20
FN8112.1
May 17, 2006
RESET/RESET/MR Timings
LOW VOLTAGE AND WATCHDOG TIMINGS PARAMETERS (@25°C, VCC = 5V)
Note: (1) Based on characterization data.
Symbol Parameters Min. Typ. Max. Unit
t
RPD1
(1)
t
RPDL
V
TRIP1
to RESET/RESET (Power-down only)
V
TRIP1
to LOWLINE
5µs
t
LR
(1)
LOWLINE to RESET/RESET delay (Power-down only) [= t
RPD1
-t
RPDL
] 500 ns
t
RPD2
(1)
V
TRIP2
to V2FAIL 5µs
t
PURST
Power-on Reset delay:
PUP1 = 0, PUP0 = 0
PUP1 = 0, PUP0 = 1 (Factory default)
PUP1 = 1, PUP0 = 0
PUP1 = 1, PUP0 = 1
50
(1)
200
400
(1)
800
(1)
ms
ms
ms
ms
t
F
V
CC,
V2MON
Fall Time 20 mVµs
t
R
V
CC,
V2MON
Rise Time 20 mVµs
V
RVALID
Reset Valid V
CC
1V
t
MD
(1)
MR to RESET/ RESET delay (activation only) 500 ns
t
in1
Pulse width Suppression Time for MR 50ns
t
WDO
Watchdog Timer Period:
WD1 = 0, WD0 = 0
WD1 = 0, WD0 = 1
WD1 = 1, WD0 = 0
WD1 = 1, WD0 = 1 (factory default)
1.4
(1)
200
(1)
25
OFF
s
ms
ms
t
RST1
Watchdog Reset Time Out Delay
WD1 = 0, WD0 = 0
WD1 = 0, WD0 = 1
100 200 300 ms
t
RST2
Watchdog Reset Time Out Delay WD1=1, WD0=0 12.5 25 37.5 ms
t
RSP
Watchdog timer restart pulse width 1 µs
V
CC
V
TRIP1
RESET
RESET
t
PURST
t
PURST
t
R
t
F
t
RPD1
V
RVALID
MR
t
MD
X40020, 40021
