DS1831A

Supervisors Overview

The DS1831A is a multisupply Micromonitor supervisory circuit designed for systems with multiple power rails. It monitors four voltage inputs: a fixed 5V supply, a fixed 3.3V (or 3V) supply, and two additional user-configurable channels via referenced comparators. The device generates active-low open-drain reset signals when monitored voltages fall below their respective thresholds. Internal circuitry draws operating power from the higher of the 5V or 3.3V inputs, requiring at least one input to exceed 1V. Key features include a manual pushbutton reset override, a watchdog timer for software monitoring, and configurable reset delay times of 10ms, 100ms, or 1s. It operates within an extended temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Monitors up to four system voltages including dedicated 5V and 3.3V rails plus two configurable inputs
• Integrates a watchdog timer for continuous software execution verification
• Provides manual pushbutton reset capability for system override functions
• Configurable reset delay durations allow adaptation to specific transient requirements

Supervisors Applications

• Embedded systems requiring supervision of multiple independent power supplies
• Microprocessor-based designs needing reliable power-on reset sequencing
• Industrial control units operating in extended environmental temperature ranges
• Equipment utilizing watchdog timers for fault detection and recovery

Supervisors Procurement Notes

Verify component authenticity through authorized distribution channels due to limited availability status. Confirm package variant compatibility, as DIP-16 and SOIC-16 options exist within the family. Check RoHS compliance documentation carefully, as historical manufacturing data indicates variations between leaded and lead-free versions. Ensure design-in specifications match the exact threshold tolerances and current consumption requirements before finalizing procurement orders.

Supervisors Selection Notes

Select this component when simultaneous supervision of five-volt and three-point-three-volt rails is required alongside custom voltage monitoring. The integrated watchdog functionality distinguishes it from basic voltage supervisors. Consider the PDIP-16 package for through-hole assembly or SOIC-16 for surface mount applications. Verify that the internal power sourcing mechanism aligns with the target system's power-up sequence to ensure proper initialization.

Supervisors Part Context

This device belongs to the Maxim Integrated MicroMonitor series, which specializes in compact supervisory circuits for multi-supply environments. The DS1831A specifically addresses applications where standard single-channel monitors are insufficient. It complements other Maxim power management solutions by providing robust hardware-level protection against brown-out conditions and software hangs without requiring external discrete components.

Supervisors Replacement Considerations

DS1831C serves as a pin-compatible alternative offering different fixed threshold configurations. DS1831D provides similar functionality with potentially updated manufacturing processes. Verify electrical parameter alignment, particularly regarding reset delay options and comparator sensitivity, before substituting these variants in existing designs.