Datasheet
6
LTC2900
2900f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
RST Pull-Up Current vs V2
(LTC2900-1)
V2 (V)
2
0
PULL-UP CURRENT (µA)
4
8
12
2.5
3
3.5 4
2900 G22
4.5
16
20
2
6
10
14
18
5
T
A
= 25°C
V
RT25
V
RT30
V
RT33
RST Pull-Up Current vs V2
(LTC2900-2)
V2 (V)
2
0
PULL-UP CURRENT (mA)
2
4
5
2.5
3
3.5 4
2900 G23
4.5
1
3
6
5
T
A
= 25°C
V
RT25
V
RT30
V
RT33
RST, I
SINK
vs Supply Voltage
V1 OR V2 (V)
0
0
I
SINK
(mA)
2
4
6
1
2
34
2900 G17
5
9
13
1
3
5
7
11
8
12
10
6
V
OL
= 0.4V
T
A
= 25°C
V
OL
= 0.2V
RST Voltage Output Low
vs Output Sink Current
RST High Level Output Voltage
vs Output Source Current
(LTC2900-2)
I
SINK
(mA)
0
V
OL
(V)
20
40
50 90
2900 G18
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
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
2900 G19
2.5
1.51
85°C
25°C
–40°C
V1 = 5V
V2 = 3V
V3 = 2.5V
V4 = 1V
RST Output Voltage
vs V1, V
PG
= 0V
Reset Time-Out Period
vs Temperature
Reset Time-Out Period
vs Capacitance
V1 (V)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
RST OUTPUT VOLTAGE (V)
2900 G14
5
4
3
2
1
0
V1 = V2 = V3 = V4
10k PULL-UP FROM RST TO V1
T
A
= 25°C
TEMPERATURE (°C)
–60
4.9
RESET TIME-OUT PERIOD, t
RST
(ms)
5.4
6.4
6.9
8.9
7.9
–20
20
40
2900 G15
5.9
8.4
7.4
–40 0
60
80
100
C
RT
= 1500pF
(SILVER MICA)
C
RT
(FARAD)
10p 100p 10n 1µ
10
1
100m
10m
1m
100µ
2900 G16
1n
100n
RESET TIME-OUT PERIOD, t
RST
(sec)
T
A
= 25°C