MAX818LCSA+

Supervisors Overview

The MAX818LCSA+ is a microprocessor supervisory circuit designed for +5V systems, manufactured by Analog Devices Inc./Maxim Integrated. It monitors a single voltage input with a threshold of 4.65 V and an overvoltage threshold of 4.75 V. The device features an active-low open-drain output and includes a watchdog timer and backup-battery switchover functionality. It operates within a supply voltage range up to 5.5 V, consumes 11 µA of supply current, and provides a reset delay time of 200 ms. The component is housed in an 8-UMAX package and supports surface-mount installation.

Supervisors Feature Summary

• Integrates watchdog timer and battery backup switchover for comprehensive system protection
• Features active-low open-drain reset output for direct microprocessor interfacing
• Designed to ignore fast transients on the power supply rail

Supervisors Applications

• +5V-powered microprocessor systems
• Portable applications requiring low supply current
• Battery-controlled systems with backup switchover needs

Supervisors Procurement Notes

Verify availability status as distribution channels may indicate limited stock or restricted sales regions. Confirm the specific suffix 'C' corresponds to the commercial temperature range (0°C to +70°C) and the 'S' indicates the SOIC-style UMAX package. Ensure compatibility with existing board layouts for the 8-pin surface-mount form factor before finalizing procurement orders.

Supervisors Selection Notes

Select this component when a dedicated watchdog timer and battery backup function are required alongside voltage monitoring. The 4.65 V threshold is optimized for standard +5V logic systems. Consider the 11 µA quiescent current for battery-operated designs. Verify that the open-drain output configuration aligns with the target microprocessor's reset input requirements.

Supervisors Part Context

The MAX818LCSA+ belongs to the MAX817/MAX818/MAX819 family of microprocessor supervisory circuits. This series simplifies power-supply monitoring and chip-enable gating by reducing external component counts. These devices are specifically engineered for +5V systems and offer low supply current consumption suitable for portable electronics.

Supervisors Replacement Considerations

Cross-reference with MAX818LCUA+ for alternative packaging options within the same functional family.