6
LTC2902
2902f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Typical Transient Duration
vs Comparator Overdrive (V1, V2)
RST Output Voltage
vs V1, V
PG
= 0V
Reset Time-Out Period
vs Temperature
Reset Time-Out Period
vs Capacitance
I
V4
vs Temperature
RST, COMPX I
SINK
vs Supply Voltage
TEMPERATURE (°C)
–60
0
I
V4
(µA)
0.1
0.3
0.4
0.5
1.0
0.7
–20
20
40
2902 G13
0.2
0.8
0.9
0.6
–40 0
60
80
100
V1 = 5V
V2 = 3.3V
V3 = 2.5V
V4 = 1.8V
RESET COMPARATOR OVERDRIVE VOLTAGE (% OF V
RTX
)
0.1
250
TYPICAL TRANSIENT DURATION (µs)
300
350
400
450
1 10 100
2902 G14
200
150
50
0
100
RESET OCCURS
ABOVE CURVE
T
A
= 25°C
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)
2902 G15
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)
5.9
6.4
6.9
8.9
7.9
–20
20
40
2902 G16
5.4
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
2902 G17
1n
100n
RESET TIME-OUT PERIOD, t
RST
(sec)
T
A
= 25°C
V1 OR V2 (V)
0
0
I
SINK
(mA)
2
4
6
1
2
34
2902 G18
5
8
10
1
3
5
7
9
6
V
OL
= 0.4V
T
A
= 25°C
V
OL
= 0.2V
RST, COMPX Voltage Output Low
vs Output Sink Current
RST High Level Output Voltage
vs Output Source Current
(LTC2902-2)
I
SINK
(mA)
0
V
OL
(V)
20
40
50 90
2902 G19
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
2902 G20
2.5
1.51
85°C
25°C
–40°C
V1 = 5V
V2 = 3V
V3 = 2.5V
V4 = 1V
RESET COMPARATOR OVERDRIVE VOLTAGE (% OF V
RTX
)
0.1
80
TYPICAL TRANSIENT DURATION (µs)
100
120
140
160
1 10 100
2902 G25
60
40
20
0
200
180
220
T
A
= 25°C
RESET OCCURS
ABOVE CURVE
Typical Transient Duration
vs Comparator Overdrive (V3, V4)
