MAX804SCPA+

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System supervisors exist to monitor and control system behavior. They provide protection for the system by detecting a variety of fault conditions, including power supply and clock failure, over temperature situations and out of tolerance processor signals. The MAX804SCPA+ product falls into this category of components.

The MAX804SCPA+ is a low-power system supervisor with integrated precision voltage monitoring. It is a highly integrated and small size solution tailored for the protection needs of today’s microprocessors and other system components, such as SRAM and FPGAs. Its operating range is from +2.2V to +5.5V and is able to detect supply voltage down to +1.6V.

The MAX804SCPA+ monitors VCC supply voltage, provide power-good indication, reset generators, voltage hysteresis and includes status outputs to indicate the power supply and reset conditions. Additionally, it contains two independent digital low voltage detectors with adjustable sensitivities to indicate low voltage conditions for two power rails, for example, for secondary power rails of processors or other system powered processors.

The MAX804SCPA+ continuously monitors its supply voltage for proper operating range and issues a Power-Good signal when the voltage is within limits. The device provides two independent monitor outputs, RESET and VOUT, to indicate the condition of its supply voltage.

When the input voltage is below its reset threshold, the RESET signal is asserted and all its outputs are set to low. As long as the input voltage exceeds the reset threshold, the RESET pin is released. The VOUT signal is also active when the input voltage is above its alert threshold.

The MAX804SCPA+ provides typical voltage reset thresholds for microprocessors and other components, such as SRAM and FPGAs. It also has a programmable reset timeout feature which means that the MAX804SCPA+ will hold the reset line active for a minimal amount of time, even if the compatible voltage goes below the reset threshold within that time. This feature helps prevent false resets.

In addition to the reset pins, the MAX804SCPA+ has two digital logic outputs that indicate low voltage conditions for two power rails. The output logic is inverting and the voltage thresholds are user adjustable. The low voltage detector is typically used to indicate system power failure or low power levels in secondary power rails of processors or other system powered devices.

The MAX804SCPA+ is only active when the supply voltage is above its minimum operating voltage, which is typically 2.2V. If the supply voltage drops below this level, the device will be disabled and all its outputs will assume their active low states. This feature helps prevent false resets in the event of low power conditions.

In summary, the MAX804SCPA+ is a highly integrated, low-power system supervisor tailored for the protection needs of today’s microprocessors and other system components. It features integrated precision voltage monitoring, reset generators, voltage hysteresis and two independent digital low voltage detectors with adjustable sensitivities. Its typical voltage reset thresholds make protection and monitoring of the system components easy. Its wide operating range and low quiescent current make it an ideal choice for portable applications.

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