Datasheet

LTC2908
5
2908fd
TYPICAL PERFORMANCE CHARACTERISTICS
Specifi cations are at T
A
= 25°C unless otherwise noted.
1.8V Threshold Voltage
vs Temperature
1.5V Threshold Voltage
vs Temperature
ADJ Threshold Voltage
vs Temperature
I
V1
vs Temperature I
V2
vs Temperature I
V3
vs Temperature
I
V4
vs Temperature
Typical Transient Duration
vs Comparator Overdrive
Reset Time-Out Period (t
RST
)
vs Temperature
TEMPERATURE (°C)
–50
1.710
1.700
1.690
1.680
1.670
1.660
25 75
2908 G04
–25 0
50 100
THRESHOLD VOLTAGE, V
RT18
(V)
TEMPERATURE (°C)
–50
THRESHOLD VOLTAGE, V
RT15
(V)
50
1.425
2908 G05
0
–25
75
25 100
1.410
1.405
1.400
1.395
1.390
1.385
1.380
1.415
1.420
TEMPERATURE (°C)
–50
THRESHOLD VOLTAGE, V
RTADJ
(V)
0.4980
0.5000
0.5020
25
75
2908 G06
0.4960
0.4940
0.4920
–25 0 50
0.5040
0.5060
0.5080
100
TEMPERATURE (°C)
–50
I
V1
(μA)
17
19
21
23
29
31
33
27
–25
02550
2908 G07
75 100
25
A1 B1
C1
V1 = 5.0V (A1)/V1 = 3.3V (B1)/V1 = 2.5V (C1)
V2 = 3.3V (A1)/V2 = 2.5V (B1)
V3 = 2.5V (A1)/V3 = 1.8V (B1)
V4 = 1.8V (A1)/V1 = 1.5V (B1)
V
ADJ1
= V
ADJ2
= V
ADJ3
=
V
ADJ4
=V
ADJ5
= 0.55V
TEMPERATURE (°C)
–50
I
V2
(μA)
8
9
A1 B1
10
25
75
2908 G08
7
6
4
5
–25 0 50
11
12
14
13
100
V1 = 5.0V (A1)/V1 = 3.3V (B1)
V2 = 3.3V (A1)/V2 = 2.5V (B1)
V3 = 2.5V (A1)/V3 = 1.8V (B1)
V4 = 1.8V (A1)/V4 = 1.5V (B1)
V
ADJ1
= V
ADJ2
= 0.55V
TEMPERATURE (°C)
–50
I
V3
(μA)
1.7
1.8
1.9
25
75
2908 G09
1.6
1.5
1.4
–25 0 50
2.0
2.1
2.2
100
V1 = 5.0V (A1)/V1 = 3.3V (B1)
V2 = 3.3V (A1)/V2 = 2.5V (B1)
V3 = 2.5V (A1)/V3 = 1.8V (B1)
V4 = 1.8V (A1)/V4 = 1.5V (B1)
V
ADJ1
= V
ADJ2
= 0.55V
TEMPERATURE (°C)
–50
I
V4
(μA)
1.7
1.8
1.9
25
75
2908 G10
1.6
1.5
1.4
–25 0 50
2.0
2.1
2.2
100
V1 = 5.0V (A1)/V1 = 3.3V (B1)
V2 = 3.3V (A1)/V2 = 2.5V (B1)
V3 = 2.5V (A1)/V3 = 1.8V (B1)
V4 = 1.8V (A1)/V4 = 1.5V (B1)
V
ADJ1
= V
ADJ2
= 0.55V
COMPARATOR OVERDRIVE VOLTAGE (% OF V
RTX
)
0.1
400
TYPICAL TRANSIENT DURATION (μs)
500
600
700
1 10 100
2908 G11
300
200
100
0
RESET OCCURS
ABOVE CURVE
T
A
= 25°C
TEMPERATURE (°C)
–50
RESET TIME-OUT PERIOD, t
RST
(ms)
190
200
210
25
75
2908 G12
180
170
150
160
–25 0 50
220
230
250
240
100