1.50

1.25

1.00

–25

100

125

29389 G17

HIGH

LOW

OPEN (MINIMUM)

OPEN (MAXIMUM)

V1 OR V2 (V)

29389 G13

TA = 25°C

VOL = 0.4V

VOL = 0.2V

125°C

ISINK (mA)

300

400

500

29389 G14

200

100

V1 = 5V

V2 = 3V

85°C

–40°C

25°C

V2 (V)

29389 G16

TA = 25°C

WDO = GND

PIN FUNCTIONS

CWT: Watchdog Timeout Capacitor. Attach a capacitor (CWT)

between CWT and GND to set a watchdog timeout period

of 20ms/nF. A 47nF capacitor generates a 940ms watchdog

timeout period. Leaving CWT unconnected generates a

minimum timeout period of approximately 200μs which

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