Datasheet

MAX16997/MAX16998
High-Voltage Watchdog Timers with
Adjustable Timeout Delay
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 14V, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
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.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
(All pins referenced to GND, unless otherwise noted.)
IN, ENABLE ............................................................-0.3V to +45V
WDI, RESET, EN .....................................................-0.3V to +20V
RESETIN .................................................................-0.3V to +20V
SRT, SWT................................................................-0.3V to +12V
Maximum Current (all pins).................................................30mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.8mW/°C above +70°C) ..........387.8mW
Junction-to-Case Thermal Resistance (θ
JC
) (Note 1) ......42°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1).....206.3°C/W
Operating Temperature Range (T
A
) ..................-40°C to +125°C
Junction Temperature (T
J
) ...............................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range V
IN
5.0 40.0 V
T
A
= -40°C to +85°C 18 30
Supply Current I
IN
T
A
= -40°C to +125°C 18 60
µA
SWT Ramp Current I
RAMP_SWT
V
SWT
= 1.0V 450 500 550 nA
SRT Ramp Current I
RAMP_SRT
V
SRT
= 1.0V 410 500 600 nA
SWT/SRT Ramp Threshold
Voltage
V
RAMP
1.115 1.235 1.363 V
RESET TIMER
V
RESETIN
rising 1.135 1.255 1.383
Power-On Reset Input Threshold
Voltage
V
PON
V
RESETIN
falling 1.115 1.235 1.363
V
RESETIN Input Leakage Current I
LPON
V
RESETIN
= 2V 0.1 µA
RESET asserted, I
SINK
= 1mA 0.9
V
IN
= 1.1V, I
SINK
= 160µA, RESET asserted 0.4
RESET Output Low Voltage V
OLRST
RESET asserted, I
SINK
= 0.4mA 0.4
V
RESET Leakage Current I
LKGR
V
RESET
= 20V, RESET not asserted 0.1 µA
ENABLE Output Low Voltage V
OLEN
ENABLE asserted, I
SINK
= 5mA 0.4 V
ENABLE Leakage Current I
LKGE
V
ENABLE
= 14V, ENABLE not asserted 0.1 µA
Minimum Reset Timeout Period t
RESETmin
C
SRT
= 390pF (Note 3) 1 ms
Reset Timeout Period t
RESET
C
SRT
= 2000pF (Note 3) 5 ms
Maximum Reset Time Period t
RESETmax
C
SRT
= 47nF 116.09 ms
RESET to ENABLE Delay t
REDL
1.5 µs
RESETIN to RESET Delay t
RRDL
RESETIN falling below V
PON
to RESET
falling edge
1µs