General Description

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

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 with exposed pad and oper-

ates over the automotive temperature range of -40°C to

+125°C.

Applications

● Advanced Driver-Assistance Systems (ADAS)

● Automotive

● Multivoltage ASICs

● Servers

● 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

● 8-Pin TDFN Side-Wettable Package

● -40°C to +125°C Operating Temperature Range

Ordering Information appears at end of data sheet.

Typical Application Circuit

OV

IN

RST

WDO

WDI

GND

GND

RST

OUT

EN

IN

µC

NMI

MAX16136

µC

CLR

DC-DC

1.71V TO 5.5V

0.1µF

10kΩ

I/O

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MAX16136

High-Precision Supervisory ICs with Window

Watchdog and Overvoltage Indicator

19-100580; Rev 1; 6/21