
M
Pin-Selectable Watchdog Timers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
V
CC
.....................................................................-0.3V to +6V
WDI.....................................................................-0.3V to +6V
WDO
(Open Drain: MAX6369/71/73) .................-0.3V to +6V
WDO
(Push-Pull: MAX6370/72/74 .......-0.3V to (V
CC
+ 0.3V)
SET0, SET1, SET2 ................................-0.3V to (V
CC
+ 0.3V)
Maximum Current, Any Pin (input/output)...........................20mA
ELECTRICAL CHARACTERISTICS
(V
CC
= +2.5V to +5.5V, SET_ = V
CC
or GND, T
A
= -40
°
C to +85
°
C, unless otherwise noted. Typical values are at T
A
= +25
°
C and
V
CC
= +3V.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Continuous Power Dissipation (T
A
= +70
°
C)
SOT23-8 (derate 8.75mW/
°
C above +70
°
C)...............700mW
Operating Temperature Range ...........................-40
°
C to +85
°
C
Storage Temperature Range.............................-65
°
C to +150
°
C
Junction Temperature......................................................+150
°
C
Lead Temperature (soldering, 10s).................................+300
°
C
V
CC
Rise or Fall Rate......................................................0.05V/μs
PARAMETER
SYMBOL
V
CC
I
CC
V
IH
CONDITIONS
MIN
2.5
TYP
MAX
5.5
20
UNITS
V
μA
V
Operating Voltage Range
Supply Current
Input High Voltage
No load
WDI, SET0, SET1, SET2
8
0.8
×
V
CC
V
CC
≥
3.3V
V
CC
≥
2.5V
0.8
0.6
±10
Input Low Voltage
V
IL
WDI, SET0, SET1,
SET2
V
Logic Input Current (Note 2)
WDI or SET_ = 0 or V
CC
I
SINK
= 1.2mA, V
CC
> 2.7V, watchdog
output asserted
0
nA
0.3
V
WDO
Output Low
Voltage
V
OL
I
SINK
= 6mA, V
CC
> 4.5V, watchdog
output asserted
0.4
V
WDO
Leakage Current
I
LKG
V
NDO
= 0 to +5.5V, output deasserted,
MAX6369/MAX6371/MAX6373
1
μA
I
SOURCE
= 500μA, V
CC
> 2.7V, watchdog
output deasserted
0.8
×
V
CC
WDO
Output High
Voltage
V
OH
I
SOURCE
= 800μA, V
CC
> 4.5V, watchdog
output deasserted
V
CC
- 1.5
V
MAX6369/MAX6370
SET2 = 0, SET1 = 0, SET0 = 0
SET2 = 0, SET1 = 0, SET0 = V
CC
SET2 = 0, SET1 = V
CC
, SET0 = 0
SET2 = 0, SET1 = V
CC
, SET0 = V
CC
SET2 = V
CC
, SET1 = 0, SET0 = 0
SET2 = V
CC
, SET1 = 0, SET0 = V
CC
SET2 = V
CC
, SET1 = V
CC
, SET0 = 0
SET2 = V
CC
, SET1 = V
CC
, SET0 = V
CC
1
10
30
Watchdog Disabled
100
1
10
60
3
30
90
ms
300
3
30
180
ms
Startup Delay Period
t
DELAY
s