Maxim Integrated MAX922CUA-T Microprocessor Supervisory Circuits

The MAX922CUA-T from Maxim Integrated is a precision, dual-voltage microprocessor (µP) supervisory circuit that provides an essential interface and power management solution for digital systems. This compact device is designed to monitor power supplies in µP and digital systems, providing a significant boost in system reliability and performance. Its primary function is to ensure that the µP starts up in a predictable state and to protect the system from unpredictable events such as brownouts or power failures.

Encased in a space-efficient 8-pin µMAX package, the MAX922CUA-T is suitable for a wide range of applications, including computers, controllers, intelligent instruments, and critical µP power monitoring. This component is particularly useful in systems that require low-power operation and minimal space usage.

Key features of the MAX922CUA-T include:

• Independent watchdog timer to reset a µP if it fails to strobe within a preset time frame.
• Manual reset input for triggering a system reset from an external source.
• Low supply current of 12µA, which is ideal for power-sensitive applications.
• Two voltage detector inputs for monitoring different voltage levels within the system.
• Guaranteed reset output to VCC down to 1.0V, ensuring reliable operation during low voltage conditions.
• Wide operating temperature range from -40°C to +85°C, accommodating harsh environments and ensuring versatility across various applications.

The MAX922CUA-T offers a reset threshold voltage of 4.65V for the primary voltage detector and a 1.20V threshold for the secondary detector, with a reset timeout period of 200ms, ensuring that the system has adequate time to stabilize before resuming operation. This device is available in tape and reel packaging, making it suitable for automated assembly processes and large-scale production.

With its robust feature set, the MAX922CUA-T is an ideal choice for designers seeking to enhance system reliability and safeguard against power-related issues in their digital applications.