MAX818LCUA

Supervisors Overview

The MAX818LCUA+ is a voltage supervisory circuit designed for +5V microprocessor systems. It features a threshold voltage of 4.65 V and an overvoltage threshold of 4.75 V, with a reset delay time of 200 ms. The device operates within a supply voltage range up to 5.5 V and consumes a typical working power current of 11 uA. It provides active low open-drain output and includes manual reset capability. The component supports watchdog timer functions and battery backup switchover. It is housed in an UMAX-8 package and operates between 0°C and +70°C.

Supervisors Feature Summary

• Integrates watchdog timer functionality for system reliability monitoring
• Supports battery backup switchover for continuous operation during power transitions
• Features active-low open-drain reset output compatible with various logic families

Supervisors Applications

• +5V-powered microprocessor system supervision
• Portable applications requiring low standby current
• Battery-operated devices needing backup switchover management

Supervisors Procurement Notes

Verify the specific suffix 'L' indicates the industrial temperature grade and performance characteristics. Confirm the 'U' denotes the UMAX-8 package style. Ensure the '+' suffix confirms RoHS compliance status as per the manufacturer's latest documentation before finalizing procurement specifications.

Supervisors Selection Notes

Select this component when a low-power supervisory circuit with integrated watchdog and battery backup capabilities is required for +5V systems. The UMAX-8 package suits space-constrained designs. Verify that the 4.65 V threshold aligns with the target supply voltage requirements and that the active-low output polarity matches the microprocessor reset input configuration.

Supervisors Part Context

Part of the MAX817/MAX818/MAX819 family of microprocessor supervisory circuits. These devices simplify power-supply monitoring and chip-enable gating by reducing component count. They are specifically designed to ignore fast transients on VCC, making them suitable for noisy environments common in portable and industrial electronics.

Supervisors Replacement Considerations

Check for MAX818LCUA+ equivalents from Analog Devices. Verify pinout compatibility and electrical parameter alignment, particularly threshold voltages and package dimensions, before substituting.