Datasheet

LTC1726
5
1726fd
For more information www.linear.com/LTC1726
Typical perForMance characTerisTics
Watchdog Time-Out Period vs
Capacitance
Reset Time-Out Period vs
Capacitance
RST Output Voltage vs
Supply Voltage (LTC1726-2.5)
V
CCA
Input Current
vs Input Voltage
Watchdog Time-Out Period
vs Temperature
Reset Pulse Width vs
Temperature
I
VCC25
vs Temperature
(LTC1726-2.5)
I
VCC3
vs Temperature
(LTC1726-2.5)
Typical Transient Duration
vs Comparator Overdrive
TEMPERATURE (°C)
–60
0.5
I
VCC25
(µA)
0.6
0.8
0.9
1.0
1.5
1.2
–20
20
40
1726 G07
0.7
1.3
1.4
1.1
–40 0
60
80
100
V
CC3
= 3.3V
V
CC25
= 2.5V
TEMPERATURE (°C)
–60
10
I
VCC3
(µA)
11
13
14
15
20
17
–20
20
40
1726 G08
12
18
19
16
–40 0
60
80
100
V
CC3
= 3.3V
V
CC25
= 2.5V
RESET COMPARATOR OVERDRIVE VOLTAGE (% OF V
CC
)
0.1
400
TYPICAL TRANSIENT DURATION (µs)
500
600
700
1 10 100
1726 G09
300
200
100
0
RESET OCCURS
ABOVE CURVE
T
A
= 25°C
TEMPERATURE (°C)
–60 –40
WATCHDOG TIME PERIOD, t
WT
(ms)
34
36
38
60 80
1726 G10
32
30
–20 0 20 40 100
28
26
40
C
WT
= 1500pF
(SILVER MICA)
INPUT VOLTAGE (V)
0.80 0.85 0.95 1.05 1.15
INPUT CURRENT (nA)
0
1.0
1.20
1726 G14
–1.0
–2.0
–0.5
–1.5
0.90
1
1.10
2.0
0.5
1.5
T
A
= 25°C
TEMPERATURE (°C)
–60
4.0
RESET PULSE WIDTH, t
RT
(ms)
4.2
4.6
4.8
5.0
6.0
5.4
–20
20
40
1726 G11
4.4
5.6
5.8
5.2
–40 0
60
80
100
C
RT
= 1500pF
(SILVER MICA)
V
CC3
(V)
0
2
1726 F13
1
1
2 3
0
3
RST OUTPUT VOLTAGE (V)
V
CC3
= V
CC25
= V
CCA
10k PULL-UP FROM V
CC3
TO RST
T
A
= 25°C
C
WT
(FARAD)
10p1p 100p 10n 1
1000
100
10
1
100m
10m
1m
100
1726 G12
1n
100n
10
WATCHDOG TIME-OUT PERIOD, t
WT
(sec)
T
A
= 25°C
C
RT
(FARAD)
10p1p 100p 10n 1
100
10
1
100m
10m
1m
100
10
1726 G15
1n
100n 10
RESET TIME-OUT PERIOD, t
RT
(sec)
T
A
= 25°C
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