LTC2939 データシートの表示（PDF） - Linear Technology
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LTC2939 Datasheet PDF : 20 Pages
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LTC2938/LTC2939
TYPICAL PERFORMANCE CHARACTERISTICS
ISINK vs Supply Voltage (RST)
15
TA = 25°C
12
VOL = 0.4V
9
VOL = 0.2V
6
3
0
0
1
2
3
4
5
V1 OR V2 (V)
29389 G13
Voltage Output Low
vs Sink Current (RST, WDO)
500
V1 = 5V
V2 = 3V
400
125°C
85°C
300
25°C
200
–40°C
100
0
0
2
4
6
8
10
ISINK (mA)
29389 G14
WDI Input Current vs Temperature
20
VWDI = 5V
15
VWDI = 1.1V
10
5
0
–5
–10
–15
–20
–50 –25
VWDI = 0V
VWDI = 0.7V
0 25 50 75 100 125
TEMPERATURE (°C)
29389 G15
WDO Pull-Up Current vs V2
18
TA = 25°C
WDO = GND
15
12
WDI Input Threshold
vs Temperature
1.50
HIGH
1.25
OPEN (MAXIMUM)
9
1.00
6
3
0
1
2
3
4
5
V2 (V)
29389 G16
0.75
LOW
OPEN (MINIMUM)
0.50
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
29389 G17
PIN FUNCTIONS
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.
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
293839ff
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