STM819LDS6E

Supervisors Overview

The STM819LDS6E is a 5 V supervisor with battery switchover, part of the STM690A/692A/703/704/802/805/817/818/819 family. It provides microprocessor supervisory functions and can non-volatize and write-protect external LPSRAM. A precision voltage reference and comparator monitors the VCC input for out-of-tolerance conditions, forcing the reset output low when invalid. Unlike other family members, it lacks a watchdog timer but includes a power-fail comparator. It operates from -40 °C to +85 °C in an 8-pin SOIC package.

Supervisors Feature Summary

• Provides automatic battery switchover capabilities
• Includes power-fail comparator for early warning of impending power failure
• Capable of non-volatizing and write-protecting external LPSRAM

Supervisors Applications

• Microprocessor system supervision
• External LPSRAM protection
• Battery-powered systems requiring switchover

Supervisors Procurement Notes

Verify the specific suffix 'DS6E' against official STMicroelectronics documentation to confirm package type (SOIC) and RoHS compliance status. Ensure the absence of a watchdog timer aligns with system requirements, as this model differs from similar parts like the STM818 which includes one. Cross-reference the exact part number with current datasheets to avoid confusion with variants that may have different electrical characteristics or pinouts.

Supervisors Selection Notes

Select this component when a dedicated watchdog timer is unnecessary but power-fail detection and NVRAM protection are required. It is suitable for industrial applications operating between -40 °C and +85 °C. Consider alternatives within the same family if a watchdog timer or chip-enable gating is needed instead of the power-fail comparator features provided here.

Supervisors Part Context

This device belongs to a series of self-contained supervisors designed for 5 V systems. The family shares common features like low supply current and guaranteed reset assertion down to 1.0 V. Variations within the group include differences in watchdog presence and chip-enable gating, allowing designers to choose based on specific supervisory needs without changing the core interface or package form factor significantly.

Supervisors Replacement Considerations

Direct substitutes within the same family include STM817LDS6E and STM818LDS6E, though functional differences exist regarding watchdog timers and chip-enable gating. Verify compatibility carefully as these internal feature variations impact system behavior during fault conditions.