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4
A6155
Timing Characteristics
V INPUT = 6.0 V, IL = 100 µA, CL = 10 µF + 100 nF, CINPUT = 22 µF, TJ = -40 to + 85 °C, unless otherwise specified
Parameter
Symbol Test Conditions
Min.
Typ.
Max.
Units
Propagation delays:
TCL to Output Pins
T
DIDO
250
500
ns
V
IN sensitivity
T
SEN
15
20
µs
Logic Transition Times on all Output Pins T
TR
Load 10 kΩ, 50 pF
30
100
ns
Power-on Reset delay
T
POR
R
EXT = 110 kΩ, ±1%
90
100
110
ms
Watchdog Time
T
WD
R
EXT = 110 kΩ, ±1%
90
100
110
ms
Open Window Percentage
OWP
±0.2 TWD
Closed Window Time
T
CW
0.8 T
WD
T
CW
R
EXT = 110 kΩ, ±1%
72
80
88
ms
Open Window Time
T
OW
0.4 T
WD
T
OW
R
EXT = 110 kΩ, ±1%
36
40
44
ms
Watchdog Reset Pulse
T
WDR
T
WD/40
T
WDR
R
EXT = 110 kΩ, ±1%
2.5
ms
T
CL Input Pulse Width
T
TCL
150
ns
Reset Pulse when switched to R internal
T
RI
0.3
0.9
2.3
s
Watchdog Reset Pulse with R internal (R
I)TRIR
T
RI/320
s
Table 4
TRI versus Temperature at VOUTPUT = 5 V
Timing Waveforms
Watchdog Timeout Period
2.5
2.0
1.5
1.0
0.5
0
-40
+25
+85
+125
T
J [°C]
Fig.3
T
WD = TPOR
T
CW – closed window
T
OW – open window
Watchdog
timer reset
Condition:
R
EXT = 110 kΩ
− OWP
− 20%
+ OWP
+ 20%
80
100
120
Fig. 4
t [ms]
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