AS1901C31

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AS1901C31 is a microprocessor supervisory circuit that monitors DC power supplies. It provides a simple and reliable solution that helps to ensure stable operation of microprocessors, DRAMs, and similar logic circuitry. The device is ideally suited for use in battery-backed-up systems, and in any other situation where single- or multi-supply monitoring of microprocessors is required.

The AS1901C31 consists of an adjustable voltage monitor (AVM) with a wide monitoring range (1.15–2.9 V) and a multi-output reset generator (RG). The AVM has two thresholds, an active-high reset threshold (V_RESETH) and an active-low reset threshold (V_RESETL). When the monitored supply voltage drops below the V_RESETL level, the device initiates a reset signal. If the voltage rises above V_RESETH, the reset signal is deactivated. The RG can also generate both synchronous and asynchronous demands for reset.

The AS1901C31 is designed for a wide range of applications, with features that include a wide monitoring voltage, integrated reset termination, and very low quiescent current. The device can be used to monitor both single- and multi-voltage supplies, and also includes an adjustable reset output delay and a power-good signal. In addition, the device is capable of directly monitoring multiple supplies or an unregulated bus voltage.

The AS1901C31 can be used in a variety of applications, including microprocessor-based systems, power-management applications, and any circuit that requires the detection of changes in voltage levels. The device operates by monitoring the voltage and generating an active-high reset signal when it drops below a preset threshold. After the reset is activated, the reset generator can be configured to release the reset signal when the voltage has risen above a specified threshold.

The AS1901C31 also incorporates a power-good (PG) signal, which is active when the monitored voltage is within the acceptable operating range. This feature can be used to indicate when the power supply is stable. The device also includes an adjustable reset output delay, which delays the onset of the reset to eliminate false triggers. This feature can be used to ensure that the reset is correctly triggered only when the power supply has dropped below a certain value.

Overall, the AS1901C31 is a versatile and reliable microprocessor supervisory circuit, designed to provide reliable monitoring and reset control for DC power supplies. The device features an adjustable voltage monitor, a multi-output reset generator, an adjustable reset delay and a power-good detect signal. This makes it ideal for use with microprocessors, DRAMs, and similar logic circuitry, providing improved protection for these devices in a wide range of applications.

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