MAX693AMJE

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Power Management Integrated Circuits (PMICs) are semiconductor components used in electronic devices. They are predominantly used in two areas of electronic device design: power supply regulation and protection, and system logic and control. Supervisors are specialised varieties of PMICs that monitor the supply voltages and clocks to ensure proper operation of the device. The MAX693AMJE is a suitable example of a supervisor from Maxim Integrated, providing a comprehensive feature set for the protection of power supply voltages and system clocks.

The MAX693AMJE consists of an adjustable supply monitor, a push-pull output driver, an active-LOW reset output, and a watchdog timer with a selectable timeout period. It is fabricated using advanced low-power CMOS technology and is designed to operate from a 2.7-5.5V supply range. It is packaged in a 6-pin SOT143W surface-mount package and is rated to operate over a range of 0°C - 70°C.

Application Field

The primary application of the MAX693AMJE is the monitoring of a single supply voltage and resetting the system when an abnormal power-down occurs. It may be used as a circuit supervisor in precision digital oscillators, system power rails, converters, digital controllers, clock circuits and various other digital system components. It is typically used to provide safe startup, reset, power-up/power-down sequencing, reset generation and pulse stretching.

Working Principle

The MAX693AMJE has an adjustable supply monitor which is used to detect power voltages that are either too low or too high. When a voltage falls below the lower threshold or rises above the upper threshold an active-LOW reset output is triggered, resetting the system. The width of the active-LOW reset pulse is typically kept between 100µs - 400µs.

The watchdog timer is designed to reset the system if it fails to generate a system reset signal at a regular interval. The timeout period is adjustable between two seconds and one minute in two second intervals. The MAX693AMJE includes an active-HIGH output driver which is used to provide a reset signal when the system is powered up or reset by the supply monitor or watchdog timer.

Conclusion

The MAX693AMJE is a versatile supervisor ideal for powering digital systems and protecting system components from abnormal power-down scenarios. Its wide operating range, adjustable thresholds and configurable watchdog timer make it suitable for use as a circuit supervisor in a wide range of applications.

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