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LTC2939 Datasheet(PDF) 6 Page - Linear Technology |
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LTC2939 Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page LTC2938/LTC2939 6 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 0 5 20 15 0 50 75 –10 10 –25 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 0 50 75 1.00 –25 25 100 125 29389 G17 HIGH LOW OPEN (MINIMUM) OPEN (MAXIMUM) V1 OR V2 (V) 0 9 12 15 4 29389 G13 6 3 0 1 2 3 5 TA = 25°C VOL = 0.4V VOL = 0.2V 125°C ISINK (mA) 0 300 400 500 8 29389 G14 200 100 0 2 4 6 10 V1 = 5V V2 = 3V 85°C –40°C 25°C V2 (V) 1 0 3 6 9 12 15 18 23 4 5 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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