General Description：

The MAX16997/MAX16998 are microprocessor (μP)supervisory circuits for high-input-voltage and lowquiescent-current applications. These devices detectdownstream circuit failures and provide switchover toredundant circuitry. See the Selector Guide for thedifferent versions of this product family.The MAX16997/MAX16998 family has four independentinputs for reset and watchdog functions. SWT and SRTinputs independently set the timeout periods of watchdogand reset timers through external capacitors. RESETIN/EN monitor voltages at respective inputs. A resistivevoltage-divider sets the reset threshold.The MAX16998A/B/D generate two output signals, RESETand ENABLE. RESET asserts whenever RESETIN dropsbelow its threshold voltage or when the watchdog timerdetects a timing fault at WDI. Once asserted, and afterall reset conditions are removed, RESET remains lowfor the reset timeout period, tRESET, and then goes high.The MAX16997A generates one output signal (ENABLE)based on the voltage level at EN and the signal at WDI.The MAX16997A does not have a RESET output. Thewatchdog is disabled if the voltage at EN is below itsthreshold. The MAX16997A watchdog timer starts timingwhen the voltage at EN becomes higher than the presetthreshold voltage level. Each time EN rises above the preset threshold voltage, the initial watchdog timeout periodis 8 times the normal watchdog timeout period (tWP).The MAX16997/MAX16998 are available in 8-pinlead(Pb)-free μMAX® packages and are fully specifiedover the -40°C to +125°C automotive temperature range.

Features：

● Wide 5V to 40V Input Voltage Range

● 18μA Quiescent Current (Typical at +125°C)

● Capacitor-Adjustable Timeout Period for Watchdogand Reset

● Windowed Watchdog Timer Options (MAX16998B/D)

● External Voltage Monitoring (RESETIN for theMAX16998A/B/D and EN for the MAX16997A)

● Car Battery-Compatible EN Input

● TTL- and CMOS-Compatible Open-Drain Outputs

● 18V Maximum Open-Drain Reset Output Voltage

● 28V Maximum Open-Drain Enable Output Voltage

● Power-On/Power-Off Reset Functionality(MAX16998A/B/D Only)

● AEC-Q100 Qualified

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

● Small (3mm x 3mm) μMAX Package

● WDI Narrow Pulse Immunity

Applications：

● Automotive

● Industrial