Datasheet

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MR
t
t
t
t
V
(nom)
V
IT-
SENSEn
WDI
RESET
0
1
0
1
0
1
t
t(out)
t
d
t
d
t
d
t
d
RESETbecauseofWDI
RESETbecauseof MR
RESETbecauseofSENSEbelowV
IT-
RESETbecauseofSENSEbelowV
IT-
RESETbecause
ofSENSEbelowV
IT-
TIMING REQUIREMENTS
SWITCHING CHARACTERISTICS
TPS3305
SLVS198C – DECEMBER 1998 – REVISED MARCH 2008
TIMING DIAGRAM
At V
DD
= 2.7V to 6V, R
L
= 1M Ω , C
L
= 50pF, and T
J
= +25 ° C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SENSEn V
SENSEnL
= V
IT –
– 0.2V, V
SENSEnH
= V
IT+
+0.2V 6 µ s
t
w
Pulse width MR 100 ns
V
IH
= 0.7 × V
DD
, V
IL
= 0.3 × V
DD
WDI 100 ns
At V
DD
= 2.7V to 6V, R
L
= 1M Ω , C
L
= 50pF, and T
J
= +25 ° C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
I(SENSEn)
≥ V
IT+
+0.2V, MR ≥ 0.7 ×
t
t(out)
Watchdog time-out V
DD
1.1 1.6 2.3 s
See Timing Diagram
V
I(SENSEn)
≥ V
IT+
+0.2V, MR ≥ 0.7 × V
DD
t
d
Delay time 140 200 280 ms
See Timing Diagram
Propagation (delay) time, MR to RESET, V
I(SENSEn)
≥ V
IT+
+0.2V,
t
PHL
200 500 ns
high-to-low level output MR to RESET V
IH
= 0.7 × V
DD
, V
IL
= 0.3 × V
DD
Propagation (delay) time, MR to RESET, V
I(SENSEn)
≥ V
IT+
+0.2V,
t
PLH
200 500 ns
low-to-high level output MR to RESET V
IH
= 0.7 × V
DD
, V
IL
= 0.3 × V
DD
Propagation (delay) time, SENSEn to RESET, V
IH
= V
IT+
+0.2V, V
IL
= V
IT –
– 0.2V,
t
PHL
1 5 µ s
high-to-low level output SENSEn to RESET MR ≥ 0.7 × V
DD
Propagation (delay) time, SENSEn to RESET, V
IH
= V
IT+
+0.2V, V
IL
= V
IT –
– 0.2V,
t
PLH
1 5 µ s
low-to-high level output SENSEn to RESET MR ≥ 0.7 × V
DD
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