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High-Precision Supervisory with Window
Watchdog and Overvoltage Indicator
The MAX16136, a low voltage, ±1% accurate window-de-
tector supervisor circuit monitors a single system supply
voltage and the integrity of code execution by a micro-
processor or microcontroller. This device features an ac-
tive-low, open-drain output that asserts whenever the
monitored supply rail falls outside of the factory-trimmed
undervoltage/overvoltage window threshold. The reset
output remain asserted for the programmed reset timeout
period after the monitored supply voltage falls within the
undervoltage/overvoltage window threshold.
The MAX16136 offers factory-trimmed voltage thresholds
from 0.5V to 5V in approximately 20mV increment. A va-
riety of factory trimmed undervoltage/overvoltage thresh-
olds from ±4% to ±11% are available to accommodate dif-
ferent supply voltages and tolerances.
A window-watchdog timer circuit monitors microprocessor
or microcontroller activity. During normal operation, the
microprocessor or microcontroller must repeatedly toggle
the watchdog input (WDI) low within the fast watchdog
timeout (tWD_F) and slow watchdog timeout (tWD_S). If
the microcontroller or microprocessor does not toggle WDI
within the window-timeout period, the supervisor asserts
the watchdog output (WDO) to signal that the system is
not executing code as expected. The watchdog output
pulse can be used to reset the microprocessor or micro-
controller, or it may be used to interrupt the system to
warn of execution errors.
In addition, the MAX16136 features an overvoltage fault
output (OV) that latches low when the monitored rail ex-
ceeds the overvoltage threshold. The latched output can
be cleared by pulling CLR low.
The MAX16136 is available in a small, 2mm x 2mm, 8-pin
TDFN side-wettable package and operates over the auto-
motive temperature range of -40°C to +125°C.
● Advanced Driver-Assistance Systems (ADAS)
● Multivoltage ASICs
● Storage Equipment
Benefits and Features
● ±1% Accuracy
● Enables ASIL Compliance at System Level
• FMEDA Results Available Upon Request
● 0.5V to 5V Threshold Range with 20mV Increments
● ±4% to ±11% Undervoltage/Overvoltage Thresholds
● Latched Overvoltage Fault Output
● Clear Fault Input
● 5μs Overvoltage Fault Delay
● Window Watchdog Timeout
● Factory-Set Reset Timeout
● Open-Drain Reset Output
● TDFN-8 Side-Wettable Package
● -40°C to +125°C Operating Temperature Range
Ordering Information appears at end of data sheet.
Typical Application Circuit
1.71V TO 5.5V
19-100580; Rev 0; 6/19