DS1238S-5

Supervisors Overview

The DS1238S-5 is a MicroManager supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated, designed to monitor power supply voltages and manage system resets. It integrates a watchdog timer, battery backup switch, and manual reset functionality within a single package. The device operates with a threshold voltage of 4.37V and supports a minimum operating temperature of 0°C up to a maximum of +70°C. It features a reset delay time of at least 40 ms and consumes less than 200 nA in battery standby mode. The component is available in a 16-SOIC surface-mount package.

Supervisors Feature Summary

• Holds microprocessor in check during power transients
• Converts CMOS SRAM into nonvolatile memory via battery backup
• Unconditionally write-protects memory when power supply is out of tolerance
• Debounces pushbutton reset for reliable manual intervention

Supervisors Applications

• Microprocessor applications requiring orderly shutdown
• Systems needing conversion of CMOS SRAM to nonvolatile memory
• High current applications controlled by external power switches

Supervisors Procurement Notes

Verify the specific suffix against official datasheets to confirm pinout and electrical characteristics, as variations exist within the family. Confirm availability status, as this component may be discontinued or subject to limited distribution channels. Ensure compatibility with existing PCB footprints and thermal requirements before finalizing procurement decisions.

Supervisors Selection Notes

Select this component when precise power monitoring and integrated nonvolatile memory control are required. The 10% monitoring accuracy suits general industrial applications. Consider the 16-SOIC package for space-constrained designs. Verify that the operating temperature range meets environmental specifications. Compare against the standard DS1238 variant if higher precision is not needed.

Supervisors Part Context

This part belongs to the DS1238A series of MicroManager circuits from Maxim Integrated. It is functionally similar to the MAX691 but offers enhanced integration. The 'S' indicates a SOIC package, while '-5' denotes the 10% monitoring accuracy version. It serves as a comprehensive solution for power management and data retention in embedded systems.

Supervisors Replacement Considerations

The DS1238S-5 is pin-for-pin compatible with the MAX691. Verify functional equivalence regarding reset timing and battery backup switching before substitution. Check for any differences in package dimensions or thermal performance between the original and replacement parts.