Datasheet

7
LTC2901
2901fb
RST, WDO, COMPX Voltage
Output Low vs Output Sink Current
RST High Level Output Voltage
vs Output Source Current
(LTC2901-2/LTC2901-4)
RST, WDO, COMPX I
SINK
vs Supply Voltage
TYPICAL PERFOR A CE CHARACTERISTICS
UW
V1 OR V2 (V)
0
0
I
SINK
(mA)
2
4
6
1
2
34
2901 G19
5
8
10
1
3
5
7
9
6
V
OL
= 0.4V
T
A
= 25°C
V
OL
= 0.2V
I
SINK
(mA)
0
V
OL
(V)
20
40
50 90
2901 G20
10 30
60
70
80
3.0
2.5
2.0
1.5
1.0
0.5
0
85°C
25°C
–40°C
V2 = 3V
V1 = 5V
Reset Time-Out Period
vs Capacitance
C
RT
(FARAD)
10p 100p 10n 1μ
10
1
100m
10m
1m
100μ
2901 G18
1n
100n
RESET TIME-OUT PERIOD, t
RST
(sec)
T
A
= 25°C
I
SOURCE
(mA)
0 0.5 2
V
OH
(V)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
2901 G21
2.5
1.51
85°C
25°C
–40°C
V1 = 5V
V2 = 3V
V3 = 2.5V
V4 = 1V
Watchdog Time-Out Period
vs Capacitance
C
WT
(FARAD)
10p 100p 10n 1μ
100
10
1
100m
10m
1m
2901 G17
1n
100n
WATCHDOG TIME-OUT PERIOD, t
WD
(sec)
T
A
= 25°C
V2 (V)
1
0
PULL-UP CURRENT (μA)
2
6
8
10
20
14
2
3
3.5
2901 G24
4
16
18
12
1.5 2.5
4
4.5
5
T
A
= 25°C
COMPX and WDO Pull-Up
Current vs V2 (COMPX and
WDO Held at 0V)
COMPX Propagation Delay vs Input
Overdrive Above Threshold
INPUT OVERDRIVE ABOVE THRESHOLD (mV)
COMPX PROPAGATION DELAY (μs)
250
200
V1, V2
V3, V4
150
2901 G25
0
100
50
1000
10 100
T
A
= 25°C
RST Pull-Up Current vs V2
(LTC2901-1/LTC2901-3)
RST Pull-Up Current vs V2
(LTC2901-2/LTC2901-4)
V2 (V)
2
0
PULL-UP CURRENT (μA)
4
8
12
2.5
3
3.5 4
2901 G26
4.5
16
20
2
6
10
14
18
5
T
A
= 25°C
V
RT25
V
RT30
V
RT33
V2 (V)
2
0
PULL-UP CURRENT (mA)
2
4
5
2.5
3
3.5 4
2901 G27
4.5
1
3
6
5
T
A
= 25°C
V
RT25
V
RT30
V
RT33