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LTC2939 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC2939
Description  Confi gurable 4- and 6-Supply Monitors with Watchdog Timer
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2939 Datasheet(HTML) 6 Page - Linear Technology

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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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