MAX1232MJA/883B

Supervisors Overview

The MAX1232MJA/883B is a military-grade microprocessor supervisory circuit designed for high-reliability applications. It provides power-supply supervision, software execution monitoring via a watchdog timer, and manual reset functionality. The device operates within a supply voltage range up to 5.5V with threshold options of 4.5V or 4.75V. It features an adjustable watchdog timer with delays of 150ms, 600ms, or 1.2s, and a minimum power-ok/reset pulse width of 250ms. Operating temperatures span from -55°C to +125°C in a CDIP-8 package.

Supervisors Feature Summary

• Provides comprehensive microprocessor housekeeping including power monitoring and software execution verification
• Features an adjustable watchdog timer to detect software malfunctions and trigger system recovery
• Includes a debounced manual reset input allowing for external override of the reset state
• Delivers precision voltage monitoring with selectable thresholds for critical power supervision

Supervisors Applications

• Critical microprocessor power monitoring in aerospace systems
• Military-grade computer and controller architectures
• Intelligent instruments requiring high reliability and extended temperature operation

Supervisors Procurement Notes

Verify that the specific suffix /883B confirms compliance with MIL-PRF-38534 or equivalent military standards, as this denotes the qualified version. Confirm availability status directly with Analog Devices or authorized distributors, as restricted supply conditions may apply. Ensure the CDIP-8 through-hole package matches the target PCB footprint requirements before finalizing procurement orders.

Supervisors Selection Notes

Select this component when designing systems that require radiation-hardened or military-specified supervisory circuits with extended temperature ranges. It serves as a direct functional upgrade to the commercial DS1232, offering significantly lower power consumption while maintaining similar supervision capabilities. Consider the available watchdog timer settings and reset pulse widths to ensure compatibility with the target microprocessor's timing requirements.

Supervisors Part Context

This part belongs to the MAX1232 series of microprocessor monitors, which are engineered to enhance circuit reliability by monitoring power supplies and software execution. The MAX1232 family is designed to consume approximately one-tenth the power of the legacy DS1232 devices. It integrates essential supervision functions without requiring external components, making it suitable for space-constrained and power-sensitive embedded designs.

Supervisors Replacement Considerations

The MAX1232MJA/883B is documented as a plug-in upgrade for the Dallas DS1232. Verify pinout compatibility and electrical specifications against the original design requirements before substitution.