MAX16997AAUA+

MAXIM INTEGRATED PRODUCTS  MAX16997AAUA+  芯片, 微处理器监控器, 40V, UMAX-8

The 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 MAX16997A has four independent inputs for reset and watchdog functions. SWT and SRT inputs independently set 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. It generates one output signal complementary ENABLE based on voltage level at EN and signal at WDI. It does not has RESET complementary output. The MAX16997A watchdog timer starts timing when voltage at EN becomes higher than the preset threshold voltage level. Each time EN rises above preset threshold voltage, the initial watchdog timeout period is 8 times the normal watchdog timeout period.

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Wide 5V to 40V input voltage range

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Automotive temperature range from -40°C to 125°C

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18µA quiescent current typical at +125°C

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Capacitor adjustable timeout period for watchdog and reset

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External voltage monitoring

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Car battery compatible EN input

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TTL and CMOS compatible open-drain outputs

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Watch dog window size is 100%, WDI narrow pulse immunity

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Maximum open-drain enable output voltage is 28V

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Power-on reset input threshold voltage of 1.255V and reset timeout period of 5ms