MAX16998AAUA+

The MAX16998AAUA+ is a high voltage watchdog timer with adjustable timeout delay in 8 pin µMAX package. It is a microprocessor (μP) supervisory circuit for high input voltage and low quiescent current applications. This device detects downstream circuit failures and provides switchover to redundant circuitry. The MAX16998A has four independent inputs for reset and watchdog functions. SWT and SRT inputs independently set the timeout periods of watchdog and reset timers through external capacitors. RESETIN/EN monitor voltages at respective inputs. A resistive voltage divider sets the reset threshold. The MAX16998A generates two output signals complementary RESET and complementary ENABLE. Complementary RESET asserts whenever RESETIN drops below its threshold voltage or when the watchdog timer detects a timing fault at WDI. Once asserted and after all reset conditions are removed, complementary RESET remains low for the reset timeout period, tRESET and then goes high.

• Wide 5V to 40V input voltage range
• Automotive temperature range from -40°C to 125°C
• Windowed watchdog timer option
• 18μA quiescent current (typical at +125°C)
• Capacitor adjustable timeout period for watchdog and reset
• External voltage monitoring and power-on/power-off reset functionality
• TTL and CMOS compatible open-drain outputs and car battery compatible EN input
• Watch dog window size is 100%, WDI narrow pulse immunity
• Maximum open-drain enable output voltage is 28V and maximum open-drain reset output voltage of 18V
• Reset timeout period of 5ms

Applications

System Monitoring, Industrial

Warnings

Market demand for this product has caused an extension in leadtimes. Delivery dates may fluctuate. Product exempt from discounts.

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party