Datasheet

Pin-Selectable Watchdog Timers
4
6
10
8
12
14
-40 10-15 35 60 85
SUPPLY CURRENT
vs. TEMPERATURE
MAX6369/74-01
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
V
CC
= +5.5V
V
CC
= +2.5V
Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
0.997
0.999
0.998
1.001
1.000
1.002
1.003
-40 10-15 35 60 85
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
MAX6369/74-02
TEMPERATURE (°C)
NORMALIZED WATCHDOG TIMEOUT PERIOD
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.5V to +5.5V, SET_ = V
CC
or GND, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C and
V
CC
= +3V.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
SET2
= 0V, V
SET1
= 0V, V
SET0
= 0V 3 9 ms
V
SET2
= 0V, V
SET1
= 0V, SET0 = V
CC
39
V
SET2
= 0V, SET1 = V
CC
, V
SET0
= 0V 1 3
s
V
SET2
= 0V, SET1 = V
CC
, SET0 = V
CC
Watchdog Disabled
SET2 = V
CC
, V
SET1
= 0V, V
SET0
= 0V 30 90 µs
SET2 = V
CC
, V
SET1
= 0V, SET0 = V
CC
13
SET2 = V
CC
, SET1 = V
CC
, V
SET0
= 0V 10 30
Watchdog Timeout
Period
t
WD
SET2 = V
CC
, SET1 = V
CC
, SET0 = V
CC
10 30
s
Watchd og Inp ut P ul se Wi d th
( N ote 2)
t
WDI
After WDO deasserted 100 ns
MAX6369/MAX6371/MAX6373 100 300 ms
Watchdog Output Pulse Width t
WDO
MAX6370/MAX6372/MAX6374 1 3 ms
Internal Setup Time
(Note 4)
t
SETUP
After WDO deasserted 100 300 ms
Note 1: Production tested at T
A
= +25°C. Guaranteed by design over temperature limits.
Note 2: Guaranteed by design.
Note 3: In this setting the watchdog timer is inactive and startup delay ends when WDI sees its first level transition. See the
Selecting
Device Timing
section for more information.
Note 4: After power-up, or a setting change, there is an internal setup time during which WDI is ignored.
4
Maxim Integrated
MAX6369–MAX6374