MAX6347XR42-T

Overview

The MAX6347XR42-T is a microprocessor supervisory circuit manufactured by Analog Devices Inc. (Maxim Integrated). It monitors a single power-supply voltage and asserts an active-high, push-pull reset signal when the supply drops below a preset threshold. The device features ultra-low supply current of 1µA maximum, making it suitable for portable applications. It provides a minimum power-on reset pulse width of 100ms. The component operates within a supply voltage range down to 1V and is specified over a temperature range of -40°C to +85°C. It is housed in a space-saving SC-70-3 package.

Feature Summary

• Active-high push-pull reset output configuration
• Ultra-low 1µA maximum supply current
• Factory-trimmed reset thresholds from 2.2V to 4.63V
• Minimum 100ms power-on reset pulse width

Applications

• Microprocessor system supervision
• Portable digital equipment power monitoring
• Battery-powered circuit protection

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging. Confirm the 'XR42' designation corresponds to the required 4.2V threshold voltage. Check current availability status as older Maxim parts may have limited stock or obsolescence risks. Ensure the active-high output aligns with the target controller's reset input requirements.

Selection Notes

Select this part if an active-high reset signal is required, distinguishing it from the open-drain MAX6348 variants. Verify that the 4.2V threshold matches the monitored rail's nominal voltage. Consider the SC-70-3 package size constraints. Ensure the 100ms minimum delay meets the system's startup timing requirements.

Part Context

The MAX6347 belongs to the MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 family of ultra-low-power voltage detectors. These devices eliminate external components by using internally trimmed resistor networks. The MAX6347 specifically offers an active-high push-pull output, whereas other family members provide active-low outputs in either push-pull or open-drain configurations.

Replacement Considerations

MAX6347XR42+T: Lead-free version of the same electrical specification. MAX6347UR37-T: Different threshold voltage (3.7V) but identical output type. MAX6348XR42-T: Open-drain output variant; requires pull-up resistor modification.