Datasheet

LT3689/LT3689-5
8
3689fe
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TYPICAL PERFORMANCE CHARACTERISTICS
Watchdog Upper Boundary Period Watchdog Lower Boundary Period
Reset Timeout Period
Watchdog Upper Boundary Period
vs Capacitance
Reset Timeout Period
vs Capacitance
Transient Duration
vs POR Comparator Overdrive
POR COMPARATOR OVERDRIVE VOLTAGE AS PERCENTAGE
OF RESET THRESHOLD, V
RST
(%)
0.10
400
TRANSIENT DURATION (µs)
500
600
700
800
1.00 10.00 100.00
300
200
100
0
3689 G30
RESET OCCURS
ABOVE THE CURVE
TEMPERATURE (°C)
17
UPPER BOUNDARY PERIOD, t
WDU
(ms)
18
19
20
21
3689 G31
–50 –25
0
25 50 10075 125 150
C
WDT
= 1nF
MURATA:
GRM1882C1H102FA01
TEMPERATURE (°C)
5.0
LOWER BOUNDARY PERIOD, t
WDL
(ms)
5.5
6.0
6.5
7.0
3689 G32
–50 –25
0
25 50 10075 125 150
C
WDT
= 10nF
MURATA:
GRM1885C1H102FA01
TEMPERATURE (°C)
17
RESET TIMEOUT PERIOD, t
RST
(ms)
18
19
20
21
3689 G33
–50 –25
0
25 50 10075 125 150
C
POR
= 8.2nF
MURATA:
GRM2195C1H822FA01
0.001 0.01 0.1 1 10 100 1000
C
WDT
PIN CAPICITANCE, C
WDT
(nF)
UPPER BOUNDARY PERIOD, t
WDU
(ms)
3689 G34
100
10000
0.1
1
100000
1000
10
C
POR
PIN CAPICITANCE, C
POR
(nF)
RESET TIMEOUT PERIOD, t
RST
(ms)
3689 G35
10
1000
0.01
0.1
10000
100
1
0.001 0.01 0.1 1 10 100 1000 10000
Watchdog Lower Boundary Period
vs Capacitance
C
WDT
PIN CAPICITANCE, C
WDT
(nF)
LOWER BOUNDARY PERIOD, t
WDL
(ms)
3689 G36
10
1000
0.01
0.1
10000
100
1
0.001 0.01 0.1 1 10 100 1000 10000