Datasheet

LTC2938/LTC2939
5
293839ff
TYPICAL PERFORMANCE CHARACTERISTICS
RST Pull-Up Current vs V2
RST Output Voltage vs V1,
V
PG
= GND
Watchdog Timeout Period
vs Temperature
Reset Timeout Period
vs Temperature Watchdog Timeout Period vs C
WT
Reset Timeout Period vs C
RT
Supply Current vs Temperature I(V4) vs V4 in –ADJ mode
Transient Duration
vs Comparator Overdrive
TEMPERATURE (°C)
–50
SUPPLY CURRENT, I
V1
(μA)
80
85
90
25 75
29389 G04
75
–25 0
50 100 125
70
V1 = 5V
V2 = 3.3V
V3 = 2.5V
V4 = 1.8V
V5 = V6 = 1V
V4 (mV)
I
V4
(A)
29389 G05
–100μ
–10μ
–1μ
–100n
–10n
–1n
–100p
–300 –250 –200 –50 0–100–150
125°C
85°C
25°C
RESET COMPARATOR OVERDRIVE (% OF V
RTX
)
0.1
0
TYPICAL TRANSIENT DURATION (μs)
200
300
400
250
350
1 10 100
29389 G06
150
100
50
T
A
= 25°C
RESET OCCURS
ABOVE CURVE
V2 (V)
1
0
PULL-UP CURRENT (μA)
3
6
9
12
18
2
1.50.5
2.5
3 3.5 4
29389 G07
4.5 5
15
T
A
= 25°C
V
RT12
V
RT18
V
RT15
V
RT25
V
RT33
V1 (V)
0
0
RST OUTPUT VOLTAGE (V)
1
2
3
4
5
6
1234
29389 G08
5
T
A
= 25°C
10k PULL-UP FROM RST TO V1
V1 = V2
TEMPERATURE (°C)
–50
WATCHDOG TIMEOUT PERIOD, t
WD
(ms)
32
34
36
25 75
29389 G09
30
28
–25 0
50 100 125
26
24
C
WT
= 1500pF
(SILVER MICA)
TEMPERATURE (°C)
–50
1
RESET TIMEOUT PERIOD, t
RST
(ms)
2
3
4
5
–25 0 25 50
29389 G10
75 100 125
C
RT
= 1500pF
(SILVER MICA)
C
WT
(F)
WATCHDOG TIMEOUT PERIOD t
WD
(s)
29389 G11
100
10
1
100m
10m
1m
100μ
10p 100p 1n 100n 1μ10n
T
A
= 25°C
C
RT
(F)
RESET TIMEOUT PERIOD t
RST
(s)
29389 G12
10
1
100m
10m
1m
100μ
10μ
10p 100p 1n 100n 1μ10n
T
A
= 25°C